CN207605871U - A kind of water fog charge coupling particle modified synergistic electrostatic precipitation system of coordinated desulfurization wastewater treatment - Google Patents

Abstract

The utility model provides a water mist charging coupled particle modification synergistic electrostatic precipitator system for cooperative desulfurization wastewater treatment. The system includes a water mist charging device and an electrostatic precipitator. The water mist charging device is installed On the flue in front of the dust collector entrance, the water mist charging device is connected to the desulfurization wastewater temporary storage pool, the water mist charging device is provided with an atomizing nozzle, and a corona ring is installed downstream of the atomizing nozzle, and the corona ring is connected to a high voltage power supply. The utility model obtains the mixed spray of desulfurization wastewater and particle modifier through the dual-fluid atomizing nozzle, and rapidly charges through the charging ring, which can not only effectively treat the desulfurization wastewater, but also fully agglomerate the fine particles and improve the removal efficiency of the particles ; At the same time, the water mist charging device can be installed on the flue in front of the entrance of the electrostatic precipitator, which is flexible and convenient.

Description

A kind of synergistic desulfurization wastewater treatment by water mist charge coupling particle modification and synergistic electrostatic removal dust system

technical field

The utility model relates to the fields of heat pipe waste heat recovery, flue gas dedusting and organic matter removal, in particular to a water mist charge coupling particle modification and synergistic electrostatic dust removal technology that utilizes heat pipes to recover flue gas waste heat and cooperates with desulfurization wastewater treatment .

Background technique

Heat pipe technology is a heat transfer element called a "heat pipe" utility model invented by George Grover of the Los Alamos National Laboratory in the United States in 1963. It makes full use of the principle of heat conduction and phase change. The rapid heat transfer properties of the medium quickly transfer the heat of the heating object to the heat source through the heat pipe, and its thermal conductivity exceeds that of any known metal. Compared with the most commonly used shell-and-tube heat exchanger in coal-fired flue gas waste heat recovery, the heat pipe heat exchanger has the advantages of high heat transfer efficiency, compact structure, small pressure loss, and is beneficial to control dew point corrosion. There is more potential in waste heat recovery and utilization.

In addition, my country is the world's largest coal producer and consumer, and the only major country in the world that uses coal as its main energy source. Coal-fired power plants are an important emission source of atmospheric particulate matter. With the rapid development of my country's electric power industry, continuous growth in power generation, and continuous increase in coal consumption, the total amount of smoke and dust emissions from coal-fired power plants has reached about 3.5 million tons per year for more than 30 years, of which Fine particulate matter emissions exceeded 3 million tons. A large amount of coal-fired smoke not only causes serious environmental pollution, but also seriously endangers human health.

Therefore, in order to reduce the emission of coal-fired smoke and dust, coal-fired power plants have flue gas dust removal equipment to ensure that the flue gas is effectively purified before it enters the atmosphere. At present, about 90% of the dust purification equipment in my country's coal-fired power plants use electrostatic precipitators (ESP). ESP dust removal efficiency is high, and the removal efficiency of dust particles with a particle size above 10 μm is as high as 99%, but for fine particles below 10 μm (especially 2.5 μm), it is difficult to effectively remove fine particles due to the difficulty of charging the fine particles, which is difficult to achieve The ultra-clean emission of flue gas particulate matter, at the same time, because the fine particulate matter contains a large amount of harmful substances to the human body, it seriously affects people's health.

In addition, in order to achieve ultra-clean emission of SO2 in flue gas, coal-fired power plants generally adopt wet desulfurization technology, which discharges a large amount of wastewater while efficiently removing SO2. The conventional "three-box" process is difficult to remove Cl ^- in wastewater, which makes it difficult to recycle the treated wastewater. However, membrane filtration, MVR and other desulfurization wastewater zero discharge technologies have high investment and operation costs, which limits their practical application.

In view of the above problems, the utility model provides a new flue gas waste heat utilization heat pipe and its flue gas pollutant treatment system and method, which fully utilizes the heat source, reduces energy consumption, and improves the smoke exhaust effect.

Utility model content

In view of the above problems, the utility model has been improved on the basis of the previous utility model, and the desulfurization wastewater and particle modifier are used to form charged droplets through the water mist charging device, and the mixed charged droplets are sprayed into the flue gas, Fully contact with the flue gas, so that the fine particles can be effectively reunited and charged. Through the joint action of the water mist charging device and the electrostatic precipitator, the removal efficiency of fine particles can be improved, and at the same time, the desulfurization wastewater can be effectively treated to obtain a synergy Water mist charge coupling particle modification and synergistic electrostatic precipitator technology for desulfurization wastewater treatment.

In order to achieve the above object, the technical scheme of the utility model is as follows:

A water mist charging coupling particle modification synergistic electrostatic precipitator system for synergistic desulfurization wastewater treatment, the system includes a water mist charging device and an electrostatic precipitator, and the water mist charging device is installed in front of the inlet of the electrostatic precipitator On the flue, the water mist charging device is connected to the desulfurization wastewater temporary storage pool, the water mist charging device is equipped with an atomizing nozzle, and a corona ring is installed at the rear of the atomizing nozzle, and the corona ring is connected to a high-voltage power supply; the flue gas first passes through the water Fog charging device, the desulfurization wastewater is sprayed from the temporary storage pool through the two-fluid atomizing nozzle, charged by the corona ring powered by a high-voltage power supply, and then fully mixed with the flue gas to form wet particles; then, the wet particles undergo In a drying process, the water evaporates gradually, and the charge gradually transfers from the liquid droplets to the particles, so that some dust particles are charged.

Preferably, a heater is also included, and the desulfurization wastewater is preheated by the heater before entering the water mist charging device.

Preferably, the system includes a particle modifier storage tank, and the preheated desulfurization wastewater is added with the particle modifier through the particle modifier storage tank to form a mixture, and then enters the water mist charging device.

Preferably, the heater is arranged in the flue.

Preferably, the electrostatic precipitator includes an electrostatic precipitator section, an electrostatic/ultrasonic coupling dedusting section, and a plasma/ultrasonic coupling catalytic field dedusting section, wherein the electrostatic precipitator section is arranged at the front, and a dust collection plate is arranged inside the electrostatic precipitator section to generate Electrostatic field, the electrostatic/ultrasonic coupling dust removal section is set behind the electrostatic dust removal section, and the electrostatic/ultrasonic coupling dust removal section is equipped with a dust collection plate and an ultrasonic generator, and an electrostatic field is generated inside, and the ultrasonic generator is connected to the external ultrasonic generator. The plasma/ultrasonic coupling catalytic field dedusting section is set behind the electrostatic/ultrasonic coupling dedusting section, and the plasma/ultrasonic coupling catalytic field dedusting section is equipped with a plasma reactor and an ultrasonic generator, and the ultrasonic generator is connected to an external ultrasonic generator .

Preferably, the electrostatic precipitating section has two stages, respectively the first stage and the second stage; the electrostatic/ultrasonic coupling dust removal stage has two stages, respectively the third stage and the fourth stage, and the plasma/ultrasonic coupling catalytic field The dust removal section is the first level and the fifth level.

Preferably, the dust-collecting plates are parallel to each other; a number of corona electrodes are evenly arranged between the dust-collecting plates; a dust-cleaning device is provided on the surface of the dust-collecting plates.

Preferably, the plasma reactor adopts a wire-plate structure, including a grounding plate, a ceramic plate, a corona electrode and a high-voltage power supply, the grounding plate is grounded, and the ceramic plate is covered on the plate to form a line plate, and the ceramic plate is used as a barrier medium. The dielectric barrier discharge is formed, and the catalyst is supported at the same time as a catalyst carrier; the corona electrode is arranged between the opposite ceramic plates of the two wire plates.

Preferably, a waste heat utilization device is provided at the front of the water mist charging device, and the waste heat utilization device is a heat pipe, and the heat pipe includes a vertical part, a horizontal part and a vertical pipe, wherein the bottom end of the vertical part communicates with the horizontal part , the horizontal part extends from the bottom end of the vertical part in a direction away from the vertical part, the lower part of the horizontal part communicates with a plurality of vertical pipes, the vertical pipes are arranged in the flue, and the vertical part is arranged outside the flue .

Preferably, the horizontal part is a flat tube structure, the vertical tube is a round tube structure, and the horizontal part is a square structure; the vertical tubes are in multiple rows, and two adjacent rows are arranged in a staggered arrangement; the vertical tubes The center of the circle and the centers of two adjacent vertical tubes in the adjacent row form an isosceles triangle, and the centers of the vertical tubes are located at the points of the vertices of the isosceles triangle.

Compared with the prior art, the utility model has the following advantages:

1) The utility model obtains the mixed spray of desulfurization wastewater and particle modifier through the dual-fluid atomizing nozzle, and quickly charges through the charging ring, which can not only effectively treat the desulfurization wastewater, but also fully agglomerate the fine particles and improve the desulfurization of the particles. At the same time, the water mist charging device can be installed on the flue in front of the entrance of the electrostatic precipitator, which is flexible and convenient. It can greatly remove PM2.5 particles.

2) The desulfurization wastewater is firstly heated by the residual heat of the flue gas after the electrostatic precipitator to increase the subsequent evaporation rate of the desulfurization wastewater;

3) Install the water mist charging device on the flue in front of the entrance of the electrostatic precipitator, use desulfurization wastewater as the atomization medium, and combine the water mist charging technology with the electrostatic precipitator;

4) By adding particle modifiers to the desulfurization wastewater: on the one hand, the wastewater produced by flue gas desulfurization can be effectively treated, reducing the cost of desulfurization wastewater treatment; Promote the agglomeration of particles in the flue gas, thereby improving the removal efficiency;

5) The mixture of desulfurization wastewater and particle modifier forms a mixed spray through a two-fluid atomizing nozzle, and is sprayed into a charging ring powered by a high-voltage power supply to form charged droplets;

6) The flue gas is fully mixed with the charged liquid droplets containing the particle modifier, which enhances the viscous force and Coulomb force between the particles, promotes the agglomeration and growth of the dust particles in the flue gas, and improves the charging characteristics of the dust particles. Then, Moist particles undergo a drying process, the water gradually evaporates, and the charge gradually transfers from the liquid droplets to the particles, so that some dust particles are charged;

7) The charged particles enter the electrostatic precipitator. Due to the increase of particle agglomeration and pre-charging, the efficiency of the electrostatic precipitator to remove fine particles is effectively improved;

8) The utility model transforms the original electrostatic precipitator. By dividing it into three different sections, each section has targeted removal of different pollutants, which not only can well realize the removal of large particles in the smoke Removal, and through the coagulation and agglomeration of particles by ultrasonic waves, it can effectively remove fine particles, and can further remove PM10 and PM2.5. Using plasma technology to degrade organic pollutants, combined with the high-frequency dispersion effect of ultrasonic waves, can efficiently degrade organic pollutants in flue gas. The utility model realizes the removal of organic matters while realizing efficient dust removal of coal-fired flue gas.

9) The utility model improves the structure of the evaporation end of the heat pipe in waste heat utilization, extends the evaporation end of the heat pipe to a farther direction, and makes the heat absorption of the evaporation end of the heat pipe without changing the volume of the condensation end of the heat pipe The area increases, so the heat absorption range of the heat pipe can be expanded, and the heat at the farthest end of the heat source can be absorbed. Compared with the prior art, the evaporating end and the condensing end of the heat pipe keep the same size. At the same time, the volume and footprint of the heat exchanger are reduced, making the structure compact.

10) A large number of numerical simulations and experimental studies have been carried out, and the optimal structure of the distribution structure of heat pipes in waste heat utilization has been carried out, and the optimal relational expression of heat pipe distribution has been obtained through research, and the distribution of heat pipes has been further improved. Excellent heat absorption, lower cost.

Description of drawings

Fig. 1 is a schematic structural diagram of the flue gas treatment device of the present invention.

Fig. 2 is a structural schematic diagram of the heat pipe of the present invention.

FIG. 3 is a schematic view of FIG. 2 viewed from the bottom.

Fig. 4 is a schematic diagram of the partial structure of the heat pipe provided with the communication pipe of the present invention.

Fig. 5 is a structural schematic diagram of the heat pipe arranged in the flue of the utility model.

FIG. 6 is a partially enlarged and annotated schematic diagram of FIG. 3 .

Fig. 7 is a schematic structural diagram of the electrostatic precipitator of the present invention.

Fig. 8 is a schematic diagram of the structure of the plasma reactor in the electrostatic precipitator.

In the figure: Among them, 1. Water mist charging device 2. Two-fluid atomizing nozzle 3. Charging ring 4. Insulator 5. High voltage power supply 6. Chimney 7. Static rear flue 8. Electrostatic precipitator 9. Heater 10 . Desulfurization wastewater temporary storage pool 11. Particle modifier storage tank

Heat pipe:

101-vertical part, 102-horizontal part, 103-vertical pipe, 104-pipe, 105-air channel, 106-flue gas pipe, 107-connecting pipe

Electrostatic precipitators:

81-shell, 82-dust collecting plate, 83-ultrasonic generator, 84-grounding plate, 85-induced fan, 86-ash hopper, 87-ceramic plate, 88-corona electrode, 89-high voltage power supply

Detailed ways

Below in conjunction with accompanying drawing, specific embodiment of the present utility model is described in detail.

In this article, if there is no special explanation, when it comes to formulas, "/" means division, and "×" and "*" mean multiplication.

As shown in Figure 1, a water mist charging coupled particle modification synergistic electrostatic precipitator system for cooperative desulfurization wastewater treatment, the system includes a water mist charging device 1 and an electrostatic precipitator 8, the water mist charging device 1 is installed on the flue at the front of the entrance of the electrostatic precipitator 8, the water mist charging device 1 is connected to the desulfurization wastewater temporary storage pool 10, the water mist charging device is equipped with an atomizing nozzle 2, and a corona is installed at the rear of the atomizing nozzle 2 The ring 3 and the corona ring 3 are connected to the high-voltage power supply 5 . In the utility model, the flue gas first passes through the water mist charging device 2, and the desulfurization waste water forms a mixed spray from the temporary storage pool 10 through the dual-fluid atomizing nozzle 2, and then the corona ring 3 powered by the high-voltage power supply 5 is charged, and then It is fully mixed with the flue gas to form wet particles; then, the wet particles undergo a drying process of the waste heat of the flue gas, the water gradually evaporates, and the charge is gradually transferred from the liquid droplets to the particles, so that part of the dust particles are charged.

The utility model obtains the mixed spray of desulfurization wastewater and particle modifier through the dual-fluid atomizing nozzle, and rapidly charges through the charging ring, which can not only effectively treat the desulfurization wastewater, but also fully agglomerate the fine particles and improve the removal efficiency of the particles ; At the same time, the water mist charging device can be installed on the flue in front of the entrance of the electrostatic precipitator, which is flexible and convenient. Compared with the current existing technology, the water mist charging device is installed on the flue in front of the entrance of the electrostatic precipitator, and the desulfurization wastewater is used as the atomization medium, and the water mist charging technology is combined with the electrostatic precipitator, which can be extremely Greatly improve the dust removal ability.

Preferably, the system further includes a heater 9 through which the desulfurization wastewater is preheated before entering the water mist charging device 1 . Preferably, the heater 9 is a waste heat utilization heat exchanger of the flue 7 after the electrostatic precipitator 8 .

By using the waste heat of the flue gas after the electrostatic precipitator to heat the desulfurization wastewater first, the subsequent evaporation rate of the desulfurization wastewater is increased, and the dust removal effect is further improved.

Preferably, the system includes a particle modifier storage tank 11 , and the preheated desulfurization wastewater is added to the particle modifier storage tank 11 to form a mixture, and then enters the water mist charging device 2 .

The utility model adds particle modifiers in the desulfurization wastewater: on the one hand, the wastewater produced by flue gas desulfurization can be effectively treated, reducing the cost of desulfurization wastewater treatment; on the other hand, the addition of agglomerating agents can Better promote the agglomeration of particles in the flue gas, thereby improving the removal efficiency.

The working process of the utility model is as follows: the flue gas first passes through the water mist charging device 1, the desulfurization wastewater is preheated from the temporary storage pool 10 through the heater 9, and then the particle modifier is added from the particle modifier storage tank 11 to form a mixture. The two-fluid atomizing nozzle 2 forms a mixed spray, and the corona ring 3 powered by the high-voltage power supply 5 is charged and then fully mixed with the flue gas; on the one hand, the charged droplets can humidify, cool and temper the flue gas; On the other hand, after the particles in the flue gas contact with the mixed droplets of desulfurization wastewater, the viscous force and Coulomb force between the particles are enhanced, which promotes the agglomeration and growth of dust particles in the flue gas; subsequently, the wet particles undergo a drying process. During the process, the water gradually evaporates, and the charge gradually transfers from the liquid droplets to the particles, so that some dust particles are charged, and at the same time, the desulfurization wastewater is recycled after evaporation;

When the flue gas enters the 8-level electric field of the electrostatic precipitator, the lowering of the flue gas temperature and the increase of the relative humidity of the flue gas are beneficial to the operation of the electrostatic precipitator, and the charged liquid droplets can promote the agglomeration of dust particles, increase the particle size, and improve the efficiency of the electrostatic precipitator. Particle charging characteristics, the combined effect of these factors can improve the efficiency of electrostatic precipitator to remove dust, especially fine dust (PM2.5);

After the joint action of the water mist charging device and the electrostatic precipitator, the flue gas is effectively purified, and then discharged through the chimney 6 and enters the atmosphere.

The insulator 4 is arranged between the high-voltage power supply 5 and the corona ring 3, which can effectively ensure the insulation effect of the exterior of the water mist charging device and ensure personal safety.

Preferably, the high voltage of the high voltage power supply is not more than 80kV (unit).

Through the above, the dust removal for fine particles below 10 μm (especially 2.5 μm) can be greatly improved, and the dust removal efficiency can reach more than 95%.

In order to further enhance the dust removal effect, the utility model further improves the dust collector.

As a preference, as shown in Figure 7, the electrostatic precipitator 8 includes an electrostatic precipitator section, an electrostatic/ultrasonic coupling dedusting section, and a plasma/ultrasonic coupling catalytic field dedusting section, wherein the electrostatic precipitator section is arranged at the front, and a dust collecting pole plate 82 is arranged inside An electrostatic field is generated in the electrostatic dust removal section, and an ash hopper 86 is arranged below, and the electrostatic/ultrasonic coupling dust removal section is arranged behind the electrostatic dust removal section, and an electrostatic field is generated inside. The generating end and the ultrasonic generating end are connected to the external ultrasonic generator 83; the plasma/ultrasonic coupling catalytic field dedusting section is set behind the electrostatic/ultrasonic coupling dedusting section, and the plasma/ultrasonic coupling catalytic field dedusting section is provided with a plasma reactor and an ultrasonic generator The ultrasonic generator is connected to the external ultrasonic generator.

The utility model transforms the original electrostatic precipitator, and divides it into three different sections, each section has a targeted removal of different pollutants, which can not only remove large particles in the flue gas well , and the coagulation and agglomeration of particles by ultrasonic waves can effectively remove fine particles, especially the remaining PM10 and PM2.5 particles. Using plasma technology to degrade organic pollutants, combined with the high-frequency dispersion effect of ultrasonic waves, can efficiently degrade organic pollutants in flue gas. The utility model realizes the removal of organic matters while realizing efficient dust removal of coal-fired flue gas.

The utility model avoids the impact of particles on the dust removal effect through the reasonable collocation of the sequence of these three stages, so that the dust removal effect reaches the best. On the contrary, it has been found through a large number of experiments that if the order of the three stages is not arranged according to the present application, the effect of pollutant discharge is obviously not good.

As a preference, the electrostatic dust removal section and the electrostatic/ultrasonic coupling dust removal section adopt a conventional multi-field design method with wide pole distance and high voltage, the same pole distance is 300mm-400mm, and the operating voltage does not exceed 80kV; as a preference, the electrostatic dust removal section is two levels, respectively, the first level and the second level. By setting two-stage dust removal, large particles, such as PM10 and above, can be removed more efficiently.

Preferably, the electric field strengths of the first stage and the second stage of the electrostatic precipitating section are different. Further preferably, the electric field intensity of the second stage is smaller than that of the first stage. The main reason is that through the first stage of dust removal, the large particles contained in the flue gas are reduced, so by reducing the electric field intensity, it is possible to achieve basically the same effect with less energy.

As preferably, each stage is provided with a plurality of dust collecting pole plates 82, and the dust collecting pole plates 82 are parallel to each other; several corona electrodes are uniformly arranged between the dust collecting pole plates; The dust on the surface of the plate falls to the ash hopper under the shell and is taken away by the ash conveying device.

Preferably, the corona electrode is connected to a high-voltage power supply and establishes an electric field with the dust collecting electrode plate 82 .

The high voltage of the high voltage power supply is not more than 80kV (unit).

As preferably, the system also includes a controller, the electrostatic precipitator section inlet is provided with a PM10 dust detector for detecting the PM10 concentration at the inlet position, the PM10 dust detector is connected with the controller data, and the controller automatically detects the PM10 concentration according to the detected PM10 concentration. Controls the strength of the electric field.

If the detected PM10 concentration becomes higher, the controller automatically increases the intensity of the electric field, and if the detected PM10 concentration becomes lower, the controller automatically reduces the intensity of the electric field.

The controller controls the magnitude of the electric field by controlling the magnitude of the power supplied to the corona electrode.

Through the above-mentioned intelligent control, the size of the electric field is automatically controlled according to the particle concentration, so as to realize the intelligent operation of the system, and can also meet the requirements of energy saving, and further improve the pollutant removal effect of the flue gas.

As preferably, the first-level entrance and the second-level entrance are respectively equipped with PM10 dust detectors, and the controller independently controls the first-level and second-level entrances according to the data detected by the PM10 dust detectors of the first-level entrance and the second-level entrance. The electric field strength in the second stage.

The electrostatic/ultrasonic coupling dedusting section has two stages, namely the third stage and the fourth stage, and the plasma/ultrasonic coupling catalytic field dedusting section has one stage, which is the fifth stage.

In the third and fourth electrostatic/ultrasonic coupling dedusting sections, the establishment of the electrostatic field is the same as that of the first and second stages; an ultrasonic generator is installed in the device, and the ultrasonic generator is connected to the ultrasonic generator 83 to establish an ultrasonic field.

As preferably, the electrostatic/ultrasonic coupling dust removal section inlet section is provided with a pm2.5 detector for detecting the concentration of the inlet position less than pm2.5, the pm2.5 detector is connected with the controller data, and the controller is based on the detected pm2 .5 concentration automatically controls the power of the ultrasonic generator 83.

If the detected PM2.5 concentration becomes higher, the controller automatically increases the power of the ultrasonic generator 83, and if the detected PM2.5 concentration becomes lower, the controller automatically reduces the power of the ultrasonic generator 83.

Through the above-mentioned intelligent control, the power of the ultrasonic generator 83 is automatically controlled according to the particle concentration, so as to realize the intelligent operation of the system, and can also meet the requirement of saving energy and further improve the pollutant removal effect of the flue gas.

Preferably, the third-level entrance and the fourth-level entrance are respectively equipped with pm2.5 detectors, and the controller independently controls the third The size of the sonotrode power in the first and fourth stages.

As preferably, as shown in Figure 8, the plasma reactor adopts line-plate structure, comprises ground pole plate 84, ceramic plate 87, corona electrode 88 and high-voltage AC power supply 89, and ground pole plate 84 is grounded, and ceramic plate 87 covers A wire plate is formed on the pole plate 84, and the ceramic plate 87 is used as a barrier medium to form a dielectric barrier discharge, and at the same time, it is loaded with a catalyst as a catalyst carrier; the corona electrode 88 is arranged between the opposite ceramic plates 87 of the two wire plates.

Preferably, the high voltage AC power source 89 may be the high voltage power source 5 .

The establishment of the ultrasonic field is the same as that of the third and fourth levels.

Preferably, the spacing between opposing faces of opposing ceramic plates 87 does not exceed 5 cm.

As a preference, the final plasma/ultrasonic coupled catalytic field adopts a wire-plate plasma reactor structure and adopts a dielectric barrier discharge method to generate plasma. A number of electrode plates are arranged in parallel in the plasma reactor, a number of corona wires are evenly arranged in the middle, and ceramic plates are attached to the electrode surface as a blocking medium and a catalyst carrier.

A method for removing coal-burning flue gas pollutants by using the electrostatic precipitator described above, comprising the following steps:

1) The coal-burning flue gas enters the electrostatic precipitator section, and the particles in the flue gas are adsorbed to the dust collecting plate in the electrostatic field of the electrostatic precipitator section, and fall into the ash hopper below through the ash cleaning device, and are taken away by the ash conveying device. The electrostatic precipitator section removes the particulate matter in the flue gas, especially the particulate matter above PM10:

2) The flue gas enters the electrostatic/ultrasonic coupling dust removal section from the electrostatic dust removal section. Through the electrostatic/ultrasonic coupling field, the particles undergo intense mechanical vibration in the ultrasonic field, the kinetic energy of the particles increases, and the chance of particle collision also increases. The cohesive force usually causes two particles to condense together after collision. Through continuous collision and coagulation, small particles become large particles, which are easily removed by electrostatic adsorption, and can effectively remove particulate matter below PM2.5 in the flue gas;

3) The flue gas enters the dust removal section of the plasma/ultrasonic coupling catalytic field from the electrostatic/ultrasonic coupling dedusting section, and generates a large amount of plasma in the plasma reactor through dielectric barrier discharge, including high-energy particles and active substances; The organic pollutants in the flue gas undergo complex physical and chemical reactions to degrade organic matter; the catalyst supported by the dielectric baffle plays a catalytic role in the removal of organic matter; the high-frequency dispersion of ultrasonic waves promotes the reaction of organic matter with active substances and catalysts, and enhances the removal of organic matter. remove the effect.

The working principle of the utility model: the utility model reforms the original electrostatic precipitator, wherein the first and second stages are conventional electric fields, the third and fourth stages are electrostatic/ultrasonic coupling fields, and the last stage is plasma/ultrasonic coupling catalytic field. The coal-burning flue gas enters the electrostatic precipitator. In the first and second conventional electrostatic fields, the particles are charged and adsorbed by the dust collecting plate, and after discharge, they adhere to the dust collecting plate. After being removed by the dust cleaning device, they fall Into the ash hopper below, the particulate matter in the flue gas (especially the particulate matter above PM10) is efficiently removed in the electrostatic field. After the third and fourth electrostatic/ultrasonic coupling fields, the particles undergo intense mechanical vibration in the ultrasonic field, the kinetic energy of the particles increases, and the chances of particle collisions also increase. The cohesion between the particles usually makes the two particles condense together after the collision , Through continuous collision and coagulation, small particles become large particles, which are easily removed by electrostatic adsorption, and can effectively remove particulate matter below PM2.5 in flue gas. The final plasma contains a large number of high-energy particles and active substances, which can oxidize and degrade organic pollutants in the flue gas, and cooperate with the catalytic effect of the loaded catalyst and ultrasonic high-frequency dispersion to efficiently remove organic pollutants.

Preferably, a waste heat utilization device is provided at the front of the water mist charging device, and the waste heat utilization device is a heat pipe waste heat utilization device.

As shown in Figures 2 and 5, the waste heat utilization device includes a heat pipe, and the heat pipe includes a vertical part 101, a horizontal part 102 and a vertical pipe 103, wherein the bottom end of the vertical part 101 communicates with the horizontal part 102, and the horizontal part 102 The part 102 extends from the bottom end of the vertical part 101 toward the direction away from the vertical part 101, and the lower part of the horizontal part 102 communicates with a plurality of vertical pipes 103, wherein the vertical pipe 103 is the evaporation end of the heat pipe, and the vertical part 101 is The condensing end of the heat pipe. At least a part of the vertical part is arranged in the air channel, and the vertical pipe and the horizontal part are arranged in the flue gas duct 106

During operation, the heat pipe of the utility model absorbs heat from the flue gas through the vertical pipe 103, then the fluid in the vertical pipe 103 evaporates, enters the vertical part through the horizontal part, and then releases heat to the air in the vertical part , the fluid condenses, and then enters the vertical pipe 103 by gravity.

The utility model improves the structure of the heat pipe by setting the evaporating end of the heat pipe, extends the evaporating end of the heat pipe to a farther direction, and increases the heat absorption area of the evaporating end of the heat pipe without changing the volume of the condensing end of the heat pipe , so that the heat absorption range of the heat pipe can be expanded, and the heat at the farthest end of the heat source can be absorbed. Compared with the heat pipe evaporating end and condensing end in the prior art, the heat exchange efficiency can be increased by more than 45%. At the same time, the volume and footprint of the condensing end are reduced, making the structure compact.

In addition, the utility model sets multiple vertical pipes 103 as the evaporation end of the heat pipe, so that each vertical pipe 103 can be used as an independent heat absorption pipe to add heat absorption, and also increases the heat absorption area of the overall heat pipe evaporation end.

Preferably, the horizontal part 102 is a flat tube structure, and the vertical tube 103 is a round tube structure. By setting the horizontal part as a flat tube structure, the distribution of the vertical tubes 103 can be increased to further improve heat absorption.

Further preferably, the horizontal portion 102 is a square structure.

Preferably, as shown in FIG. 3 , the vertical tubes 103 are arranged in multiple rows, and two adjacent rows are staggered. Through the staggered arrangement, the heat absorption of the heat pipes can be further improved.

Preferably, the vertical tubes 103 are located on the extension line of the midlines of the connecting line segments between the centers of adjacent vertical tubes 103 in adjacent rows. That is, the center of circle of the vertical pipe 103 forms an isosceles triangle with the center of circle of two adjacent vertical pipes 103 in the adjacent row, and the center of circle of the vertical pipe is located at the point of the vertex of the isosceles triangle.

Preferably, as shown in FIG. 4 , a communication pipe 107 is provided between at least two adjacent vertical pipes 103 . In the research, it is found that in the process of absorbing heat in the vertical section, the heat absorbed by the heat-absorbing tubes in different positions will be different, resulting in different pressures or temperatures between the vertical tubes 103, which will cause some of the vertical tubes 103 to be heated If it is too high, the service life will be shortened. Once a problem occurs in one vertical pipe 103, the whole heat pipe may become unusable. Through a lot of research, the utility model sets up connecting pipes 107 in the adjacent vertical pipes, which can make the fluid in the vertical pipes 103 with high pressure flow quickly in the case of different pressures caused by different heating of the vertical pipes. The vertical pipe 103 with low pressure keeps the overall pressure balanced and avoids local overheating or overcooling.

Preferably, a plurality of communication pipes 107 are arranged between adjacent vertical pipes 103 from the lower part of the vertical pipe 103 to the upper part of the vertical pipe 103 . By arranging a plurality of connecting pipes, the pressure of the fluid can be continuously equalized during the process of absorbing heat and evaporating, and the pressure in the entire vertical pipe can be ensured to be equalized.

Preferably, from the bottom of the vertical pipe 103 to the top of the vertical pipe 103, the distance between adjacent communication pipes 107 decreases continuously. The purpose of this is to set up more connecting pipes, because as the fluid flows upwards, the fluid is continuously heated, and as the fluid is continuously heated, the heating in different heat collecting tubes becomes more and more uneven, so through the above settings, it can be guaranteed Achieve pressure equalization as quickly as possible during fluid flow.

Preferably, from the lower part of the vertical pipe 103 to the upper part of the vertical pipe 103, the distance between adjacent communicating pipes decreases continuously and becomes larger and larger. It is found through experiments that the above setting can ensure better and faster pressure equalization in the process of fluid flow. This is also the best connection method obtained through a large number of studies on the law of pressure distribution changes.

Preferably, the diameter of the communication pipe 107 increases continuously from the lower part of the vertical pipe 103 to the upper part of the vertical pipe 103 . The purpose of this is to ensure a larger communication area, because as the fluid flows upwards, the fluid is continuously heated, and as the fluid is continuously heated, the heating in different heat collecting tubes becomes more and more uneven. Therefore, through the above settings, it can be Ensure that pressure equalization is achieved as soon as possible during fluid flow.

Preferably, from the lower part of the vertical pipe 103 to the upper part of the vertical pipe 103, the diameter of the communication pipe 107 increases more and more. It is found through experiments that the above setting can ensure better and faster pressure equalization in the process of fluid flow. This is also the best connection method obtained through a large number of studies on the law of pressure distribution changes.

Through numerical simulation and experiments, it is found that the distance between the vertical pipes 103, including the distance between the same row and the distance between adjacent rows, cannot be too small, too small will lead to excessive distribution of heat pipes, resulting in the heat absorption of each heat pipe Insufficient, too large will lead to too little distribution of heat pipes, resulting in overheating of heat pipes, so this application through a large number of numerical simulations and experiments, summed up the optimal distribution of heat pipe vertical pipe 103 distribution, so that heat pipes can neither absorb heat enough nor can Excessive heat absorption.

As shown in Figure 6, the outer diameter of the vertical tube 103 is d, the distance between the centers of the adjacent vertical tubes 103 in the same row is L, the center of the vertical tube 103 and the adjacent two vertical tubes of the adjacent row The apex angle of the isosceles triangle formed by the center of the straight pipe 103 is A, which meets the following requirements:

Sin(A)=a-b*Ln(d/L), where Ln is a logarithmic function, a and b are parameters, meeting the following requirements:

0.095<a<0.105,0.29<b<0.31;

Further preferably, said a=0.1016, b=0.3043.

Preferably, as d/L gradually decreases, a becomes larger and b becomes larger.

Preferably, 15°<A<80°.

More preferably, 20°<A<40°.

0.1<d/L<0.7, more preferably, 0.2<d/L<0.5.

The above empirical formula is obtained through a large number of numerical simulations and experiments, and the structure obtained through the above relational formula can realize the optimal heat pipe structure, and the error is basically within 3% through experimental verification.

The heat absorption capacity of the heat pipe is 900-1100W, more preferably 1000W;

The temperature of the flue gas is 90-110 degrees Celsius, more preferably 100 degrees Celsius.

The horizontal portion of the heat pipe shown in FIG. 2 is preferably a square, with a side length of 400-600 mm, more preferably 500 mm.

The outer diameter d of the vertical pipe 103 is 9-12 mm, more preferably 11 mm.

Preferably, as shown in FIG. 3 , the system includes two heat pipes, and the horizontal parts 102 of the two heat pipes respectively extend in opposite directions. By setting two symmetrical heat pipes, heat can be absorbed in different directions , to meet the heat transfer requirements.

Although the utility model has been disclosed above with preferred embodiments, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model, so the protection scope of the present utility model should be based on the scope defined in the claims.

Claims (10)

1. A water mist charging coupling particle modification synergistic electrostatic precipitator system for cooperative desulfurization wastewater treatment, the system includes a water mist charging device and an electrostatic precipitator, and the water mist charging device is installed at the entrance of the electrostatic precipitator On the flue at the front, the water mist charging device is connected to the desulfurization wastewater temporary storage pool, the water mist charging device is equipped with an atomizing nozzle, and a corona ring is installed at the rear of the atomizing nozzle, and the corona ring is connected to a high-voltage power supply; the flue gas first After passing through the water mist charging device, the desulfurization wastewater is sprayed from the temporary storage pool through the two-fluid atomizing nozzle, charged by the corona ring powered by a high-voltage power supply, and then fully mixed with the flue gas to form wet particles; The particles undergo a drying process, the water gradually evaporates, and the charge gradually transfers from the liquid droplets to the particles, so that some dust particles are charged. 2. The dust removal system according to claim 1, further comprising a heater, the desulfurization wastewater is preheated by the heater before entering the water mist charging device. 3. The dedusting system according to claim 2, wherein the system comprises a particle modifier storage tank, the preheated desulfurization wastewater is added to the particle modifier through the particle modifier storage tank to form a mixture, Then enter the water mist charging device. 4. The dust removal system according to claim 2, wherein the heater is arranged in the flue. 5. The dust removal system according to claim 1, wherein the electrostatic precipitator comprises an electrostatic precipitator section, an electrostatic/ultrasonic coupling dedusting section and a plasma/ultrasonic coupling catalytic field dedusting section, wherein the electrostatic precipitator section is arranged at the front In the electrostatic precipitator section, a dust collector plate is set to generate an electrostatic field. The electrostatic/ultrasonic coupling dust removal section is set behind the electrostatic precipitator section. An electrostatic field is generated inside, and the ultrasonic generator is connected to an external ultrasonic generator; the plasma/ultrasonic coupling catalytic field dust removal section is set behind the electrostatic/ultrasonic coupling dust removal section, and the plasma/ultrasonic coupling catalytic field dust removal section is equipped with a plasma reactor and ultrasonic Generating end, the ultrasonic generating end is connected with an external ultrasonic generator. 6. The system according to claim 5, characterized in that, the electrostatic precipitator section has two stages, respectively the first stage and the second stage; the electrostatic/ultrasonic coupling dust removal stage has two stages, respectively the third stage The first level and the fourth level, the dust removal section of the plasma/ultrasonic coupled catalytic field is the first level and the fifth level. 7. The system according to claim 5, characterized in that, the dust-collecting plates are parallel to each other; a number of corona electrodes are evenly arranged between the dust-collecting plates; a dust-cleaning device is provided on the surface of the dust-collecting plates. 8. The system according to claim 5, wherein the plasma reactor adopts a line-plate structure, including a grounding plate, a ceramic plate, a corona electrode and a high-voltage power supply, the grounding plate is grounded, and the ceramic plate covers the pole. A wire plate is formed on the board, and the ceramic plate is used as a barrier medium to form a dielectric barrier discharge, and at the same time, the catalyst is loaded as a catalyst carrier; the corona electrode is arranged between the opposite ceramic plates of the two wire plates. 9. The dust removal system according to claim 1, wherein a waste heat utilization device is arranged at the front of the water mist charging device, and the waste heat utilization device is a heat pipe, and the heat pipe includes a vertical part, a horizontal part and a vertical part. Straight pipe, wherein the bottom end of the vertical part communicates with the horizontal part, and the horizontal part extends from the bottom end of the vertical part to a direction away from the vertical part, and the lower part of the horizontal part communicates with a plurality of vertical pipes, and the vertical part The pipe is arranged in the flue and the vertical part is arranged outside the flue. 10. The dust removal system according to claim 9, wherein the horizontal part is a flat tube structure, the vertical tube is a round tube structure, and the horizontal part is a square structure; the vertical tubes are multi-row, wherein The two adjacent rows are arranged in a staggered arrangement; the center of the vertical tubes and the centers of the two adjacent vertical tubes in the adjacent row form an isosceles triangle, and the centers of the vertical tubes are located at the points of the vertices of the isosceles triangles.