CN108097463A - A kind of energy-efficient electric precipitator - Google Patents
A kind of energy-efficient electric precipitator Download PDFInfo
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- CN108097463A CN108097463A CN201810049156.7A CN201810049156A CN108097463A CN 108097463 A CN108097463 A CN 108097463A CN 201810049156 A CN201810049156 A CN 201810049156A CN 108097463 A CN108097463 A CN 108097463A
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- 239000012716 precipitator Substances 0.000 title abstract description 13
- 239000000428 dust Substances 0.000 claims abstract description 131
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 76
- 239000003546 flue gas Substances 0.000 claims abstract description 76
- 238000009434 installation Methods 0.000 claims abstract description 20
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 239000011148 porous material Substances 0.000 claims description 23
- 239000012717 electrostatic precipitator Substances 0.000 claims description 12
- 239000000779 smoke Substances 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 abstract description 8
- 239000007789 gas Substances 0.000 abstract description 3
- 230000008676 import Effects 0.000 description 10
- 239000003245 coal Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000002349 favourable effect Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrostatic Separation (AREA)
Abstract
The present invention discloses a kind of energy-efficient electric precipitator, and including housing, electric precipitation component and heat-exchanging component are equipped in the housing, and the heat-exchanging component includes several set of heat exchange tubes, and positioned at the upstream of the electric precipitation component；If the lower section of the electric precipitation component is equipped with the dry ash bucket being spaced apart along the flow direction of flue gas, rectification orifice plate is vertically equipped in each ash bucket.Energy-efficient electric precipitator provided by the present invention, traditional low-level (stack-gas) economizer is integrated in one with electric precipitator, to have both recovered flue gas heat, reduce the multiple functions such as dust specific resistance and flue gas ash removal, the low-level (stack-gas) economizer and electric precipitator independently set in compared with prior art, the energy-efficient electric precipitator can significantly reduce the installation space of flue gas dust collecting system, efficiency of dust collection is improved, and reduces running resistance；Rectification orifice plate is additionally provided in each ash bucket of the energy-efficient electric precipitator, each ash bucket interior flow field can be evenly distributed with, largely to avoid the secondary fly-up of dust inside ash bucket.
Description
Technical Field
The invention relates to the technical field of flue gas dust removal, in particular to an energy-saving and efficient electric dust remover.
Background
Electric precipitation is a dust removal mode commonly used, has multiple advantages such as the dust collection efficiency is high, the processing gas scope volume is big, for further improving electric precipitator's dust collection efficiency, there are two kinds of technical scheme at present mainly: 1) the flow field distribution in the electric dust collector is improved; 2) the specific resistance of the dust is reduced.
According to the general knowledge in the art, the more uniform the air flow distribution inside the electrostatic precipitator, which is mainly referred to as the inlet horn and the air flow distribution upstream of the electric field, the higher the efficiency of the electrostatic precipitator. To this, the common scheme among the prior art sets up the orifice plate that is used for the equipartition air current in the import loudspeaker, and the quantity of this orifice plate is more, and the inside air current distribution of electrostatic precipitator is just more even, is favorable to improving dust collection efficiency more, but correspondingly, the inside circulation resistance of electrostatic precipitator can be big more, and electrostatic precipitator's running cost can improve by a wide margin.
The scheme of reducing the specific resistance of the dust mainly means that a low-temperature economizer is arranged in a flue so as to reduce the temperature of the flue gas to be treated. The low-temperature economizer is internally provided with a plurality of heat exchange tubes, and in order to improve the heat exchange efficiency, the section size of the low-temperature economizer is usually larger than that of a flue so as to reduce the flow velocity of flue gas. That is, the size of the cross section of the low-temperature economizer cannot be too large, so that the size of the low-temperature economizer in the airflow direction and the number of heat exchange tube sets need to be increased to ensure a sufficient heat exchange area, which can also increase the running resistance of the low-temperature economizer, and can also increase the installation space and the installation cost of the low-temperature economizer; alternatively, perforated plates for distributing the air flow can also be provided in the reducer section, but this also increases the running resistance.
Therefore, how to provide a novel electric dust collector to improve the dust collection efficiency and reduce the running resistance is still a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an energy-saving high-efficiency electric dust remover, which integrates a traditional low-temperature coal economizer and an electric dust remover which are independently arranged into a whole, can greatly reduce the installation space of the whole flue gas dust removal system, can also improve the dust removal efficiency and reduce the running resistance; in addition, a rectification pore plate is further arranged in each ash bucket of the energy-saving and high-efficiency electric dust collector, so that the internal flow fields of the ash buckets can be uniformly distributed, and secondary flying of dust in the ash buckets is avoided to a great extent.
In order to solve the technical problems, the invention provides an energy-saving high-efficiency electric dust remover which comprises a shell, wherein an electric dust removing component and a heat exchange component are arranged in the shell, and the heat exchange component comprises a plurality of heat exchange pipe sets and is positioned at the upstream of the electric dust removing component; the lower side of electric precipitation subassembly is equipped with along the flow direction interval distribution's of flue gas a plurality of ash buckets, all along the vertical rectification orifice plate that is equipped with in each ash bucket.
Compared with the low-temperature coal economizer and the electric dust remover which are respectively and independently arranged in the prior art, the energy-saving high-efficiency electric dust remover also has the advantages in the following aspects:
1) the cross-sectional dimension of the energy-saving high-efficiency electric dust remover is far larger than that of a traditional independently arranged low-temperature economizer, the flow velocity of flue gas is low, a good heat exchange environment is provided for a heat exchange assembly, the heat exchange efficiency can be greatly improved under the condition of the same heat exchange area, meanwhile, the flow velocity of dust in the flue gas is low, and the abrasion of a heat exchange pipe can be greatly reduced;
2) similarly, because the cross section of the energy-saving high-efficiency electric dust remover is larger, the heat exchange assembly does not need to greatly increase the number of heat exchange tube sets along the flow direction of flue gas during installation, and the heat exchange area and the heat exchange efficiency can be ensured, so that on one hand, the installation space of the electric dust remover is not greatly increased due to the fact that the heat exchange assembly is additionally arranged in the electric dust remover, and in fact, compared with a low-temperature economizer, the electric dust remover and a flue connected between the low-temperature economizer and the electric dust remover which are independently arranged in the prior art, the installation space of the energy-saving high-efficiency electric dust remover provided by the invention is greatly reduced, the production, installation and use costs of the whole flue gas dust removal system are greatly reduced;
3) locate a plurality of heat exchange tube groups in electric precipitation subassembly upper reaches and can also play the effect of equipartition air current, need not to set up too much orifice plate in the energy-conserving high-efficient electrostatic precipitator import loudspeaker, can reach the effect of air current equipartition, not only be favorable to the dust removal of flue gas, still can further reduce the running resistance of flue gas.
In addition, the energy-saving and high-efficiency electric dust remover is characterized in that a rectification pore plate is arranged in each ash bucket, on one hand, smoke in each ash bucket can be blocked to reduce the smoke amount in each ash bucket, so that the smoke flows into the electric dust removing assembly as much as possible for dust removal, on the other hand, the smoke in each ash bucket can be uniformly distributed to reduce eddy current in each ash bucket, reduce the flow velocity of the smoke in the ash bucket, and avoid secondary flying of dust in the ash bucket to a greater extent.
Optionally, the housing has an inlet horn, and the heat exchange assembly is disposed at a downstream end of the inlet horn; or, the heat exchange assembly is located between the inlet horn and the electric dust removal assembly.
Optionally, the inlet horn comprises a first diameter-enlarging section and a diameter-enlarging section, one end of the first diameter-enlarging section is connected with an external flue, the other end of the first diameter-enlarging section is connected with the diameter-enlarging section, and the joint of the first diameter-enlarging section and the diameter-enlarging section is in smooth transition.
Optionally, an evenly distributed airflow pore plate is arranged in the diameter expanding section, and a dust guide seam is arranged between the evenly distributed airflow pore plate and the lower wall surface of the diameter expanding section.
Optionally, a flow baffle is further arranged on the lower wall surface of the diameter expansion section, and the flow baffle is located at the downstream of the ash guiding seam so as to block the flue gas flowing out of the ash guiding seam; the flow baffle is also provided with a plurality of ash guide openings.
Optionally, a spoiler is arranged between two adjacent ash hoppers, and the height of each spoiler gradually increases along the flow direction of the flue gas.
Optionally, an included angle between a top connecting line of two adjacent spoilers and a horizontal plane is within 5 degrees.
Optionally, the housing further has an outlet horn, the outlet horn includes a second constant diameter section and a reduced diameter section, and a junction of the second constant diameter section and the reduced diameter section is in smooth transition.
Optionally, a plurality of groups of trough plate rows are arranged in the reducing section, and the distance between two adjacent trough plates of each trough plate row is matched with the flue gas flow rate at the installation position of the trough plate row.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an energy-saving and high-efficiency electric dust collector provided by the invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an expanded view of the baffle of FIG. 2;
FIG. 4 is a top view of FIG. 1;
FIG. 5 is a schematic view of the distribution of the slot die rows at the outlet horn;
FIG. 6-a is a velocity contour plot of flue gas in a combined structure of a conventional electric precipitator and a low-temperature economizer;
FIG. 6-b is a velocity contour plot of flue gas in the energy-saving and high-efficiency electric precipitator provided by the present invention;
FIG. 7-a is a flow state diagram of flue gas in a combined structure of a conventional electric precipitator and a low-temperature economizer;
FIG. 7-b is a diagram showing the flow state of flue gas in the energy-saving and high-efficiency electric dust collector provided by the present invention;
FIG. 8-a is a diagram showing the flow state of flue gas in an ash hopper of a conventional electric precipitator;
FIG. 8-b is a diagram showing the flow state of the flue gas in the ash hopper of the energy-saving and high-efficiency electric dust remover provided by the invention.
The reference numerals in fig. 1 to 8-b are illustrated as follows:
1, a shell, 11 inlet horns, 111 first equal-diameter sections, 112 expanding sections, 12 outlet horns, 121 second equal-diameter sections, 122 reducing sections and 13 ash hoppers;
2, an electric dust removal component;
3, a heat exchange assembly;
4, uniformly distributing airflow pore plates and 41 dust guide seams;
5, a flow baffle plate and a 51 ash guide port;
6, rectifying an orifice plate;
7 a spoiler;
8 groove type plate rows.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As used herein, the term "plurality" refers to an indefinite number of plural, usually more than two; and when the number of "a few" is used to indicate the number of some of the components, it does not indicate that the number of these components is the same.
The terms "first," "second," and the like, herein are used for convenience in describing two or more structures or components that are the same or similar in structure, and do not denote any particular order or order.
Referring to fig. 1 to 5, fig. 1 is a schematic structural diagram of an embodiment of an energy-saving and efficient electric dust collector provided by the present invention, fig. 2 is a partially enlarged view of a position a in fig. 1, fig. 3 is an expanded view of a baffle plate in fig. 2, fig. 4 is a top view of fig. 1, and fig. 5 is a schematic distribution diagram of a slot-type plate row at an outlet horn.
As shown in fig. 1 and 4, the invention provides an energy-saving high-efficiency electric dust remover, which comprises a shell 1, wherein an electric dust removing assembly 2 and a heat exchange assembly 3 are arranged in the shell 1, and the heat exchange assembly 3 comprises a plurality of heat exchange pipe sets and is positioned at the upstream of the electric dust removing assembly 2. It can be understood that the heat exchange assembly 3 corresponds to a low-temperature economizer in the prior art.
That is, the present invention provides a novel electric dust collector which can integrate a conventional low-temperature coal economizer and an electric dust collector into a whole, and which can simultaneously have a plurality of functions of recovering flue gas heat, reducing dust specific resistance, removing dust from flue gas, etc., and in addition, compared with the low-temperature coal economizer and the electric dust collector which are respectively and independently arranged in the prior art, the energy-saving high-efficiency electric dust collector also has the following advantages:
1) the cross-sectional size of the energy-saving high-efficiency electric dust remover is far larger than that of a traditional independently-arranged low-temperature economizer, the flow velocity of flue gas in the energy-saving high-efficiency electric dust remover is low and is only 4-5m/s at most, a good heat exchange environment is provided for the heat exchange assembly 3, the heat exchange efficiency can be greatly improved under the condition of the same heat exchange area, meanwhile, the flow velocity of dust in the flue gas is low, and the abrasion of a heat exchange pipe can be greatly reduced;
2) similarly, because the cross-sectional dimension of the energy-saving high-efficiency electric dust remover is larger, the heat exchange assembly 3 can ensure the heat exchange area and the heat exchange efficiency without greatly increasing the number of the heat exchange tube sets along the flow direction of the flue gas when being installed, so that on one hand, the installation space of the energy-saving high-efficiency electric dust remover is not greatly increased due to the additionally arranged heat exchange assembly 3 in the energy-saving high-efficiency electric dust remover, and in fact, compared with a low-temperature coal economizer, an electric dust remover and a flue connected between the low-temperature coal economizer and the electric dust remover which are independently arranged in the prior art, the installation space of the energy-saving high-efficiency electric dust remover is greatly reduced, the production, installation and use costs of the whole flue gas dust removal system can be greatly;
3) locate a plurality of heat exchange tube groups in 2 upper reaches of electricity precipitation subassembly and can also play the effect of equipartition air current, need not to set up too much orifice plate in energy-conserving high-efficient electrostatic precipitator import loudspeaker 11, can reach the effect of air current equipartition, not only be favorable to improving the dust collection efficiency of flue gas, still can further reduce the running resistance of flue gas.
Experiments prove that compared with a low-temperature economizer and an electric dust remover which are independently arranged in the prior art, the energy-saving high-efficiency electric dust remover provided by the invention has the advantages that the running resistance of flue gas is reduced by more than 60%, and the energy consumption of a system can be greatly reduced.
Referring to fig. 1, the housing 1 may have an inlet horn 11, and the heat exchange assembly 3 may be disposed in the inlet horn 11, so as to further reduce the increase in volume of the energy-saving and high-efficiency electric precipitator caused by the addition of the heat exchange assembly 3. Particularly, heat exchange assembly 3 can be located the downstream end portion of import loudspeaker 11, reflects in the attached drawing, the right-hand member portion of import loudspeaker 11 promptly for heat exchange assembly 3 can be located the lower region of velocity of flow in the import loudspeaker 11, with provide better heat transfer environment for heat exchange assembly 3 as far as possible, thereby guarantee heat exchange efficiency.
Or, also can install heat exchange assembly 3 between import loudspeaker 11 and electrostatic precipitator subassembly 2, be about to heat exchange assembly 3 install inside energy-conserving high-efficient electrostatic precipitator main part, compare in import loudspeaker 11, the flue gas is lower at the inside velocity of flow of energy-conserving high-efficient electrostatic precipitator main part, more is favorable to improving heat exchange efficiency.
The inlet horn 11 may include a first equal-diameter section 111 and an expanding section 112, one end of the first equal-diameter section 111 may be connected to an external flue, and the radial dimension of the first equal-diameter section is substantially the same as the external flue, so as to reduce the phenomenon of flue gas flow disturbance caused by the change of the cross-sectional dimension as much as possible, the other end may be connected to the expanding section 112, and the joint of the first equal-diameter section and the expanding section may be in smooth transition, i.e. there is no obvious diagonal angle, so as to reduce the possibility of generating vortex at the joint of the first equal-diameter section and the expanding section, and at the same time, the dust.
The expanding section 112 may be substantially conical, and a generatrix thereof may be a straight line, in which case, the entire expanding section 112 may be approximated to a circular truncated cone, or may be a curved line such as a parabola, a hyperbola, an arc, or an elliptic arc. In the embodiment of the present invention, the generatrix of the expanding section 112 is preferably a smooth curve, so that the whole inlet horn 11 is streamline, the flue gas in the flue can enter the inlet horn 11 more smoothly, the erosion and wear of the flue gas on the inner wall surface of the inlet horn 11 can be reduced, and the flue gas is favorably and uniformly distributed.
Further, the diameter expanding section 112 may be further provided with uniformly distributed airflow hole plates 4 to improve the uniformity of the flow field distribution to a greater extent. Because the heat exchange component 3 and the streamline inlet horn 11 have already performed the function of uniform airflow to a certain extent, in the embodiment of the invention, only a small number of uniformly distributed airflow pore plates 4 are used, for example, only one layer of uniformly distributed airflow pore plates 4 can be used, so that the technical effect of uniform airflow distribution can be met, and the reduction of the running resistance of the flue gas is facilitated.
It should be known that, in prior art, will set up three-layer equipartition air current orifice plate 4 at least in the import loudspeaker 11, and in order to guarantee low temperature economizer's heat exchange efficiency, low temperature economizer's import also sets up equipartition air current orifice plate 4 more than the one deck at least, that is to say, in prior art, get into the inside flue gas of electrostatic precipitator and need block through heat exchange component 3 in at least four layers of equipartition air current orifice plate 4 and the low temperature economizer. For the novel energy-saving high-efficiency electric dust remover provided by the invention, the flue gas can enter the energy-saving high-efficiency electric dust remover only through the layer of uniformly distributed airflow pore plates 4 and the heat exchange assembly 3 formed by a small number of heat exchange pipe sets, so that the running resistance of the flue gas can be effectively reduced, and the energy consumption is further reduced.
In addition, in the prior art, when a plurality of layers of uniformly distributed airflow pore plates 4 are arranged, the aperture ratio of each uniformly distributed airflow pore plate 4 is different, and when the device is installed on site, because the cross-sectional dimension of the inlet horn 11 is larger, each uniformly distributed airflow pore plate 4 needs to be formed by welding and assembling a plurality of sub pore plates, so that dozens of sub pore plates with different aperture ratios exist on the installation site, the situation that the sub pore plates are mistakenly taken to cause that the uniformly distributed airflow pore plates 4 are not installed according to the predetermined designed aperture ratio is very likely to occur during installation, and the uniformity of the airflow distribution inside the electric dust collector is seriously influenced.
In the embodiment of the invention, the number of the uniformly distributed airflow pore plates 4 only needs to be one layer, so that only one pore distribution plate with the opening rate exists in an installation field, and the situation of installation error of the pore distribution plate in the prior art can be perfectly avoided. The aperture ratio of the uniformly distributed airflow aperture plate 4 used in the embodiment of the invention is between 30% and 50%, and of course, other values can be set, and the aperture ratio can be determined according to actual use requirements.
Still taking fig. 1 as a view point, in order to determine the installation position of the uniformly distributed airflow orifice plates 4, a bending section may be provided on the upper wall surface of the downstream end portion of the inlet horn 11, and the bending section may make the upper wall surface form a break angle at which the uniformly distributed airflow orifice plates 4 are installed.
It can be understood that the uniformly distributed air flow pore plate 4 can block larger particle dust in the flue gas besides the function of improving the flow field distribution. As shown in fig. 2 and with reference to fig. 1, in order to prevent the dust blocked by the uniformly distributed airflow orifice plate 4 from accumulating between the lower end of the uniformly distributed airflow orifice plate 4 and the inner wall surface of the inlet horn 11, a dust guide slit 41 may be provided between the lower end of the uniformly distributed airflow orifice plate 4 and the inner wall surface of the diameter expansion section 112, and the dust blocked by the uniformly distributed airflow orifice plate 4 may slide into the energy-saving and efficient electric dust collector along the inner wall surface of the inlet horn 11 through the dust guide slit 41, and then be collected by the dust hopper 13.
The number of the dust guiding slits 41 may be one or more, and specifically may be a gap formed at the lower end of the uniformly distributed airflow orifice plate 4, or a gap between the lower end of the uniformly distributed airflow orifice plate 4 and the inner wall surface of the diameter expanding section 112.
Furthermore, the lower wall surface of the expanding section 112 may further be provided with a flow baffle 5, and the flow baffle 5 is located downstream of the dust guiding slit 41 to block the flue gas flowing out from the dust guiding slit 41, so as to largely prevent the jet flow formed at the dust guiding slit 41 from damaging the uniformity of the air flow inside the electric field and causing abrasion to the heat exchange tube set.
The baffle 5 may also be provided with several dust guiding openings 51, through which dust flowing out from the dust guiding slits 41 can be discharged through the dust guiding openings 51 to avoid dust accumulation at the baffle 5. The ash guide opening 51 may be a groove-shaped opening, and is specifically disposed at the upper end and/or the lower end of the flow baffle 5, at this time, the upper end and/or the lower end of the flow baffle 5 may be zigzag or wavy for discharging ash; alternatively, the dust guide openings 51 may be of a hole type, and the dust guide openings 51 may be spaced apart from each other in the extending direction of the baffle 5 (i.e., in the circumferential direction of the expanded diameter section 112).
The improvement is mainly to adjust the internal flow field of the inlet horn 11, that is, the flow field (hereinafter referred to as front end flow field) in front of the electric dust removal assembly 2, which is also a flow field concerned in the prior art. In practice, in addition to the front-end flow field, the uniformity of the bypass flow field formed between the dust hoppers 13 below the electric dust removing assembly 2 and the uniformity of the end flow field between the electric dust removing assembly 2 and the outlet trumpet 12 also have a great influence on the improvement of the dust removing efficiency.
Aiming at the bypass flow field, the ash buckets 13 are internally provided with the rectifying pore plates 6 along the vertical direction, and the aperture ratio of the rectifying pore plates 6 is 20-60%. So set up, on the one hand, this rectification orifice plate 6 can block the flue gas in the bypass flow field to reduce the flue gas volume in the bypass flow field, make the flue gas flow into the main flow field of each electric precipitation subassembly 2 as much as possible and remove dust, on the other hand, this rectification orifice plate 6 can also carry out the rectification to the flue gas in the bypass flow field, with the flue gas in the equipartition bypass flow field as far as possible, alleviate the vortex among each ash bucket 13, and reduce the flue gas velocity in the ash bucket 13, and then can avoid the secondary of the inside dust of ash bucket 13 to fly upward to a great extent.
The spoiler 7 can be arranged between the two adjacent ash hoppers 13, and besides being used for blocking smoke in a bypass flow field, the spoiler 7 can also block part of dust flying out of the ash hoppers 13, so that the part of dust falls into the ash hoppers 13 again to be collected, and then the dust escape caused by secondary flying can be reduced.
Further, along the flow direction of the flue gas, the height of each spoiler 7 can be gradually increased so as to adapt to the trend that the flue gas in the energy-saving and high-efficiency electric dust collector integrally flows upwards and enters the outlet loudspeaker 12. Here, the embodiment of the present invention does not limit the height increase amplitude of each spoiler 7, and is specifically related to various parameters such as the length of the electric field inside the energy-saving and high-efficiency electric dust collector, the number of the ash buckets 13 and the like; generally, the angle between the top connecting line of two adjacent baffles 7 and the horizontal plane can be set to be not more than 5 degrees, and the last baffle 7 can extend into the electric field in the flow direction of the flue gas.
For the end flow field, the housing 1 may further have an outlet horn 12, the outlet horn 12 may include a second equal-diameter section 121 and a reduced-diameter section 122, one end of the second equal-diameter section 121 may be connected to an external flue, and a radial dimension of the second equal-diameter section 121 is substantially the same as that of the external flue, so as to reduce the disturbance of the end flow field caused by the change of the cross-sectional dimension as much as possible, the other end may be connected to the reduced-diameter section 122, and a joint of the two may be in smooth transition, so as to reduce the possibility of generating a vortex at the joint of the.
The reduced diameter section 122 may be substantially conical, and the generatrix may be a straight line, in which case, the entire reduced diameter section 122 may approximate a circular truncated cone, or may be a curved line, such as a parabola, a hyperbola, an arc, or an elliptic arc. In the embodiment of the present invention, the generatrix of the diameter-reduced section 122 is preferably a smooth curve, so that the outlet horn 12 is streamline as a whole, the flue gas inside the energy-saving and high-efficiency electric dust collector can flow out from the outlet horn 12 more smoothly, the erosion and wear of the flue gas on the inner wall surface of the outlet horn 12 can be reduced, and the flue gas is favorably and uniformly distributed.
The reducing section 122 is internally provided with a plurality of groups of groove-shaped plate rows 8, the distance between two adjacent groove-shaped plates of each groove-shaped plate row 8 is matched with the flue gas flow velocity at the installation position of the groove-shaped plate row 8, and the matching of the distance between two adjacent groove-shaped plates and the flue gas flow velocity means that the distance between two adjacent groove-shaped plates is in a corresponding relation with the flue gas flow velocity, specifically, the distance between two adjacent groove-shaped plates at the position where the flue gas flow velocity is large can be small, and the distance between two adjacent groove-shaped plates at the position where the flue gas flow velocity is small can be large, so as to.
In this case, the embodiment of the present invention does not limit the explicit relationship between the distance between two adjacent slotted plates and the flow rate of the flue gas, and the specific requirement is determined by combining the actual situation. As shown in fig. 5, through research and study, the flow velocity of the flue gas on the longitudinal section of the outlet horn 12 can be roughly divided into B, C, D three levels, the three levels are distributed in a shape of a nine-grid, and in the corresponding area, each trough plate row 8 can be arranged according to the corresponding relation between the flow velocity of the flue gas and the distance between the trough plates.
It should be known that, in the prior art, in order to ensure the uniformity of the end flow field, at least two layers of the slotted plate rows 8 are required to be arranged along the flow direction of the flue gas to ensure the uniformity of the end flow field, and after the scheme in the embodiment of the invention is adopted, the installation number of the slotted plate rows 8 in the end flow field can be greatly reduced, the effect of uniformly distributing the flow field can be better realized only by arranging one layer, so that not only can the material be greatly saved, but also the flow resistance of the flue gas can be favorably reduced, and the energy consumption can be further reduced.
The reducing section 122 may also be provided with a perforated plate with inconsistent opening rate to adjust the airflow distribution of the end flow field, but in comparison, the arrangement of the slotted plate 8 is more favorable for reducing the smoke resistance, which is a preferred scheme of the embodiment of the present invention.
Referring to fig. 6-a to 8-b, fig. 6-a is a graph of the equal velocity of the flue gas in the combined structure of the conventional electric dust collector and the low-temperature coal economizer, fig. 6-b is a graph of the equal velocity of the flue gas in the energy-saving high-efficiency electric dust collector provided by the present invention, fig. 7-a is a graph of the flow state of the flue gas in the combined structure of the conventional electric dust collector and the low-temperature coal economizer, fig. 7-b is a graph of the flow state of the flue gas in the energy-saving high-efficiency electric dust collector provided by the present invention, fig. 8-a is a graph of the flow state of the flue gas in the ash bucket of the conventional electric dust collector, and fig. 8-b is a graph of the flow state of the flue gas.
As shown in fig. 6-a to 8-b, after the energy-saving and high-efficiency electric dust remover provided by the invention is adopted, the distribution of flue gas in the energy-saving and high-efficiency electric dust remover is more uniform, the flowing state is more stable, and eddy currents do not exist basically, and especially, the problem of secondary flying of dust in the dust hoppers 13 can be basically and completely overcome by the bypass flow fields in the dust hoppers 13.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (9)
1. An energy-saving high-efficiency electric dust remover is characterized by comprising a shell (1), wherein an electric dust removing assembly (2) and a heat exchange assembly (3) are arranged in the shell (1), and the heat exchange assembly (3) comprises a plurality of heat exchange pipe sets and is positioned at the upstream of the electric dust removing assembly (2);
the below of electrostatic precipitator subassembly (2) is equipped with along a plurality of ash buckets (13) of the flow direction interval distribution of flue gas, all along vertical rectification orifice plate (6) that are equipped with in each ash bucket (13).
2. The energy-saving and high-efficiency electric dust collector as claimed in claim 1, wherein the shell (1) is provided with an inlet horn (11), and the heat exchange assembly (3) is arranged at the downstream end part of the inlet horn (11); or,
the heat exchange assembly (3) is located between the inlet horn (11) and the electric dust removal assembly (2).
3. The energy-saving and high-efficiency electric dust collector as claimed in claim 2, wherein the inlet horn (11) comprises a first diameter-enlarging section (111) and a diameter-enlarging section (112), one end of the first diameter-enlarging section (111) is connected with an external flue, the other end of the first diameter-enlarging section is connected with the diameter-enlarging section (112), and the joint of the first diameter-enlarging section and the diameter-enlarging section is in smooth transition.
4. The energy-saving high-efficiency electric dust collector as claimed in claim 3, wherein an evenly distributed airflow pore plate (4) is arranged in the diameter expanding section (112), and dust guide slits (41) are formed between the evenly distributed airflow pore plate (4) and the lower wall surface of the diameter expanding section (112).
5. The energy-saving and high-efficiency electric dust collector as claimed in claim 4, wherein a flow baffle (5) is further arranged on the lower wall surface of the diameter expanding section (112), and the flow baffle (5) is located at the downstream of the dust guiding gap (41) to block the smoke flowing out of the dust guiding gap (41);
the flow baffle (5) is also provided with a plurality of ash guide openings (51).
6. The energy-saving and high-efficiency electric dust collector as claimed in any one of claims 1 to 5, wherein flow baffles (7) are arranged between two adjacent ash hoppers (13), and the height of each flow baffle (7) is gradually increased along the flow direction of flue gas.
7. The energy-saving and high-efficiency electric dust collector as claimed in claim 6, wherein the included angle between the top connecting line of two adjacent spoilers (7) and the horizontal plane is within 5 degrees.
8. The energy-saving and high-efficiency electric dust collector as claimed in claim 6, wherein the housing (1) is further provided with an outlet horn (12), the outlet horn (12) comprises a second equal-diameter section (121) and a reduced-diameter section (122), and the junction of the second equal-diameter section (121) and the reduced-diameter section (122) is in smooth transition.
9. The energy-saving and high-efficiency electric dust collector as claimed in claim 8, wherein a plurality of groups of slotted plate rows (8) are arranged in the reducing section (122), and the distance between two adjacent slotted plates of each slotted plate row (8) is matched with the flue gas flow velocity at the installation position of the slotted plate row (8).
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| CN201810049156.7A CN108097463A (en) | 2018-01-18 | 2018-01-18 | A kind of energy-efficient electric precipitator |
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| CN201810049156.7A CN108097463A (en) | 2018-01-18 | 2018-01-18 | A kind of energy-efficient electric precipitator |
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| CN108097463A true CN108097463A (en) | 2018-06-01 |
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| CN201810049156.7A Pending CN108097463A (en) | 2018-01-18 | 2018-01-18 | A kind of energy-efficient electric precipitator |
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| CN109499765A (en) * | 2018-12-19 | 2019-03-22 | 宜兴市爱迪尔科技有限公司 | Turn-back flow high-efficiency electrical dust collector device |
| CN110508077A (en) * | 2019-07-30 | 2019-11-29 | 重庆科技学院 | Dry garbage flying ash based on garbage classification flying dust purification system purifies control method |
| CN111097251A (en) * | 2019-12-13 | 2020-05-05 | 华电电力科学研究院有限公司 | Device and method for efficiently removing fine particles in multi-field subareas |
| CN112444135A (en) * | 2020-10-30 | 2021-03-05 | 四川凤生纸业科技股份有限公司 | Process and system for purifying flue gas discharged by alkali furnace |
| CN112452544A (en) * | 2020-11-18 | 2021-03-09 | 江苏绿都环境工程有限公司 | Low-low temperature electric dust remover |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112444135A (en) * | 2020-10-30 | 2021-03-05 | 四川凤生纸业科技股份有限公司 | Process and system for purifying flue gas discharged by alkali furnace |
| CN112452544A (en) * | 2020-11-18 | 2021-03-09 | 江苏绿都环境工程有限公司 | Low-low temperature electric dust remover |
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