CN107175169B - Humidification flow equalization pre-charge particulate matter strengthening and removing system - Google Patents
Humidification flow equalization pre-charge particulate matter strengthening and removing system Download PDFInfo
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- CN107175169B CN107175169B CN201710334210.8A CN201710334210A CN107175169B CN 107175169 B CN107175169 B CN 107175169B CN 201710334210 A CN201710334210 A CN 201710334210A CN 107175169 B CN107175169 B CN 107175169B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/16—Plant or installations having external electricity supply wet type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
- B03C3/014—Addition of water; Heat exchange, e.g. by condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/36—Controlling flow of gases or vapour
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/36—Controlling flow of gases or vapour
- B03C3/361—Controlling flow of gases or vapour by static mechanical means, e.g. deflector
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/66—Applications of electricity supply techniques
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Abstract
The invention relates to a humidifying and flow-equalizing pre-charged particle enhanced removal system which sequentially comprises a liquid drop injection device, a flow equalizing device combining flow inhibition and flow guiding and a charge enhanced discharge device along the smoke direction, wherein the liquid drop injection device comprises a nozzle and a bracket, the bracket is arranged perpendicular to the smoke direction, the bracket is provided with mutually parallel pipelines, and the nozzle is arranged on the pipelines; the flow equalizing device combining flow resistance and flow guiding comprises a baffle with openings, the porosity of the baffle is between 40% and 50%, and the diameter of each opening is between 30mm and 60 mm; the charge strengthening discharge device comprises a polar line, the polar line is arranged behind the baffle and is arranged on the suspension frame, and the polar line is connected with a power supply. The invention combines the flue gas humidification, the gas flow uniform distribution and the high-voltage electrostatic field, strengthens the charge of particles from multiple aspects, optimizes the flow field distribution of the flue gas, reduces the efficiency loss of a subsequent pollution emission reduction system caused by nonuniform flow field, and ensures the high-efficiency removal of ultrafine particles from multiple aspects of flow field, humidification, discharge strengthening and the like.
Description
Technical Field
The invention belongs to the technical field of pollution emission reduction of energy environmental engineering, and particularly relates to a humidifying and flow-equalizing pre-charged particulate matter enhanced removal system.
Background
Haze weather formation and primary fine particulate matter PM2.5Is closely related to the formation of secondary fine particulate matter in the ambient air. The coal combustion process is a fine Particulate Matter (PM)2.5) And secondary particulate matter precursors and the like, and in order to reduce haze weather, the primary PM discharged to coal is required2.5And secondary PM formed from precursor thereof2.5And carrying out strict control. The emission standard of atmospheric pollutants of thermal power plants (GB13223-2011) requires that the emission concentration of dust of the thermal power plants is lower than 30mg/m3Less than 20mg/m in the key area3. Part of the regions/power companies propose that the concentration of the water reaches 5mg/m3The dust emission requirement of the natural gas and gas turbine can even reach 3mg/m3The requirement of near zero emission is met. Wet-type electrostatic precipitator arranges in the desulfurizing tower as atmospheric pollutants control system's terminal processing equipment usually, not only can effectively get rid of smoke and dust particle, PM in the flue gas2.5And simultaneously can synergistically remove SO3Pollutants such as desulfurized gypsum fog drops carried in flue gas after the mercury and demister become important technologies for controlling atmospheric pollutants in coal-fired power plants.
The main working principle of the wet electrostatic dust collector is as follows: spraying water mist to the dust collecting plate, and splitting and further atomizing the water mist after the water mist is charged in a strong corona field formed by a discharge electrode; electric field force and charged water mist collide to intercept, adsorb and condense, and capture fine particles together, and finally the particles reach a dust collecting electrode under the action of the electric field force and are captured. The uniform, high-intensity charging of fine particles is a guarantee of removal efficiency, and the special working environment behind the desulfurization tower poses a serious challenge. After the desulfurizing tower, the flue gas has high humidity and containsA large amount of desulfurizing towers spray the carried fine water mist liquid drops. The fine water mist droplets are easier to adsorb electrons to form space charges than dust particles, the corona current is relatively reduced after the droplets are charged, the dust charge is reduced, and the trapping efficiency is reduced. In order to improve the charging effect of dust, a method of installing a pre-charging device at an inlet section is mostly adopted at present, so that the dust passes through a high-strength charging area before entering a dust remover, and the working performance of a wet electrostatic dust remover is improved. Chinese patent CN205392746U discloses a pre-charge flow equalizing device, which comprises a flow equalizing plate and a corona discharge component, wherein the flow equalizing plate has a flow equalizing effect on flue gas, and forms an electric field with a discharge component in an electric field area, particles in the flue gas are charged and decelerated under the reverse action of the electric field force, so as to create conditions for efficiently trapping the particles in a downstream discharge component and a plate discharge electric field. Chinese patent CN105032611A discloses a pre-charge strengthening system, which comprises an airflow uniform distribution plate, a corona polar line and a dust cleaning nozzle arranged above the corona polar line, wherein a large amount of free electrons, ions and active components can be generated by high-intensity pulse discharge of a pre-charge device. The free electrons and ions make the particles in the flue gas partially pre-charged before entering the dust remover, and the active components make NO and SO2Further absorption by oxidation occurs.
The charging device is limited by a flow field, particle characteristics, a power supply form, an operation environment and the like, and the following problems exist in the removal process of the particles:
1. the concentration of the particulate matters in the system is lower (20 mg/m) under the condition of ultralow emission operation3Even 10mg/m3Below), it is difficult to obtain high removal efficiency;
2. the poor uniformity of the flow field causes a great deal of disturbance to the movement of the particles, which affects the removal efficiency of the particles;
3. part of the particles are influenced by the physicochemical properties of the particles, have low charge quantity and weak migration capacity and are difficult to remove efficiently;
4. most of dust collectors and pre-charging devices are limited by the electrical performance of the reactor by a direct current power supply mode, the output energy is limited, and the energy consumption is high;
the above problems make it difficult for the particulate removal facility to achieve stable ultra-low emission, and it is necessary to improve the particulate characteristics and removal environment from multiple angles such as flow field, particulate characteristics, power supply mode, etc., and to increase the level of charged removal of particulate matter.
Disclosure of Invention
The invention provides a humidifying and flow-equalizing pre-charged particulate matter enhanced removal system aiming at the problems of uneven airflow distribution, difficult charging of ultrafine particulate matters, low charged amount, low removal efficiency and the like in the existing flue gas pollutant emission reduction process.
In order to realize the functions, the invention adopts the technical scheme that:
a humidification and flow equalization pre-charge particulate matter strengthening removal system sequentially comprises a liquid drop injection device, a flow equalization device combining flow blocking and flow guiding and a charge strengthening discharge device along a smoke direction, wherein the liquid drop injection device comprises a nozzle and a support, the support is arranged perpendicular to the smoke direction, the support is provided with mutually parallel pipelines, and the nozzle is arranged on the pipelines; the flow equalizing device combining flow resistance and flow guidance comprises a baffle with openings, the porosity of the baffle is between 40% and 50%, and the diameter of each opening is between 30mm and 60 mm; the charge strengthening discharge device comprises a pole wire, the pole wire is arranged behind the baffle and is installed on the suspension frame, and the pole wire is connected with a power supply.
The invention combines the flue gas humidification, the gas flow uniform distribution and the high-voltage electrostatic field, strengthens the charge of particles from multiple aspects, optimizes the flow field distribution of the flue gas, reduces the efficiency loss of a subsequent pollution emission reduction system caused by nonuniform flow field, and ensures the high-efficiency removal of ultrafine particles from multiple aspects of flow field, humidification, discharge strengthening and the like.
Preferably, the pipelines are arranged perpendicular to the direction of the flue gas, the distance between the pipelines is not more than the effective spraying distance of the nozzles, the spraying direction of the nozzles is perpendicular to the direction of the flue gas, the nozzles on a single pipeline are uniformly distributed, the distance is not more than the effective spraying range of the nozzles, and the nozzles of adjacent pipelines are arranged in a staggered mode.
Preferably, the nozzle is a fine atomizing solid cone nozzle, the flow rate is 2-3L/min, the spraying angle of the nozzle is 60-80 degrees, and the spraying range of the nozzle is 400-500 mm. The fine atomizing solid cone nozzle can generate superfine liquid drops with the particle size range of 60-80 mu m, and the liquid drops are charged through the charging of the nozzle, so that the charging level is improved.
The spraying amount of the superfine liquid drop spraying device is continuously adjustable, and the spraying angle of each nozzle is accurately corrected and matched; the humidifying agent adopted by the superfine droplet spraying device can be process water, and in order to promote the system to remove acid pollutants, the humidifying agent adopted by the superfine droplet spraying device can be alkali liquor.
Preferably, the width of the baffle is 480mm, the baffle comprises a spoiler and a guide plate, the spoiler and the guide plate are adjacently arranged and form a plurality of diamond-shaped areas, and the absolute value of the included angle between the spoiler, the guide plate and the smoke direction is 30-40 degrees; the nearest distance between the centers of the adjacent spoilers and the guide plate is 220mm to 280mm, and the nearest distance between each spoiler and the guide plate is 15mm to 25 mm.
The flow equalizing system combining flow blocking and flow guiding has the advantages that the flow field uniformity is remarkably improved, and simultaneously, due to the original arrangement mode, the included angle between the flow blocking plate and the flow guiding plate and the fluid speed is small, the resistance generated on airflow and the pressure drop caused by the resistance are reduced, and the operation cost of a smoke and wind system is saved.
Preferably, two polar lines are arranged in each diamond area, the two polar lines are respectively arranged perpendicular to the direction of the airflow, the distance between the polar lines is 140mm to 150mm, and the perpendicular distances between the polar lines and the flow blocking plate and the flow guiding plate are 130mm to 160 mm.
Preferably, the porosity of the intermediate region of the baffle is less than the porosity of the edge region.
The high-energy density power supply loads high-density energy between the discharge device and the flow guide device through the charge-enhanced discharge device to generate a high-voltage electrostatic field and high-density ions, so that the charge and collision of particles and liquid drops are promoted; in order to ensure the stability of a high-voltage electrostatic field and high-density ions, preferably, the high-energy density power supply is a resonance inversion high-frequency direct-current power supply or a high-voltage pulse power supply, the rated frequency of the resonance inversion high-frequency direct-current power supply is above 20kHz, the output voltage is continuously adjustable between 0kV and-60 kV, the effective power reaches above 30kW, and the energy efficiency is above 95%; the repetition frequency of the high-voltage pulse power supply is continuously adjustable within 0-1000 Hz, the pulse rising edge is within 20 mus, the pulse width is within 50 mus, the output voltage is continuously adjustable within-20 kV to-80 kV, the instantaneous pulse power reaches more than 1MW, and the energy conversion efficiency is more than 80%.
Preferably, the vertical distance between the suspension frame and the spoiler and the vertical distance between the suspension frame and the spoiler are more than 2.5 times of the distance between the polar line and the spoiler and the guide plate, an insulator is arranged at the connection position of the suspension frame and a power supply, and a heating and hot air blowing device is arranged at the same time. The electrical safety can be ensured.
Preferably, the distance between the droplet ejection device and the flow straightener combining flow resistance and flow guidance is greater than 500 mm.
Preferably, the system is located at the inlet of an electrostatic precipitator. The structure is compact, and no extra space is needed; the electrostatic precipitator is arranged at an inlet of the electrostatic precipitator, a large amount of ultrafine liquid drops are sprayed to a system space, and the liquid drops are rapidly electrified by utilizing the characteristics of high charging speed and high charging quantity and are combined with particles in the flue gas in a collision way, so that the particles are charged; after the particles are combined with the liquid drops, the property is changed towards the direction beneficial to charge, the charge speed and the charge intensity are obviously improved, and the charge quantity of the particles is further improved.
The ultrafine liquid drops generated by the ultrafine liquid drop injection device are combined with the particulate matters, so that the particle size of the particulate matters is increased, the charge property is improved, and the charge speed and the charge quantity are improved; the ultrafine liquid drops generated by the ultrafine liquid drop injection device collide with the particles after charging, so that the charging quantity of the particles is increased; the flow equalizing device combining flow resistance and flow guiding improves the uniformity of a system flow field, and is matched with a charge enhanced discharge system to generate a high-voltage electrostatic field and high-density ions for enhanced charging of particles and liquid drops. The power supply (high energy density power supply device), the charge intensified discharge device and the current equalizing device are matched, the output energy form is favorable for stable generation of high-voltage electrostatic field and high-density particles, and the adopted polar line form, plate form and material have the effect of intensified discharge.
The invention utilizes the superfine droplet injection device to atomize the humidifying agent into superfine droplets, and the superfine droplets can be uniformly distributed in the system space through the optimized arrangement of the injection device, and are fully mixed with the flue gas and effectively humidified; the flow equalizing system combining flow choking and flow guiding is utilized to equalize the high-speed incoming flow of the flue, so that the flow velocity of the flue gas entering the system is uniformly distributed, and the operation effect of a subsequent system is improved; a charge-enhanced discharge device is utilized to generate a high-voltage electrostatic field and high-density ions in the system space, so that particulate matters and liquid drops in the flue gas are effectively charged and are efficiently removed after entering a subsequent pollution emission reduction system; the high-energy density power supply device (power supply) is utilized to stably provide high-density energy required by generating a high-voltage electrostatic field and high-density particles, and the discharge intensity and the charge quantity are further improved through a novel power supply technology and an optimized pole matching form thereof.
The invention has the beneficial effects that:
(1) according to the invention, through the mode of combining flue gas humidification, uniform airflow distribution and a high-voltage electrostatic field, the particle charging is strengthened from multiple aspects, the influence of flue gas components and particle characteristics is not easy, the charging effect is good, and the flue gas flow field is optimized;
(2) according to the invention, the flue gas is effectively humidified by the fine atomization and uniform injection technology, the uniform distribution of a flue gas flow field and the charge of liquid drops and particulate matters are realized by the flow equalizing device, the charge-enhanced discharge device and the high-energy-density power supply device which are combined with flow resistance and flow guide, and the collision and combination of the charged liquid drops and the particulate matters further enhance the charge of the particulate matters, so that the problems of limited charge quantity of the particulate matters and difficulty in charging fine particles are solved, and the efficient removal effect of the particulate matters, especially the fine particulate matters, is further improved;
(3) the invention can effectively improve the uniformity of the flue gas flow field entering the electrostatic dust collector, strengthens the charging effect of particulate matters, has compact structure, good working condition and particle characteristic adaptability and higher technical and application values.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a schematic view showing the construction of an ultrafine droplet discharge apparatus according to the present invention;
FIG. 3 is a schematic diagram of a flow straightener combining flow resistance and flow guidance according to the present invention;
FIG. 4 is a schematic diagram of a charge-enhanced discharge device according to the present invention;
FIG. 5 is a schematic structural view of embodiment 2 of the present invention;
fig. 6 is a schematic structural view of a baffle in embodiment 2 of the present invention.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
Example 1
Referring to fig. 1-4, the system for enhanced removal of humidified, flow-equalizing and pre-charged particles sequentially comprises a liquid drop injection device 1, a flow equalizing device 2 combining flow inhibition and flow guidance and a charge enhanced discharge device 3 along the direction of flue gas, wherein the distance between the liquid drop injection device 1 and the flow equalizing device 2 combining flow inhibition and flow guidance is 1000 mm.
The liquid drop spraying device comprises a nozzle 5 and a bracket 6, the bracket is arranged perpendicular to the direction of flue gas, the bracket is provided with pipelines 7 which are parallel to each other, and the nozzle 5 is arranged on the pipeline 7; the pipeline 7 is arranged perpendicular to the direction of the flue gas, the distance between the pipelines is not more than the effective spraying distance of the nozzles 5, the spraying direction of the nozzles 5 is perpendicular to the direction of the flue gas, the nozzles on a single pipeline are uniformly distributed, the distance is not more than the effective spraying range of the nozzles, and the nozzles of adjacent pipelines are arranged in a staggered mode. The nozzle is a fine atomizing solid cone nozzle, the spraying angle of the nozzle is 70 degrees, and the spraying range of the nozzle is 450 mm. The fine atomizing solid cone nozzle can generate superfine liquid drops with the particle size range of 60-80 mu m, and the liquid drops are charged through the charging of the nozzle, so that the charging level is improved.
The superfine droplet injection device is one of the core devices of the invention, the device arranges the fine atomizing nozzles on a bracket which is vertical to the smoke direction in a staggered way, and the superfine droplets are uniformly distributed in the channel of the device and the water consumption is minimized by accurately matching the positions of the fine atomizing nozzles with the injection range of the nozzles. Superfine liquid drop spraying deviceThe sprayed superfine fog drops are combined with the superfine particles in a collision way, so that the coagulation and growth of the particles are promoted, the particle size distribution and the charge capacity of the particles are improved, the number of the superfine particles is reduced by more than 20%, and the saturated charge capacity is improved by more than 50%. The ultra-fine droplet injection device adopted in the embodiment has nine pipelines and seventy-two nozzles, the length and the width of the bracket are 4000mm, and the bracket covers 16m2The spraying amount of the area (2) is 224L/min.
The flow equalizing device combining flow resistance and flow guidance comprises a baffle with an opening, the porosity of the baffle is 50%, and the diameter of the opening is 50 mm; the porosity of the baffle plate in the middle region is less than the porosity of the edge region. The width of the baffle is 480mm, and the height of the baffle is 4000 mm. The baffles comprise spoilers 8 and flow deflectors 9, the spoilers 8 and the flow deflectors 9 are arranged adjacently and form a plurality of rhombic areas, thirty-two baffles are arranged in the embodiment to form eight rhombic areas, and the absolute values of included angles among the spoilers, the flow deflectors and the smoke direction are 30 degrees; the nearest distance between the adjacent spoilers and the center of the guide plate is not 260mm, and the nearest distance between each spoiler and the guide plate is 20 mm. The flow equalizing system combining flow blocking and flow guiding has the advantages that the flow field uniformity is remarkably improved, and simultaneously, due to the original arrangement mode, the included angle between the flow blocking plate and the flow guiding plate and the fluid speed is small, the resistance generated on airflow and the pressure drop caused by the resistance are reduced, and the operation cost of a smoke and wind system is saved.
The charge strengthening discharge device comprises a pole wire 10, wherein the pole wire 10 is arranged behind the baffle and is installed on a suspension frame 11, and the pole wire 10 is connected with a power supply 4. Be equipped with two polar lines 10 in every rhombus region, two polar lines are arranged perpendicular to air current direction respectively, and for guaranteeing electrical safety, hang frame 11 and be greater than 2.5 times of polar line 10 and spoiler 8, the spoiler 9 apart from spoiler 8, the perpendicular distance of guide plate 9, hang frame and power junction installation insulator 12, arrange heating and hot-blast device 13 that sweeps simultaneously. The temperature of the insulator is guaranteed to be above 120 ℃ through hot air blowing, the suspension frame is made of high-stress-resistant and corrosion-resistant steel, and deformation or corrosion of the frame caused by high-speed charged particles and liquid drops is prevented. The height of the suspension frame is 4000mm, sixteen polar lines are arranged in total and distributed in a diamond area of the flow equalizing device combining flow resistance and flow guidance, the distance between two adjacent polar lines is 140mm, and the vertical distance from the polar plates is 150 mm.
The high energy density power supply device (power supply) loads high density energy between the discharge device and the flow guide device through the charge intensified discharge device to generate a high-voltage electrostatic field and high-density ions, so that the charge and collision of particles and liquid drops are promoted; in order to ensure the stability of a high-voltage electrostatic field and high-density ions, a power supply is a high-voltage pulse power supply, the repetition frequency of the high-voltage pulse power supply is continuously adjustable within 0-1000 Hz, the pulse rising edge is within 20 mu s, the pulse width is within 50 mu s, the output voltage is continuously adjustable from-20 kV to-80 kV, the instantaneous pulse power reaches more than 1MW, and the energy conversion efficiency is more than 80%. Pulse generating capacitor C through high-frequency resonance charging circuitpsAnd injecting energy, wherein the high-power circuit breaker acts the energy of the pulse generating capacitor on the discharging system in a circuit breaking mode to generate a high-voltage pulse of-20 kV to-80 kV, the width of the high-voltage pulse is 40 mus, and the peak power of the high-voltage pulse is 1 MW.
The system is arranged at the inlet of the electrostatic dust collector 13, so that the flow speed deviation of flue gas entering the wet electrostatic dust collector is below 5%, the dielectric constant of particulate matters is improved by more than 50%, the actual charge of the particulate matters reaches more than 30% of the saturation capacity, the emission concentration of the particulate matters is reduced by more than 30%, and PM (particulate matter) is generated2.5The emission concentration of (2) is reduced by more than 50%. The structure is compact, and no extra space is needed; the electrostatic precipitator is arranged at an inlet of the electrostatic precipitator, a large amount of ultrafine liquid drops are sprayed to a system space, and the liquid drops are rapidly electrified by utilizing the characteristics of high charging speed and high charging quantity and are combined with particles in the flue gas in a collision way, so that the particles are charged; after the particles are combined with the liquid drops, the property is changed towards the direction beneficial to charge, the charge speed and the charge intensity are obviously improved, and the charge quantity of the particles is further improved.
Example 2
Referring to fig. 2-6, a system for enhanced removal of humidified, flow-equalizing and pre-charged particles is provided, in which an ultrafine droplet injection device 1, a flow equalizing device 2 combining flow inhibition and flow guidance, and a charge-enhanced discharge device 3 are respectively arranged in the sequence of flue gas flow direction. The air flow firstly passes through the superfine liquid drop injection device 1 and then passes through the flow equalizing device 2 combining flow resistance and flow guidance, and the distance between the superfine liquid drop injection device 1 and the flow equalizing device 2 combining flow resistance and flow guidance is 500 mm.
The liquid drop spraying device comprises a nozzle 5 and a bracket 6, the bracket is arranged perpendicular to the direction of flue gas, the bracket is provided with pipelines 7 which are parallel to each other, and the nozzle 5 is arranged on the pipeline 7; the pipeline 7 is arranged perpendicular to the direction of the flue gas, the distance between the pipelines is not more than the effective spraying distance of the nozzles 5, the spraying direction of the nozzles 5 is perpendicular to the direction of the flue gas, the nozzles on a single pipeline are uniformly distributed, the distance is not more than the effective spraying range of the nozzles, and the nozzles of adjacent pipelines are arranged in a staggered mode. The nozzle is a fine atomizing solid cone nozzle, the spraying angle of the nozzle is 70 degrees, and the spraying range of the nozzle is 450 mm. The fine atomizing solid cone nozzle can generate superfine liquid drops with the particle size range of 60-80 mu m, and the liquid drops are charged through the charging of the nozzle, so that the charging level is improved. In the present embodiment, the ultra-fine droplet spraying system has six pipes and thirty nozzles, and the length and width of the bracket are 2500mm and cover 6.25m2The spraying amount of the area (2) is 100L/min, so that the dielectric constant of the particles can be improved by more than 30%.
The flow equalizing device combining flow resistance and flow guide comprises a baffle with openings, the baffle adopts a layer of opening guide plate 9 vertical to the smoke gas, the porosity is 50%, and the diameter of an opening 14 is 100 mm; the porosity of the middle region of the baffle is less than the porosity of the edge region. The width of the guide plate is 2500mm, and the height of the guide plate is 2500 mm. After passing through the guide plate, the flow speed deviation of the flue gas is reduced to below 10 percent.
The charge strengthening discharge device comprises a pole wire 10, wherein the pole wire 10 is arranged behind the baffle and is installed on a suspension frame 11, and the pole wire 10 is connected with a power supply 4. An insulator 12 is arranged at the joint of the suspension frame and a power supply, and a heating and hot air blowing device 13 is arranged at the same time. The temperature of the insulator is guaranteed to be above 120 ℃ through hot air blowing, the suspension frame is made of high-stress-resistant and corrosion-resistant steel, and deformation or corrosion of the frame caused by high-speed charged particles and liquid drops is prevented. The height of the frame in the embodiment is 2500mm, ten polar lines are arranged in total, the distance between two adjacent polar lines is 140mm, and the vertical distance from the polar plate is 150 mm.
The high energy density power supply device is connected in the same form as the first embodiment, high-voltage pulses of-20 kV to-80 kV are generated, the width is 40 mus, but the embodiment is compact, the peak power of the pulses is 0.7MW, and the charge capacity of the particles can reach more than 15% of the saturated charge capacity.
In the embodiment, the arrangement is carried out in the limited space of the front flue of the wet electrostatic dust collector, so that the flow speed deviation of the flue gas entering the wet electrostatic dust collector is below 10%, the dielectric constant of particulate matters is improved by more than 30%, the actual charge capacity of the particulate matters reaches more than 15% of the saturation capacity, the emission concentration of the particulate matters is reduced by more than 15%, and PM2.5The emission concentration of (2) is reduced by more than 25%.
Claims (4)
1. The utility model provides a humidification flow equalizing is electric particulate matter reinforce desorption system in advance which characterized in that: the system is arranged at an inlet of the electrostatic dust collector and sequentially comprises a liquid drop injection device, a flow equalizing device combining flow resistance and flow guidance and a charge-enhanced discharge device along the smoke direction, wherein the liquid drop injection device comprises a nozzle and a bracket, the bracket is arranged perpendicular to the smoke direction, the bracket is provided with mutually parallel pipelines, and the nozzle is arranged on the pipeline; the flow equalizing device combining flow resistance and flow guidance comprises a baffle with openings, the porosity of the baffle is between 40% and 50%, and the diameter of each opening is between 30mm and 60 mm; the baffle comprises a spoiler and a guide plate, the spoiler and the guide plate are arranged adjacently and form a plurality of diamond-shaped areas; the charge enhanced discharge device comprises polar lines, wherein the polar lines are arranged behind the baffle and are arranged on the suspension frame, two polar lines are arranged in each diamond area, the distance between the two polar lines is 140mm to 150mm, the two polar lines are respectively arranged in a direction perpendicular to the airflow direction, the perpendicular distances between the polar lines and the flow baffle and between the polar lines and the flow guide plate are 130mm to 160mm, and the polar lines are connected with a power supply;
the power supply is a resonance inversion high-frequency direct-current power supply or a high-voltage pulse power supply, the rated frequency of the resonance inversion high-frequency direct-current power supply is above 20kHz, the output voltage is continuously adjustable from 0kV to-60 kV, the effective power reaches above 30kW, and the energy efficiency is above 95%; the repetition frequency of the high-voltage pulse power supply is continuously adjustable within 0-1000 Hz, the pulse rising edge is within 20 mus, the pulse width is within 50 mus, the output voltage is continuously adjustable within-20 kV to-80 kV, the instantaneous pulse power reaches more than 1MW, and the energy conversion efficiency is more than 80%;
the pipelines are arranged perpendicular to the direction of the flue gas, the distance between the pipelines is not more than the effective spraying distance of the nozzles, the spraying direction of the nozzles is perpendicular to the direction of the flue gas, the nozzles on a single pipeline are uniformly distributed, the distance is not more than the effective spraying range of the nozzles, and the nozzles of adjacent pipelines are arranged in a staggered manner;
the nozzle is a fine atomization solid cone nozzle, the flow rate is 2-3L/min, the spraying angle of the nozzle is 60-80 degrees, and the spraying range of the nozzle is 400-500 mm;
the distance between the liquid drop spraying device and the flow equalizing device combining flow resistance and flow guidance is more than 500 mm.
2. The system for enhanced removal of humidified, flow-equalizing and pre-charged particulates of claim 1, wherein: the width of the baffle is 480mm, and the absolute value of the included angle between the flow baffle, the flow guide plate and the smoke direction is 30-40 degrees; the nearest distance between the centers of the adjacent spoilers and the guide plate is 220mm to 280mm, and the nearest distance between each spoiler and the guide plate is 15mm to 25 mm.
3. The system for enhanced removal of humidified, flow-equalizing and pre-charged particulates of claim 1, wherein: the porosity of the baffle plate in the middle region is less than the porosity of the edge region.
4. The system for enhanced removal of humidified, flow-equalizing and pre-charged particulates of claim 1, wherein: the distance between the suspension frame and the spoiler and between the suspension frame and the power supply are 2.5 times longer than the distance between the suspension frame and the spoiler and between the suspension frame and the power supply, and the heating and hot air blowing device is arranged at the joint of the suspension frame and the power supply.
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| CN109821654B (en) * | 2019-01-25 | 2021-07-20 | 东南大学 | System and method for deeply removing fine particulate matters/soluble salt/sulfur trioxide in flue gas after wet desulphurization |
| CN109806975B (en) * | 2019-01-30 | 2024-03-01 | 浙江大学 | Reinforced uniform discharge device and method |
| CN114144261B (en) * | 2019-05-17 | 2024-05-28 | 怡色公司 | Apparatus and method for managing fine particle concentration |
| CN112108268A (en) * | 2019-06-19 | 2020-12-22 | 中国石油化工股份有限公司 | Wet-type electric precipitation demister, treatment method and application thereof |
| CN111852615A (en) * | 2020-07-21 | 2020-10-30 | 扬州大学 | Small-sized diesel engine carbon particle removing device in extremely cold environment and working method thereof |
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