CN106694225A - Device for removing fine particulate matter of sintering flue gas by pulse corona charge - Google Patents

Abstract

The invention discloses a device for removing fine particles of sintering flue gas by pulsed corona charging, which belongs to the technical field of pollutant removal in sintering process. The invention includes a pulse charging unit, an agglomeration unit and a trapping unit, and the pulse charging unit, the agglomeration unit and the trapping unit are sequentially arranged in the gas pipeline along the flow direction of the flue gas, and the pulse corona electrode of the pulse charging unit passes through The pulse discharge makes the particles charged; the agglomeration unit includes a positively charged droplet spraying mechanism and a negatively charged droplet spraying mechanism. The positively charged droplet spraying mechanism or the negatively charged droplet spraying mechanism is used to spray positively charged or The charged agglomerating agent droplets, the agglomerating agent droplets are agglomerated with the charged particles; the trapping unit is used to capture the agglomerated particles. The fine particles are charged by the pulse corona, and the agglomeration unit is sprayed with a charged agglomerating agent to strengthen the agglomeration effect of the particles and improve the agglomeration and removal efficiency of the fine particles.

Description

A device for removing fine particles from sintering flue gas by pulsed corona charging

technical field

The invention belongs to the technical field of pollutant removal in sintering process, and more specifically relates to a device for removing fine particles of sintering flue gas by pulse corona charging.

Background technique

Fine particulate matter pollution is now a serious environmental problem in our country, seriously affecting people's life and health. At present, the main particles in the iron and steel metallurgy industry mainly come from the iron ore sintering process. The iron ore sintering process is an indispensable link in the modern iron and steel production process, and it is also the largest PM ₁₀ and PM _2.5 emission source in the iron and steel industry. After that, the annual emission of particulate matter exceeds 1 million tons, accounting for about 40% of its total emissions. At present, the sintering plant mainly uses electrostatic precipitators to purify the particulate matter in the sintering flue gas. The electrostatic precipitator has a better effect _on removing _coarse particles in the flue gas. Its specific resistance is high, its charging capacity is poor, and the dust removal efficiency is significantly reduced. After the sintering flue gas undergoes electrostatic dust removal, more than 90% of the particulate matter in the flue gas is PM ₁₀ , and more than 80% of the particulate matter is PM _2.5 . Traditional dust removal methods are difficult to effectively control the emission of fine particles in the sintering flue gas. It is urgent to develop a device for removing the fine particles of sintering flue gas, so as to effectively treat the fine particles in the sintering flue gas.

After searching, for example: Chinese patent application number: 201310381190.1, the date of authorization announcement was February 4, 2015, the invention name is the method of electric dust removal, water mist charge coagulation and capture of PM _2.5 fine particles. The application discloses a The method of electrostatic precipitating water mist charging and coagulation and capturing PM _2.5 fine particles is characterized in that the electrostatic precipitating part and the liquid atomization part, the atomized liquid droplets are corona charged in the electric field, so that the droplets are charged and charged. The electric liquid droplets collide with the fine particles, coagulate and agglomerate the fine particles, and transfer the charge to the fine particles to improve the charging performance of the particles. _2.5 A device for fine particles, including an electrostatic dust removal part and a two-fluid jet atomization part, and the two-fluid jet atomization part includes an air supply pipeline, a water supply pipeline and a nozzle. Its disadvantages are that the charging efficiency of PM _2.5 is not high, the removal efficiency is poor, and the device structure is complex and large.

In addition, such as: Chinese patent application number: 201620055887.9, the date of authorization announcement is June 29, 2016, the name of the invention is a flue gas dust removal system, the application discloses a flue gas dust removal system, the dust removal system includes gravity Settling chamber, inertial dust removal device, cyclone dust removal device and wet electrostatic precipitator; the inertial dust removal device is set in the gravity settling chamber and is located at the flue gas outlet end of the gravity settling chamber, and the flue gas outlet end of the gravity settling chamber is connected to the flue gas of the cyclone dust removal device. The gas inlet ends are connected; the wet electrostatic precipitator is set at the flue gas outlet end of the cyclone dust removal device. Compared with the existing wet electrostatic precipitator, this application improves the dust removal efficiency to a certain extent, but its disadvantages are that there are many types of dust removal equipment, large pressure loss and high energy consumption.

Contents of the invention

1. The technical problem to be solved by the invention

Aiming at the problem that the existing dust removal method has limited processing effect on fine particles in flue gas and it is difficult to effectively control the discharge of fine particles in sintering flue gas, the present invention provides a pulse corona charging method for removing fine particles in sintering flue gas The device uses pulsed corona to charge the fine particles, and spraying the charged agglomerating agent into the agglomeration unit can strengthen the agglomeration effect of the particles, improve the agglomeration and removal efficiency of the fine particles, and control the emission of fine particles in the sintering flue gas.

2. Technical solution

In order to achieve the above object, the technical scheme provided by the invention is:

A device for removing fine particulate matter from sintering flue gas by pulse corona charging of the present invention comprises a pulse charging unit, the pulse charging unit is provided with a pulse corona electrode, and the pulse corona electrode charges the particles through pulse discharge ; The agglomeration unit, the agglomeration unit includes a positively charged droplet spraying mechanism and a negatively charged droplet spraying mechanism. Agent mist droplets, agglomeration agent mist droplets and charged particles agglomerate; capture unit, the capture unit is used to capture the agglomerated particles; the pulse charging unit, agglomeration unit and capture unit The flow direction of the gas is sequentially set in the gas pipeline.

Preferably, the positive charge spraying mechanism includes a positive corona atomization nozzle, a positive corona electrode and a positive corona power supply, and the nozzle of the positive corona atomization nozzle is arranged in the flue gas pipeline, The positive corona electrode is arranged in the positive corona atomizing nozzle, and the positive corona electrode is connected with the positive corona power supply.

Preferably, the negatively charged droplet spraying mechanism includes a negative corona atomizing nozzle, a negative corona electrode and a negative corona power supply, the nozzle two of the negative corona atomizing nozzle is arranged in the flue gas pipeline, and the negative corona electrode is arranged In the negative corona atomizing nozzle, the negative corona electrode is connected with the negative corona power supply.

Preferably, the pulse power source used for the pulse corona electrode has a frequency of 150-250 Hz and a voltage of 50-110 kV.

Preferably, the gas pipeline is a removal pipeline, the diameter of which is larger than that of the flue gas pipeline, and the inlet end of the removal pipeline is connected to the flue gas pipeline through an expansion tube.

Preferably, a pretreatment unit is also included, and the pretreatment unit is used to spray agglomerating agent or mist of water or salt solution into the flue gas.

Preferably, the droplet size of the agglomerating agent or water or salt solution sprayed into the pretreatment unit is 0.2-3 μm.

Preferably, the pretreatment unit is arranged at the pipe axis of the expansion pipe.

Preferably, the pretreatment unit includes a pretreatment nozzle and a flow guide part, wherein the flow guide part is arranged on the upwind side of the pretreatment nozzle, and the pretreatment nozzle is used to spray the mist of agglomerating agent or water or salt solution into the pipeline .

3. Beneficial effect

Compared with the prior art, the technical solution provided by the invention has the following beneficial effects:

(1) A device for removing fine particles from sintering flue gas by pulse corona charging according to the present invention. The corona charges the fine particles, and the agglomeration unit is sprayed with a charged agglomerating agent to strengthen the agglomeration effect of the particles, improve the agglomeration and removal efficiency of the fine particles, and effectively control the emission of fine particles in the sintering flue gas;

(2) A kind of pulse corona charge of the present invention removes the device of sintering flue gas fine particle matter, when the pretreatment nozzle pipe of pretreatment unit is sprayed into the mist droplet of water in flue gas, through mist droplet particle and fine particle matter The combination of particles with medium particle size, particles and water combine to form a mixture of larger particles and water or form a coating layer on the surface of particles, increasing the particle size of particles, making particles avoid the medium particle size and reducing the size of the medium particle size. The proportion of fine particles in the diameter range, which in turn strengthens the charging effect of medium-sized particles, thereby promoting the agglomeration and growth of fine particles, and improving the removal efficiency of fine particles.

Description of drawings

Fig. 1 is the structural representation of embodiment 1 of the present invention;

Fig. 2 is the structural representation of embodiment 2 of the present invention;

Fig. 3 is the structural representation of embodiment 3 of the present invention;

Fig. 4 is a schematic structural view of the flow guide part disposed on the expansion tube in Embodiment 3 of the present invention;

Fig. 5 is a schematic structural diagram of Embodiment 4 of the present invention.

Explanation of the labels in the schematic diagram:

100. Pulse charging unit; 110. Pulse corona electrode;

200. Reunion unit; 210. Positively charged droplet spraying mechanism; 211. Positively charged atomizing nozzle; 212. Positively corona electrode; 213. Positively corona power supply; 214. Nozzle one; 220. Negatively charged droplet spraying mechanism ; 221, negative corona atomizing nozzle; 222, negative corona electrode; 223, negative corona power supply; 224, nozzle two; 230, corona power supply;

300, capture unit; 310, capture electrode; 312, capture positive electrode; 313, capture negative electrode; 320, collector;

400. Pretreatment unit; 410. Pretreatment nozzle; 420. Guide component; 421. First guide block; 422. Second guide block;

500, removal pipe; 510, expansion pipe; 520, shrinkage pipe; 530, baffle;

600. Flue gas pipeline.

detailed description

The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and in which is shown by way of example an exemplary embodiment of the invention in which it can be practiced. While these exemplary embodiments have been described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments can be implemented and that various changes can be made in the invention without departing from the spirit and scope of the invention. . The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention as claimed, but merely to illustrate and not limit the description of the features and characteristics of the invention, in order to suggest the best mode of carrying out the invention , and are sufficient to enable those skilled in the art to implement the present invention. Accordingly, the scope of the invention is to be limited only by the appended claims.

The following detailed description and example embodiments of the invention may be better understood when taken in conjunction with the accompanying drawings, in which elements and features of the invention are identified by reference numerals.

Example 1

As shown in Figure 1, a device for removing fine particles in iron ore sintering flue gas by pulse corona discharge in this embodiment includes a pulse charging unit 100, an agglomeration unit 200 and a trapping unit 300; the pulse charging unit 100, The agglomeration unit 200 and the capture unit 300 are sequentially arranged in the gas pipeline along the flow direction of the flue gas, wherein the gas pipeline is a removal pipeline 500, and the diameter of the removal pipeline 500 is larger than the diameter of the flue gas pipeline 600, so The inlet end of the removal pipeline 500 is connected to the flue gas pipeline 600 through the expansion tube 510, and the gas outlet end of the removal pipeline 500 is connected to the flue gas pipeline 600 through the shrink tube 520, that is, the removal pipeline 500 is installed in the flue gas pipeline in series 600, the flue gas enters the removal pipe 500 from the expansion pipe 510, and enters the flue gas pipe 600 through the shrinkage pipe 520 after agglomeration. Since the diameter of the removal pipe 500 is larger than the diameter of the flue gas pipe 600, the removal pipe is reduced. The flue gas flow rate in 500 increases the time of emission reduction reunion and improves the emission reduction effect.

The pulse charging unit 100 of this embodiment is provided with a pulse corona electrode 110, and the pulse corona electrode 110 makes the particles have opposite charges through pulse discharge; the pulse corona electrode 110 is provided with three rows to enhance the charging efficiency, and The frequency of the pulse power used by the pulsed corona electrode 110 is 150-250 Hz, preferably 200 Hz in this embodiment, and the voltage is 50-110 kV, preferably 80 kV in this embodiment; the pulsed corona electrode 110 makes particles with opposite charges through pulse discharge.

The reason is that in the high-voltage pulse corona environment, there may be two charging mechanisms: diffusion charging and electric field charging. Under the joint action of the two charging mechanisms, the particles will be positively or negatively charged. And the applicant is surprised to find that when the particle size is different, the diffusion charge and the electric field charge will show different leading effects, that is, when the particle size is small, the diffusion charge plays a leading role and makes the particle positively charged. When the particle size is large, the electric field charge plays a leading role, and makes the particles negatively charged, and the positively charged particles and negatively charged particles are attracted and gathered together under the action of the electron Coulomb force, thus strengthening the agglomeration of the particles. big.

After the particles with opposite charges are attracted and nucleated by themselves, they further enter the agglomeration unit 200; the agglomeration unit 200 is arranged on the downwind side of the flue gas flow direction of the pulse charging unit 100, and the agglomeration unit 200 includes a positively charged droplet spraying mechanism 210 and The negatively charged droplet spraying mechanism 220, the positively charged droplet spraying mechanism 210 or the negatively charged droplet spraying mechanism 220 are used to spray positively or negatively charged agglomerating agent droplets into the flue gas. Charged particles agglomerate. The positively charged droplet spraying mechanism 210 is arranged on the windward side of the negatively charged droplet spraying mechanism 220 , that is, the flue gas first passes through the positively charged droplet spraying mechanism 210 and then moves to the negatively charged droplet spraying mechanism 220 .

Wherein, it is worth noting that: the positive charge droplet spraying mechanism 210 includes a positive corona atomizing nozzle 211, a positive corona electrode 212 and a positive corona power supply 213, and the positive corona electrode 212 is connected with the positive corona power supply 213 , the positive corona electrode 212 is arranged at the inlet of the positive corona atomization nozzle 211, and the positive corona electrode 212 makes the agglomerating agent in the positive corona atomization nozzle 211 carry positive charges by discharging, and the positive corona atomization The outlet end of nozzle 211 is provided with nozzle one 214, and this nozzle one 214 is arranged on and removes in pipeline 500, and nozzle one 214 is used for spraying into positively charged mist droplet in removing pipeline 500, and the injection of nozzle one 214 The direction is opposite to the direction of flue gas flow, and the chance of contact between the fine particles in the flue gas and the agglomerating agent droplets sprayed from the agglomerating agent nozzle increases. After being treated by the pulse corona electrode 110, the negatively charged fine particles attract the positively charged droplets under the action of Coulomb force, and the agglomerating agent droplets gather together with the negatively charged fine particles, and then the charge in the particles The charges in the agglomerating agent are neutralized with each other. After the particles and the agglomerating agent are aggregated together, under the binding action of the agglomerating agent, the agglomerating agent binds the particles together and agglomerates and grows. The fine particles are attracted by the charge to promote The combination efficiency with the agglomerating agent improves the agglomeration effect of fine particles.

Negative charge droplet spraying mechanism 220 comprises negative corona atomization nozzle 221, negative corona electrode 222 and negative corona power supply 223, and this negative corona electrode 222 is connected with negative corona power supply 223, and negative corona electrode 222 is arranged on negative corona atomization nozzle 221 At the inlet of the negative corona electrode 222, the agglomerating agent of the negative corona atomizing nozzle 221 carries a negative charge by discharging. The outlet end of the negative corona atomization nozzle 221 is provided with a nozzle two 224, and the nozzle two 224 is arranged in the removal pipeline 500, and the nozzle two 224 is used to spray negatively charged droplets into the removal pipeline 500; and the nozzle two 224 The injection direction is opposite to the direction of flue gas flow. Similarly, after being treated by the pulsed corona electrode 110, some particles carry positive charges, that is, some particles have positive charges; of course, the fine particles treated by the positively charged droplet spraying mechanism 210, the fine particles and the positively charged mist When the droplets combine, they may exhibit positively charged characteristics. The positively charged fine particles or the positively charged agglomerated particles combined with the agglomerating agent attract the negatively charged droplets under the action of Coulomb force. Under the action of binding, the agglomerating agent continues to bind the particles together, which promotes the combination efficiency of the fine particles and the agglomerating agent through charge attraction, and improves the agglomeration effect of the fine particles.

After being treated by the pulsed corona electrode 110, the particles are positively or negatively charged. The agglomerating agent with electric charge, the particles and the agglomerating agent with dissimilarity attract each other and gather together. Under the bonding action of the agglomerating agent, the aggregated particles will continuously collide and bond and grow up, promoting the particle Agglomerates and grows to form larger particles.

When the fine particles in the flue gas pass through the pulse charging unit 100 and the agglomeration unit 200 sequentially, after the fine particles are charged in the pulse charging unit 100, the particles of different particle sizes have opposite charges after charging, and the opposite charges Driven by the charge, the particles attract each other and form an agglomeration core, then the positively charged mist spray mechanism 210 sprays positively charged mist into the removal pipeline 500, and under the action of the positively charged agglomerating agent mist, the particles further The combination and agglomeration begin to grow; then the negatively charged droplet spraying mechanism 220 sprays negatively charged droplet into the removal pipeline 500, and the negatively charged agglomerating agent droplet further combines with positively charged particles or aggregates, and further Grow up to provide guarantee for subsequent capture.

The above-mentioned trapping unit 300 is used for trapping the aggregated particulate matter; the trapping unit 300 includes a trapping electrode 310 and a collector 320, the agglomerated particulate matter passes through the trapping electrode 310, and the particulate matter captured by the trapping electrode 310 , the collecting electrode 310 is provided with a vibrating device, and the vibrating device is shaken off or discharged into the collector 320 during the vibration process, and is collected by the collector 320. An open valve is provided at the bottom of the collector 320, and the open valve is used for discharging particulates. When the collector 320 collects a certain amount, the opening valve is opened to discharge the collected particles. The capture unit 300 is used to capture the aggregated particles and collect the captured particle agglomerates; the pulse charging unit 100, the agglomeration unit 200 and the capture unit 300 are sequentially arranged in the removal pipeline along the flow direction of the flue gas In 500, from the windward side to the downwind side of the flue gas flow, a pulse charging unit 100, an agglomeration unit 200 and a trapping unit 300 are arranged in sequence; Enhanced electrostatic capture effect on PM _2.5 and PM ₁₀ . The agglomerating agent of this embodiment is an aqueous solution of sodium carboxymethylcellulose (CMC), and the mass concentration of the solution is 0.02%.

The emission reduction effect of fine particulate matter by using the removal device is as follows, wherein: PM10 emission reduction efficiency (%) is: 44.1%, PM2.5 emission reduction efficiency (%): 28.3%. Improve the emission reduction effect of fine particulate matter. The micro-particles are charged with opposite sex by pulsed corona, which can strengthen the aggregation of the charged agglomerating agent and improve the agglomeration and removal effect of the micro-particles.

Example 2

As shown in Figure 2, the basic content of this embodiment is the same as that of Embodiment 1, the difference is that it also includes a pretreatment unit 400, and the pretreatment unit 400 is used to spray the mist of agglomerating agent or water or salt solution into the flue gas Droplets, water is used in this embodiment, and the particle size of the agglomerating agent or water sprayed into the pretreatment unit 400 is 0.2-3 μm. The pretreatment unit 400 includes a pretreatment nozzle 410, which is used to spray agglomerating agent or water or salt solution droplets into the flue gas, and what is sprayed in this embodiment is: water droplets , The droplet size is 0.2-3μm.

The emission reduction effect of fine particles using the removal device is as follows, wherein: PM10 emission reduction efficiency (%) is: 47.1%, PM2.5 emission reduction efficiency (%): 34.3%, improving the emission reduction effect of fine particles. Compared with Example 1, PM10 emission reduction efficiency (%) is: increased from 44.1% to 47.1%, PM2.5 emission reduction efficiency (%): increased from 28.3% to 34.3%. By repeatedly discussing its mechanism, it is believed that its mechanism may be:

(1) The emission reduction efficiency of PM10/2.5 has been improved. The reason may be that the pretreatment unit 400 pre-treats the fine particles in the flue gas, so that the fine particles in the flue gas are pre-grown and the overall agglomeration is improved. effect, thereby improving the overall emission reduction effect of fine particulate matter.

(2) In a high-voltage pulsed corona environment, there may be two charging mechanisms: diffusion charging and electric field charging. The applicant has found through long-term research that the diffusion charging mechanism can make fine particles positively charged, and the electric field The charging mechanism can make fine particles negatively charged; the most important thing is that when the particle size is different, the diffusion charging and the electric field charging will play different leading roles, that is, when the particle size is small, the diffusion charging plays a leading role. And make the particles positively charged. When the particle size is large, the electric field charge plays a leading role and makes the particles negatively charged; however, when the particle size is between the two (hereinafter referred to as: medium particle size particles) , the two mechanisms of diffusion charging and electric field charging will show a competitive effect and make the particles uncharged. When spraying water droplets into the flue gas through the pretreatment nozzle 410 of the pretreatment unit 400, it may be improved. Through the combination of fog droplets and medium-sized particles in fine particles, water droplets and medium-sized particles form larger particles. It should be paid special attention that the formation of larger particles here is not just the particles in the water. Under the action of fog droplets, larger particles are agglomerated, and the particles and water are combined to form a mixture of larger particles and water or a coating layer is formed on the surface of the particles, which increases the particle size in the particles and makes the particles avoid the middle particle size. Therefore, after the pulse charging unit 100, the fine particles will basically be positively or negatively charged, thereby strengthening the charging effect of the medium particle size particles. Through the pretreatment unit 400 It cooperates with the pulse corona electrode 110 to improve the charging effect of the particles in the flue gas, and provides a strong guarantee for the subsequent particle agglomeration, overcomes the technical difficulties in the prior art, and has a significant progress.

Example 3

As shown in Figure 3 and Figure 4, the basic content of this embodiment is the same as that of Embodiment 2, the difference is that: the described pretreatment unit 400 is arranged on the pipe axis of the expansion tube 510, and the pretreatment unit 400 includes a pretreatment The nozzle pipe 410 and the guide part 420, wherein the guide part 420 is arranged on the windward side of the pretreatment nozzle 410, and the guide part 420 is arranged at the pipe wall edge position of the expansion pipe 510, wherein the guide part 420 comprises a first guide The flow guide block 421 and the second flow guide block 422, the first flow guide block 421 is arranged on the windward side of the second flow guide block 422, and the first flow guide block 421 and the second flow guide block 422 are arranged at the edge position of the expansion tube 510 , and there is no diversion block directly in front of the pretreatment nozzle 410, thereby strengthening the wrapping and combination of the salt solution droplets and the particles, and the connection line between the first diversion block 421 and its corresponding second diversion block 422 is parallel On the tube wall of the expansion tube 510, the first flow guide block 421 and the second flow guide block 422 together form an "umbrella"-shaped flow guide member 420, which is arranged on the pretreatment nozzle 410 the windward side. The pretreatment nozzle 410 is connected to the storage tank of the saline solution, and the pretreatment nozzle 410 is used to spray the mist of the saline solution into the pipeline. The droplet size is 0.2-3μm, and the salt solution is NaCl solution.

PM10 emission reduction efficiency (%): 45.2%, PM2.5 emission reduction efficiency (%): 36.8%. In this implementation, by setting the flow guide member 420, the first flow guide block 421 and the second flow guide block 422 together form an "umbrella" arrangement, thereby strengthening the turbulence of the smoke and promoting the flow of the smoke and particles to the middle, And make the particles collide and combine with the salt solution sprayed into the pipeline, and then agglomerate or wrap. The agglomeration or wrapping of the droplets of the salt solution and the particles increases the particle size of the particles, thereby reducing the proportion of medium-sized particles. Thereby improving the removal effect.

Example 4

As shown in Figure 5, the basic content of this embodiment is the same as that of Embodiment 1, the difference being that: the positive pole of the corona power supply 230 is connected to the positive corona electrode 212, the negative pole of the corona power supply 230 is connected to the negative corona electrode 222, Therefore, it is ensured that the positive and negative corona electrodes 212 and the negative corona electrodes 222 provide substantially the same amount of positive and negative charges.

The collection electrode 310 includes a collection power supply 311, a collection positive electrode 312 and a collection negative electrode 313, and the collection positive electrode 312 is arranged on the windward side of the collection negative electrode 313, that is, the flue gas first passes through the collection positive electrode 312 Flow to capture negative electrode 313. The positive pole of the collection power supply 311 is connected to the positive collection electrode 312 , and the negative pole of the collection power supply 311 is connected to the negative collection electrode 313 . After the particles with different charges pass through the positively charged droplet spraying mechanism 210 and the negatively charged droplet spraying mechanism 220, they have basically agglomerated and grown up, and carry different charges. If the particle agglomerates carry a negative charge, then the collecting positive electrode 312 and the particle agglomerates attract each other, and under the action of Coulomb force, the particle agglomerates are adsorbed on the collecting positive electrode 312; the particle agglomerates carry a positive charge, then The collection negative electrode 313 and the particle agglomerates attract each other, and under the action of Coulomb force, the particle agglomerates are adsorbed on the collection negative electrode 313, and the vibrating device is shaken off or discharged into the collector 320 during the vibration process , and is collected by the collector 320. Therefore, the dust collection effect of the collecting electrode 310 on the particulate matter is improved, and the removal effect of fine particulate matter is improved.

In addition, a baffle 530 is arranged between the pulse charging unit 100 and the agglomeration unit 200. The agglomeration unit 200 is located in the removal pipeline 500, which is arranged between the pulse charging unit 100 and the agglomeration unit 200. The baffle 530 promotes the detachment. In addition to the disturbance of the flue gas in the pipeline 500, the self-agglomeration process of fine particles is strengthened, and the agglomeration effect of the nucleation process is improved, so that the positively charged droplet spraying mechanism 210 and the negatively charged droplet spraying mechanism 220 are sprayed with different charges. The material makes the fine particles agglomerate, improves the agglomeration effect, and thus promotes the removal of fine particles. In this embodiment, the pretreatment nozzle 410 sprays the mist of the agglomerating agent into the pipeline, and the agglomerating agent is an aqueous solution of sodium carboxymethylcellulose (CMC).

Emission reduction step of the present invention is specifically as follows:

Step 1: Pulse charging of fine particles

The flue gas first enters the pretreatment unit 400 of the removal device for pretreatment. The removal device is the above-mentioned pulse corona discharge device for removing fine particles in the iron ore sintering flue gas. The pretreatment unit 400 includes a pretreatment nozzle Pipe 410, the pretreatment nozzle 410 is used to spray the mist of agglomerating agent or water or salt solution into the flue gas, and the particle size of the mist is 0.2-3 μm; For large particles, the agglomerating agent or water or salt solution forms a coating layer on the surface of the fine particles, increasing the particle size in the particles, making the particles avoid the medium particle size, and reducing the proportion of fine particles in the medium particle size range;

The pretreated flue gas enters the removal pipe 500 of the removal device. Under the action of the pulse corona electrode 110 of the pulse charging unit 100, the fine particles are charged by pulse discharge, and the fine particles are charged according to the particle size. Opposite charges;

Step 2. Charged agglomeration and growth of particles

The charged fine particles enter the agglomeration unit 200, the flue gas first passes through the positively charged droplet spraying mechanism 210, and the positively charged droplet spraying mechanism 210 sprays the positively charged droplet into the removal pipeline 500, and the negatively charged particles Attract and agglomerate with positively charged mist droplets to form particle agglomerates; then the flue gas moves to the negatively charged mist spray mechanism 220, and the negatively charged mist spray mechanism 220 sprays negatively charged mist droplets into the removal pipeline 500, and the negatively charged mist The droplets and the positively charged mist droplets are attracted and agglomerated to form particle agglomerates; the positively charged particles may be positively charged by pulse discharge, or they may be positively charged after the particles are combined with the agglomerating agent droplets;

Step 3. Capture aggregates

The particle agglomerates move to the collection unit 300, the collection electrode 310 of the collection unit 300 collects the agglomerated particles, vibrates the collection electrode 310, and the captured particles are shaken off or discharged to the collection unit during the vibration process. In the device 320, the fine particles in the flue gas are removed.

The present invention has been described in detail above with reference to specific exemplary embodiments. However, it should be understood that various modifications and changes can be made without departing from the scope of the present invention as defined in the appended claims. The detailed description and drawings are to be regarded as illustrative only and not restrictive, and any such modifications and variations, if any, are intended to fall within the scope of the invention as described herein. In addition, the background art is intended to illustrate the research and development status and significance of the present technology, and is not intended to limit the present invention or the application and the application field of the present invention.

More specifically, although exemplary embodiments of the present invention have been described herein, the present invention is not limited to these embodiments but includes modifications, omissions, Any and all embodiments of combinations, adaptations, and/or substitutions (eg, between individual embodiments). The definitions in the claims are to be interpreted broadly according to the language used in the claims and not limited to the examples described in the foregoing detailed description or during the prosecution of this application, which examples should be considered non-exclusive. For example, in the present invention, the term "preferably" is not exclusive, and here it means "preferably, but not limited to". Any steps recited in any method or process claims may be performed in any order and are not limited to the order presented in the claims. Accordingly, the scope of the present invention should be determined only by the appended claims and their legal equivalents, rather than by the description and examples given above.

Claims (9)

1. a kind of pulse corona charge removing sinters the device of flue gas fine particulate matter, it is characterised in that：Including

Pulse charge unit (100), the pulse charge unit (100) is provided with impulse electric corona electrode (110), impulse electric corona electrode (110) particulate matter is made to carry electric charge by pulsed discharge；

Agglomeration unit (200), the agglomeration unit (200) includes positive electricity droplet spraying mechanism (210) and negative electricity droplet spraying mechanism (220), positive electricity droplet spraying mechanism (210) or negative electricity droplet spraying mechanism (220) in flue gas for spraying into positive electricity Lotus or the agglomerator droplet of negative electrical charge, agglomerator droplet are reunited with the particulate matter with electric charge；

Capture unit (300), the capture unit (300) is for trapping the particulate matter after reuniting；

Described pulse charge unit (100), agglomeration unit (200) and capture unit (300) along flue gas flow direction according to It is secondary to be arranged in gas pipeline.

2. a kind of pulse corona charge removing according to claim 1 sinters the device of flue gas fine particulate matter, its feature It is：Described positive electricity droplet spraying mechanism (210) includes positive corona atomizing nozzle (211), positive corona electrode (212) and positive electricity Dizzy power supply (213), the shower nozzle one (214) of described positive corona atomizing nozzle (211) is arranged in flue, positive corona electrode (212) it is arranged in positive corona atomizing nozzle (211), positive corona electrode (212) is connected with positive corona power supply (213).

3. a kind of pulse corona charge removing according to claim 1 sinters the device of flue gas fine particulate matter, its feature It is：Described negative electricity droplet spraying mechanism (220) includes negative corona atomizing nozzle (221), negative corona electrode (222) and negative electricity Dizzy power supply (223), the shower nozzle two (224) of described negative corona atomizing nozzle (221) is arranged in flue, negative corona electrode (222) it is arranged in negative corona atomizing nozzle (221), negative corona electrode (222) is connected with negative corona power supply (223).

4. a kind of pulse corona charge removing according to claim 1 sinters the device of flue gas fine particulate matter, its feature It is：Pulse power frequency used by described impulse electric corona electrode (110) is 150~250Hz, and voltage is in 50~110kV.

5. a kind of pulse corona charge removing according to claim any one of 1-4 sinters the dress of flue gas fine particulate matter Put, it is characterised in that：Described gas pipeline for removing pipeline (500), the removing pipeline (500) with diameter greater than flue (600) diameter, the inlet end of described removing pipeline (500) is connected by expanding pipe (510) with flue (600).

6. a kind of pulse corona charge removing according to claim 5 sinters the device of flue gas fine particulate matter, its feature It is：Also include pretreatment unit (400), pretreatment unit (400) is for penetrating agglomerator or water or salting liquid in flue gas Droplet.

7. a kind of pulse corona charge removing according to claim 6 sinters the device of flue gas fine particulate matter, its feature It is：The agglomerator or the mist droplet particle size of water or salting liquid that pretreatment unit (400) is sprayed into are 0.2~3 μm.

8. a kind of pulse corona charge removing according to claim 7 sinters the device of flue gas fine particulate matter, its feature It is：Described pretreatment unit (400) is arranged at the pipeline axle center of expansion pipe (510).

9. a kind of pulse corona charge removing according to claim 8 sinters the device of flue gas fine particulate matter, its feature It is：Pretreatment unit (400) includes pretreatment jet pipe (410) and diversion component (420), and wherein diversion component (420) is set In the weather side of pretreatment jet pipe (410), pretreatment jet pipe (410) is for spraying into agglomerator or water or salting liquid in pipeline Droplet.