CN104258993A - Air distribution device and flue gas dust removal equipment provided with same - Google Patents
Air distribution device and flue gas dust removal equipment provided with same Download PDFInfo
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- CN104258993A CN104258993A CN201410545056.5A CN201410545056A CN104258993A CN 104258993 A CN104258993 A CN 104258993A CN 201410545056 A CN201410545056 A CN 201410545056A CN 104258993 A CN104258993 A CN 104258993A
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- heat exchanger
- distribution device
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 239000003546 flue gas Substances 0.000 title claims abstract description 97
- 239000000428 dust Substances 0.000 title claims abstract description 30
- 239000007789 gas Substances 0.000 claims description 43
- 239000000779 smoke Substances 0.000 claims description 33
- 235000019504 cigarettes Nutrition 0.000 claims description 21
- 239000004071 soot Substances 0.000 claims description 21
- 238000010926 purge Methods 0.000 claims description 3
- 239000002956 ash Substances 0.000 description 22
- 230000000694 effects Effects 0.000 description 8
- 239000002253 acid Substances 0.000 description 7
- 239000004744 fabric Substances 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- KUBDPQJOLOUJRM-UHFFFAOYSA-N 2-(chloromethyl)oxirane;4-[2-(4-hydroxyphenyl)propan-2-yl]phenol Chemical compound ClCC1CO1.C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 KUBDPQJOLOUJRM-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Air Supply (AREA)
- Electrostatic Separation (AREA)
Abstract
The invention discloses an air distribution device and flue gas dust removal equipment provided with the same. The air distribution device comprises a casing (3), wherein the casing (3) is provided with an air inlet and an air outlet which are arranged oppositely; M heat exchange pipe layers are arranged in the casing (3); planes where the M heat exchange pipe layers are located are mutually parallel; each heat exchange pipe layer comprises a plurality of heat exchange pipes (16) which are arranged at intervals along the plane where the heat exchange pipe layer is located; the plane where each heat exchange pipe layer is located is perpendicular to the direction of the distance between the air inlet and the air outlet; two ends of each heat exchange pipe (16) are connected with the casing (3) respectively; and M is a positive integer larger than or equal to 2. According to the air distribution device provided by the invention, uniformity of the flue gas flow field is adjusted through the interval between the adjacent heat exchange pipes; and meanwhile, heat exchange media are introduced into the heat exchange pipes, the flue gas temperature is reduced through heat exchange between the flue gas and the heat exchange media in the heat exchange pipes, and the dust removal efficiency is improved.
Description
Technical field
The present invention relates to atmosphere pollution and administer field, particularly, relate to a kind of air-distribution device and there is the fume dust remover of this air-distribution device.
Background technology
Current coal-burning power plant more than 95% adopts electrostatic precipitator.As everyone knows, dry electrostatic cleaner is very limited for fine particle removal ability, and reason is, fine particle flue dust composition is mostly salic minerals, and its high specific resistance characteristic causes removal efficiency low, and " secondary droplets " that mechanical vibrator causes.And fly ash resistivity and flue-gas temperature closely related, its peak value appears between 121 DEG C ~ 232 DEG C according to coal ash characteristic, and time more than 232 DEG C, ratio resistance and the absolute temperature of flying dust are inversely proportional to; And during lower than 121 DEG C, fly ash resistivity and PTAT.In fact, when exhaust gas temperature is more than 140 DEG C, because of the rising of exhaust gas temperature and the increase of flue gas volume, boiler thermal output and efficiency of dust collection itself are had a negative impact; If exhaust gas temperature is lower than acid dew-point temperature (usually between 95 ~ 110 DEG C), because acid dew condensation particle coheres increase, easily causes deashing difficulty, efficiency of dust collection decline, and the corrosion of acid dew is caused to electric cleaner housing, blower fan and back-end ductwork.
Known based on above-mentioned analysis, how to the flue gas cool-down making deduster porch, make deduster inlet flue gas temperature between 95 ~ 110 DEG C, become one of effective means realizing existing electric cleaner synergy.
Existing deduster porch is provided with air-distribution device, the structure of this air-distribution device as shown in Figure 1, comprise shell 1001, this shell 1001 has air inlet 1002 positioned opposite and gas outlet 1003, three road distribution grids 1004 are provided with in shell 1001, each road distribution grid 1004 offers multiple through hole 1005 respectively, gas enters in this air-distribution device by air inlet 1002, then carry out flue gas flow field adjustment through the through hole 1005 on each road distribution grid 1004 successively, finally enter deduster entrance from gas outlet 1003.It can thus be appreciated that above-mentioned air-distribution device can only realize carrying out cloth wind to flue gas, to the flue gas cool-down of deduster porch, thus also just efficiency of dust collection cannot cannot be improved.
Therefore, how to make air-distribution device that flue gas can be made to be uniformly distributed, cooling can be carried out to flue gas again and become those skilled in the art's technical issues that need to address.
Summary of the invention
The object of this invention is to provide a kind of air-distribution device, this air-distribution device can play again the effect reducing flue-gas temperature carrying out equally distributed to flue gas while, thus improves efficiency of dust collection.
To achieve these goals, the invention provides a kind of air-distribution device, comprise housing, described housing has the air inlet and gas outlet that are oppositely arranged, wherein, M heat exchange tube layer is provided with in described housing, the plane at described M heat exchange tube layer place is parallel to each other, each described heat exchange tube layer comprises multiple heat exchanger tubes that the plane along this heat exchange tube layer place arranges spaced reciprocally, the plane at each described heat exchange tube layer place is vertical with the range direction between described air inlet and gas outlet, the two ends of heat exchanger tube described in each are connected with described housing respectively, M is the positive integer be more than or equal to.
Preferably, the multiple heat exchanger tubes in same described heat exchange tube layer are arranged in parallel to each other, the described heat exchanger tube setting interlaced with each other in adjacent two heat exchange tube layer.
Preferably, described M heat exchange tube layer forms N number of heat exchanger tube row, and each described heat exchanger tube row comprises the multiple described heat exchange tube layer be disposed adjacent, and be spaced between described N number of heat exchanger tube row, N is the positive integer being less than M.
Preferably, described housing is frustoconical, and described air inlet and gas outlet lay respectively at the two ends of described housing, and the diameter of described gas outlet is greater than the diameter of described air inlet.
Preferably, the distance between the central axis of two the adjacent heat exchanger tubes in heat exchange tube layer described in each is 3 ~ 3.5 times of described heat exchanger tube radius, and described in each, the equivalent percent opening of heat exchange tube layer is 30% ~ 36%.
Preferably, also comprise the one-level inlet header be positioned at outside described housing, primary outlet header, multiple secondary inlet header and multiple secondary exit port header, the described secondary inlet header that the two ends of each described heat exchanger tube row are corresponding with it is respectively communicated with described secondary exit port header, the inlet end of multiple described secondary inlet header is communicated with the outlet side of described one-level inlet header, and the outlet side of multiple described secondary exit port header is communicated with the inlet end of described primary outlet header;
One end of heat exchanger tube described in each is communicated with secondary inlet header, and the other end is communicated with secondary exit port header.
Preferably, described one-level inlet header and primary outlet header are arranged as parallel with the length direction of described heat exchanger tube, and described secondary inlet header and secondary exit port header are respectively perpendicular to described one-level inlet header and primary outlet header.
Preferably, the inlet end of described one-level inlet header connects booster fan, and the outlet side of described primary outlet header connects air preheater.
The present invention also provides a kind of smoke dust-removing equipment, comprises flue gas air-distribution device, and wherein, described flue gas air-distribution device is according to air-distribution device of the present invention.
Preferably, described smoke dust-removing equipment comprises electric cleaner, electric cleaner gas approach and electric cleaner exhaust pass, described electric cleaner gas approach is connected with the air inlet of described flue gas air-distribution device, the gas outlet of described flue gas air-distribution device is connected with the inlet end of described electric cleaner, and the outlet side of described electric cleaner is connected with described electric cleaner exhaust pass.
Preferably, this smoke dust-removing equipment comprises the one-level inlet header be positioned at outside described housing, primary outlet header, multiple secondary inlet header and multiple secondary exit port header, the described secondary inlet header that the two ends of each described heat exchanger tube row are corresponding with it is respectively communicated with described secondary exit port header, the inlet end of multiple described secondary inlet header is communicated with the outlet side of described one-level inlet header, and the outlet side of multiple described secondary exit port header is communicated with the inlet end of described primary outlet header; One end of heat exchanger tube described in each is communicated with secondary inlet header, and the other end is communicated with secondary exit port header; Described one-level inlet header is provided with flow control valve;
Described smoke dust-removing equipment also comprises cigarette temperature feedback attemperating unit, described cigarette temperature feedback attemperating unit comprises the electric cleaner inlet flue gas temperature measuring point be arranged on described electric cleaner gas approach, be arranged on the electric cleaner outlet cigarette temperature measuring point on described electric cleaner exhaust pass, be arranged on the inlet air temp measuring point on described one-level inlet header, be arranged on the air exit temp measuring point on described primary outlet header and controller, described controller respectively with described electric cleaner inlet flue gas temperature measuring point, electric cleaner outlet cigarette temperature measuring point, inlet air temp measuring point, air exit temp measuring point and flow control valve electrical connection, described controller is for accepting described electric cleaner inlet flue gas temperature measuring point, electric cleaner outlet cigarette temperature measuring point, inlet air temp measuring point, the temperature information that air exit temp measuring point sends also controls the aperture of described flow control valve according to described temperature information.
Preferably, described smoke dust-removing equipment comprises cleaner, described cleaner comprises the soot blower be communicated with described air-distribution device and the first ash bucket be connected to bottom described air-distribution device, and described soot blower is used for the dust be deposited in described air-distribution device to purge to described first ash bucket.
Preferably, described smoke dust-removing equipment comprises the Distributed Control System be electrically connected with described soot blower, and this Distributed Control System is used for interval at preset timed intervals and automatically starts described soot blower.
Preferably, the second ash bucket is provided with bottom described electric cleaner, described first ash bucket is all connected with Pneumatic conveyer with described second ash bucket, and described Pneumatic conveyer is used for the dust in described first ash bucket and described second ash bucket to be delivered to outside this smoke dust-removing equipment.
Air-distribution device provided by the invention, utilizes the uniformity of the gap adjustment flue gas flow field between heat exchanger tube; Meanwhile, in heat exchanger tube, pass into heat transferring medium, reduced the temperature of flue gas by the heat exchange of the heat transferring medium in flue gas and heat exchanger tube, reduce the volume of flue gas.When the gas outlet of this air-distribution device is connected with the arrival end of electric cleaner, because the volume of flue gas reduces, thus the flow velocity of this flue gas in electric cleaner reduces, and the time of staying of flue gas in the electric field of electric cleaner is extended, thus improves efficiency of dust collection.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the structural representation of air-distribution device of the prior art;
Fig. 2 is the right view of Fig. 1;
Fig. 3 is the structural representation of the smoke dust-removing equipment of embodiment of the present invention, illustrated therein is air-distribution device of the present invention;
Fig. 4 is that the A-A of Fig. 3 is to cut-away view.
Description of reference numerals
1 electric cleaner gas approach 2 air-distribution device
3 housing 4 high-tension electricity input systems
5 electric cleaner 6 electric cleaner outlet cigarette temperature measuring points
7 second ash bucket 8 Pneumatic conveyers
9 first ash bucket 10 electric cleaner exhaust pass
11 soot blower 12 electric cleaner inlet flue gas temperature measuring points
13 air exit temp measuring point 14 primary outlet headers
15 secondary exit port header 16 heat exchanger tubes
17 secondary inlet header 18 one-level inlet headers
19 flow control valve 20 inlet air temp measuring points
21 booster fans
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
In the present invention, when not doing contrary explanation, the noun of locality such as " upper and lower, left and right " of use typically refers to reference to upper and lower, left and right shown in the drawings." inside and outside " refers to the inside and outside of the profile of each parts own.
The invention provides a kind of air-distribution device, this air-distribution device can not only play uniform effect to flue gas and (namely adjust flue gas flow field, uneven flue gas is adjusted to the air-flow of flow velocity uniformity everywhere), and the temperature of flue gas can also be reduced, improve efficiency of dust collection.As shown in Figure 3 and Figure 4, this air-distribution device comprises housing 3, and described housing 3 has the air inlet and gas outlet that are oppositely arranged, and the left end of housing 3 is air inlet in figure 3, and right-hand member is gas outlet, and arrow represents the flow direction of flue gas (containing dust).M heat exchange tube layer is provided with in housing 3, the plane at described M heat exchange tube layer place is parallel to each other, each described heat exchange tube layer comprises multiple heat exchanger tubes 16 (as shown in Figure 4) that the plane along this heat exchange tube layer place arranges spaced reciprocally, the plane at each described heat exchange tube layer place is vertical with the range direction (left and right directions in Fig. 3) between described air inlet and gas outlet, the two ends of heat exchanger tube 16 described in each are connected with described housing 3 respectively, M be more than or equal to 2 positive integer, the value of M needs can be 2,3,4,5,6 according to cloth wind ...
Particularly, after flue gas enters this air-distribution device from air inlet, utilize the uniformity of the gap adjustment flue gas flow field between heat exchanger tube 16; Meanwhile, in heat exchanger tube 16, pass into heat transferring medium, reduced the temperature of flue gas by the heat exchange of the heat transferring medium in flue gas and heat exchanger tube 16, reduce the volume of flue gas.When the gas outlet of this air-distribution device is connected with the arrival end of electric cleaner, because the volume of flue gas reduces, thus the flow velocity of this flue gas in electric cleaner reduces, and the time of staying of flue gas in the electric field of electric cleaner is extended, thus improves efficiency of dust collection.
Wherein, heat exchanger tube 16 can be carbon steel light-wall pipe or stainless-steel thin-wall pipe, and the heat transferring medium in heat exchanger tube 16 can be air or water etc.
Multiple heat exchanger tubes 16 in same heat exchange tube layer can be arranged to various ways in interval, as long as there is suitable interval that flue gas can be allowed to pass through, such as interlaced with each other or be set parallel to each other.Preferably, the multiple heat exchanger tubes 16 in same described heat exchange tube layer are arranged in parallel to each other, described heat exchanger tube 16 setting interlaced with each other in adjacent two heat exchange tube layer.For convenience of description, before being defined as in the left side of Fig. 3, after right side is defined as, flue gas flows from front to back herein.Being meant to of described heat exchanger tube 16 setting interlaced with each other herein in adjacent two heat exchange tube layer, the interval between the heat exchanger tube 16 in the corresponding rear heat exchange tube layer in dead astern of the heat exchanger tube 16 in previous heat exchange tube layer; Heat exchanger tube 16 in the corresponding rear heat exchange tube layer in dead astern at the interval between the heat exchanger tube 16 in previous heat exchange tube layer, setting interlaced with each other so constantly can change the flow direction of air, thus realizes even flow field distribution.
Wherein, described M heat exchange tube layer forms N number of heat exchanger tube row, and each described heat exchanger tube row comprises the multiple described heat exchange tube layer be disposed adjacent, and be spaced between described N number of heat exchanger tube row, N is the positive integer being less than M.In the embodiment shown in Fig. 3, M is 10, N is 3, have 10 heat exchange tube layer, 3 heat exchanger tube rows, be followed successively by the first heat exchanger tube row, the second heat exchanger tube row, the 3rd heat exchanger tube row from left to right, wherein, two heat exchange tube layer are drawn together in first heat exchanger tube package, and three heat exchange tube layer are drawn together in second heat exchanger tube package, and five heat exchange tube layer are drawn together in the 3rd heat exchanger tube package.Obvious interval is had between three heat exchanger tube rows.Flue gas is distributed in the whole plane (being positioned at the part of housing 3) at this first heat exchange tube layer place through first heat exchange tube layer of first heat exchanger tube row successively, then again through the uniform effect of second heat exchange tube layer of first heat exchanger tube row, by flue gas each heat exchange tube layer through each heat exchanger tube row, final movable uniform air-flow.This air-distribution device flue gas is carried out uniform while, also with the wall contacts of heat exchanger tube 16 to carry out heat exchange, realize the effect of the temperature reducing flue gas.
Heat exchanger tube row also can need to arrange in a row, two rows, three rows, four rows or more according to actual heat exchange and cloth wind.Heat exchange tube layer in each heat exchanger tube row also can need to be arranged to one, two, three, four or more according to actual heat exchange and cloth wind.
Housing 3 can be the shape that square tube, pipe etc. are applicable to.In the embodiment shown in Fig. 3, housing 3 is frustoconical, both ends open.Air inlet and gas outlet lay respectively at the two ends of described housing 3, and in figure 3, air inlet is positioned at the left end of housing 3, and gas outlet is positioned at the right-hand member of housing 3.The diameter of gas outlet is greater than the diameter of described air inlet, and that is, the area of section of air inlet is greater than the area of section of gas outlet.The size of the gas outlet of housing 3 and the air inlet of electric cleaner measure-alike.
Wherein, the distance between the central axis of two the adjacent heat exchanger tubes 16 in heat exchange tube layer described in each is preferably 3 ~ 3.5 times of described heat exchanger tube 16 radius, and described in each, the equivalent percent opening of heat exchange tube layer is 30% ~ 36%.Be not more than 50Pa from air inlet to the pressure loss of gas outlet, the air-distribution device in present embodiment can ensure flue gas flowing between each heat exchanger tube row swimmingly, can play again the uniform effect to flue gas.
Wherein, this air-distribution device can also comprise the one-level inlet header 18 be positioned at outside described housing 3, primary outlet header 14, multiple secondary inlet header 17 and multiple secondary exit port header 15, the described secondary inlet header 17 that the two ends of each described heat exchanger tube row are corresponding with it is respectively communicated with described secondary exit port header 15, the inlet end of multiple described secondary inlet header 17 is communicated with the outlet side of described one-level inlet header 18, and the outlet side of multiple described secondary exit port header 15 is communicated with the inlet end of described primary outlet header 14.One end of each heat exchanger tube 16 is communicated with secondary inlet header 17, and the other end is communicated with secondary exit port header 15.Secondary inlet header 17 is connected with housing 3 respectively with secondary exit port header 15, and preferably, secondary inlet header 17 and secondary exit port header 15 adopt square tube, so that weld with housing 3.Secondary inlet header 17 and secondary exit port header 15 can adopt stainless steel or carbon steel to make.In order to ensure the stability of overall air-distribution device, secondary inlet header 17 and secondary exit port header 15 are all welded and fixed by ribs with housing 3.
The quantity of secondary inlet header 17 equals the quantity of secondary exit port header 15, and usually, and the quantity that the quantity of secondary inlet header 17 equals heat exchanger tube row equals the quantity of secondary exit port header 15.In the present embodiment, the quantity of secondary inlet header 17, secondary exit port header 15 and heat exchanger tube row is three, and one-level inlet header 18 and primary outlet header 14 are respectively one.Wherein, one-level inlet header 18 is arranged in the downside of three secondary inlet headers 17, is communicated with all secondary inlet headers 17; Primary outlet header 14 is arranged in the upside of three secondary exit port headers 15, is communicated with all secondary exit port headers 15.Heat transferring medium flow velocity in secondary inlet header 17 and secondary exit port header 15 arrange with each heat exchanger tube in heat exchanger tube 16 in heat transferring medium flow velocity equal.
Preferably, one-level inlet header 18, primary outlet header 14, multiple secondary inlet header 17 and multiple secondary exit port header 15 are set to centrosymmetric structure.That is, secondary exit port header 15 that the other end is connected is arranged after the central rotation 180 ° that secondary inlet header 17 and one-level inlet header 18 that one end connects arrange around this heat exchanger tube arranged by heat exchanger tube with this heat exchanger tube and primary outlet header 14 overlaps.Each secondary exit port header 15 is identical structure and size with each secondary inlet header 17 respectively, and each one-level inlet header 18 and each primary outlet header 14 are also identical structure and size.The pipe resistance characteristic adopting present embodiment that each heat exchanger tube can be made to arrange is identical, and the air velocity in the heat exchanger tube 16 of each heat exchanger tube row is identical, and it is equally distributed for ensureing that air flows through flow field when each heat exchanger tube is arranged, to play the effect of enhanced heat exchange.
One-level inlet header 18, primary outlet header 14, multiple secondary inlet header 17 and multiple secondary exit port header 15 can be arranged to the centrosymmetric structure of various ways, preferably, described one-level inlet header 18 and primary outlet header 14 are arranged as parallel with the length direction of described heat exchanger tube 16, and described secondary inlet header 17 and secondary exit port header 15 are respectively perpendicular to described one-level inlet header 18 and primary outlet header 14.Present embodiment composition graphs 4 describes the meaning of this centrosymmetric structure in detail, as shown in Figure 4, the air of the inlet end of secondary inlet header 17 flows (shown in arrow direction) from bottom to top along the length direction of secondary inlet header 17, air in this secondary inlet header 17 arrives the outlet side of secondary exit port header 15 by different heat exchanger tubes 16, and the distance that the air reaching the outlet side of secondary exit port header 15 by different heat exchanger tubes 16 is passed by is identical.Such as, air passes through the distance L that heat exchanger tube 16 is bottom walked
underequal the length sum of the length of one-level inlet header 18, the length of heat exchanger tube 16, the length of secondary exit port header 15 and primary outlet header 14; And the distance L that air is walked by heat exchanger tube 16 topmost
onequal the length of one-level inlet header 18, secondary inlet header 17, the length of heat exchanger tube 16, the length sum with primary outlet header 14; Length due to secondary exit port header 15 equals the length of secondary inlet header 17, therefore L
underequal L
on.
Wherein, the inlet end of described one-level inlet header 18 connects booster fan 21, and outside air enters in one-level inlet header 18 after booster fan 21 supercharging, is lowered the temperature to flue gas by the flowing of air in air-distribution device.
In addition, the outlet side of described primary outlet header 14 connects air preheater.After caloic exchanges, the air of intensification enters in air preheater, can be used for participating in combustion reaction.Air after heat exchange heats up by present embodiment passes into air preheater, realizes flue gas cool-down UTILIZATION OF VESIDUAL HEAT IN, reduces the energy consumed due to preheated air, save cost.Preferably, the outer wall of one-level inlet header 18, primary outlet header 14, secondary inlet header 17 and secondary exit port header 15 is all laid with heat-insulation layer, to prevent radiation loss.
The present invention also provides a kind of smoke dust-removing equipment, and this smoke dust-removing equipment can be used for coal-burning power plant's dedusting, and this smoke dust-removing equipment comprises flue gas air-distribution device, and wherein, described flue gas air-distribution device 2 is according to air-distribution device 2 of the present invention.
Wherein, described smoke dust-removing equipment comprises electric cleaner 5, electric cleaner gas approach 1 and electric cleaner exhaust pass 10, described electric cleaner gas approach 1 is connected with the air inlet of described flue gas air-distribution device 2, the gas outlet of described flue gas air-distribution device 2 is connected with the inlet end of described electric cleaner 5, and the outlet side of described electric cleaner 5 is connected with described electric cleaner exhaust pass 10.This electric cleaner 5 can be electrostatic precipitator.
This air-distribution device 2 and electric cleaner 5 with the use of, flow field adjustment can not only be carried out to the flue gas passed in electric cleaner 5, the temperature of flue gas can also be reduced simultaneously, thus reduce flue gas volume, delay the time of staying of flue gas in smoke dust-removing equipment main body, thus improve efficiency of dust collection.In addition, after flue gas cool-down, the ratio resistance of the dust in flue gas reduces, and is beneficial to dust charged, strengthens the electrostatic field in electric cleaner 5, makes dust to obtain efficient removal.
Through overtesting, when the flow velocity of the air in heat transferring medium is 10 ~ 13m/s, the heat of flue gas is absorbed through heat exchanger tube 16 wall forced heat-exchanging, air in heat exchanger tube 16 can heat up 5 ~ 15 DEG C, the flue-gas temperature at the gas outlet place of housing 3 can reduce by 20 ~ 30 DEG C, the flue gas volume of electric cleaner import department reduces 5 ~ 10%, thus efficiency of dust collection can improve 0.2 ~ 0.3%.
Wherein, this smoke dust-removing equipment comprises and is positioned at described housing (3) one-level inlet header (18) outward, primary outlet header (14), multiple secondary inlet header (17) and multiple secondary exit port header (15), the described secondary inlet header (17) that the two ends of each described heat exchanger tube row are corresponding with it is respectively communicated with described secondary exit port header (15), the inlet end of multiple described secondary inlet header (17) is communicated with the outlet side of described one-level inlet header (18), the outlet side of multiple described secondary exit port header (15) is communicated with the inlet end of described primary outlet header (14), one end of heat exchanger tube described in each (16) is communicated with secondary inlet header 17, and the other end is communicated with secondary exit port header (15), described one-level inlet header 18 is provided with flow control valve 19, this flow control valve 19 is for regulating the flow of the heat transferring medium passed in heat exchanger tube 16.When flow control valve 19 leaves large, the flow passing into the heat transferring medium in heat exchanger tube 16 is large, and heat exchanger tube 16 is stronger with the heat exchange action of flue gas, and it is more that flue-gas temperature reduces; Otherwise flow control valve 19 leaves hour, and the flow passing into the heat transferring medium in heat exchanger tube 16 is little, heat exchanger tube 16 is on the weak side with the heat exchange action of flue gas, and what flue-gas temperature reduced lacks.
Described smoke dust-removing equipment also comprises cigarette temperature feedback attemperating unit, and this cigarette temperature feedback attemperating unit is used for the flow of the heat transferring medium in feedback regulation heat exchanger tube 16.Described cigarette temperature feedback attemperating unit comprises the electric cleaner inlet flue gas temperature measuring point 12 be arranged on described electric cleaner gas approach 1, be arranged on the electric cleaner outlet cigarette temperature measuring point 6 on described electric cleaner exhaust pass 10, be arranged on the inlet air temp measuring point 20 on described one-level inlet header 18, be arranged on the air exit temp measuring point 13 on described primary outlet header 14 and controller, described controller respectively with described electric cleaner inlet flue gas temperature measuring point 12, electric cleaner outlet cigarette temperature measuring point 6, inlet air temp measuring point 20, air exit temp measuring point 13 and flow control valve 19 are electrically connected, described controller is for accepting described electric cleaner inlet flue gas temperature measuring point 12, electric cleaner outlet cigarette temperature measuring point 6, inlet air temp measuring point 20, the temperature information that air exit temp measuring point 13 sends also controls the aperture of described flow control valve 19 according to described temperature information, to increase or to reduce the flow of heat transferring medium (as air), ensure that whole equipment runs under the operating mode of the best.
Wherein, electric cleaner inlet flue gas temperature measuring point 12, electric cleaner outlet cigarette temperature measuring point 6, inlet air temp measuring point 20 and air exit temp measuring point 13 can be all thermocouples.
Wherein, described smoke dust-removing equipment comprises cleaner, described cleaner comprises the soot blower 11 be communicated with described air-distribution device 2 and the first ash bucket 9 be connected to bottom described air-distribution device 2, and described soot blower 11 purges to described first ash bucket 9 for the dust that will be deposited in described air-distribution device 2.Present embodiment is by device soot blower 11, other dusts that can nearly be deposited in heat exchanger tube 16 and housing 3 blow off in the first ash bucket 9, prevent the problems such as blocking and dust stratification, especially for the flue gas containing high-sulfur high viscosity dust, the long-term reliability service continuously of the equipment that ensures.Wherein, the structure of soot blower 11 is prior art, and the present invention does not limit this.
Wherein, described smoke dust-removing equipment comprises the Distributed Control System (DCS system) be electrically connected with described soot blower 11, and this Distributed Control System is used for interval at preset timed intervals and automatically starts described soot blower 11.Start this soot blower 11 by interval, can ensure that in air-distribution device, flow of flue gas uses smooth and easy.
Wherein, the second ash bucket 7 is provided with bottom described electric cleaner 5, described first ash bucket 9 is all connected with Pneumatic conveyer 8 with described second ash bucket 7, and described Pneumatic conveyer 8 is for being delivered to the dust in described first ash bucket 9 and described second ash bucket 7 outside this smoke dust-removing equipment.
Below for the smoke dust-removing equipment shown in Fig. 3 and Fig. 4, the specific works process of smoke dust-removing equipment is described:
Flue gas is through the inlet flue duct 1 of electric cleaner, enter in air-distribution device 2, in order successively by first heat exchanger tube row, second heat exchanger tube row and the 3rd heat exchanger tube row, when flue gas flows through the gap between the heat exchanger tube 16 in each heat exchanger tube row, turbulent flow aggravation improves heat transfer effect on the one hand, pass through the conversion between the change of flow direction and sound pressure energy on the other hand, realize even flow field distribution.Outside air sends into one-level inlet header 18 by booster fan, enter in the heat exchanger tube 16 in each heat exchanger tube row after shunting by three secondary inlet headers 17, air in heat exchanger tube 16 is turbulence state, flue gas heat is through the transmission of heat by contact thin with heat exchanger tube 16, air themperature in heat exchanger tube 16 progressively raises in tube side, enters after secondary exit port header 15 converges, enters primary outlet header 14 successively, the hot-air heated up enters in air preheater, and the caloic completing air and flue gas exchanges.The soot dust granule thing that flue gas carries because repeatedly turning to and lowering the temperature between heat exchanger tube 16, part soot dust granule thing is deposited on the surface of heat exchanger tube 16, the soot blower 11 started by fixed intervals, the soot dust granule thing of sedimentation is blown off in the first ash bucket 9, discharge air-distribution device by pneumatic ash conveying plant 8, complete air deashing process.After flue gas enters deduster 5 by the gas outlet of air-distribution device 2, DC high-voltage power supply enters electric cleaner 5 through high-tension electricity input system 4, under the effect of electric field force, after soot dust granule thing is captured, fall into the second ash bucket 7, discharge electric cleaner 5 through pneumatic ash conveying plant 8, complete flue gas ash removal process.
When boiler load variation, when exhaust gas volumn occurs significantly to change, by the temperature signal that electric cleaner inlet flue gas temperature measuring point 12, electric cleaner outlet cigarette temperature measuring point 6, inlet air temp measuring point 20, air exit temp measuring point 13 feed back, adjustment flow control valve 19, the flue-gas temperature controlling electric cleaner 5 porch, all the time a little more than acid dew-point temperature, prevents from causing the cold end corrosion of follow-up equipment flue lower than acid dew-point temperature.
Particularly, when boiler load diminishes, when exhaust gas volumn reduces, the temperature that electric cleaner inlet flue gas temperature measuring point 12, electric cleaner outlet cigarette temperature measuring point 6, inlet air temp measuring point 20 and air exit temp measuring point 13 record is all on the low side, after this Time Controller receives temperature signal on the low side, control the aperture turning flow control valve 19 down, reduce the air capacity participating in caloic exchange, the flue-gas temperature of electric cleaner 5 porch is ensured a little more than acid dew-point temperature (usually between 95 ~ 110 DEG C).When boiler load becomes large, when exhaust gas volumn subtracts large, the temperature that electric cleaner inlet flue gas temperature measuring point 12, electric cleaner outlet cigarette temperature measuring point 6, inlet air temp measuring point 20 and air exit temp measuring point 13 record is all higher, after this Time Controller receives the signal of temperature drift, control the aperture tuning up flow control valve 19, increase the air capacity participating in caloic and exchange, make the flue-gas temperature of electric cleaner 5 porch be reduced to temperature a little more than acid dew point (usually between 95 ~ 110 DEG C).
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible combination.
In addition, also can be combined between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (14)
1. an air-distribution device, comprise housing (3), described housing (3) has the air inlet and gas outlet that are oppositely arranged, it is characterized in that, M heat exchange tube layer is provided with in described housing (3), the plane at described M heat exchange tube layer place is parallel to each other, each described heat exchange tube layer comprises multiple heat exchanger tubes (16) that the plane along this heat exchange tube layer place arranges spaced reciprocally, the plane at each described heat exchange tube layer place is vertical with the range direction between described air inlet and gas outlet, the two ends of heat exchanger tube described in each (16) are connected with described housing (3) respectively, M be more than or equal to 2 positive integer.
2. air-distribution device according to claim 1, is characterized in that, the multiple heat exchanger tubes (16) in same described heat exchange tube layer are arranged in parallel to each other, described heat exchanger tube (16) setting interlaced with each other in adjacent two heat exchange tube layer.
3. air-distribution device according to claim 1 and 2, it is characterized in that, described M heat exchange tube layer forms N number of heat exchanger tube row, and each described heat exchanger tube row comprises the multiple described heat exchange tube layer be disposed adjacent, be spaced between described N number of heat exchanger tube row, N is the positive integer being less than M.
4. air-distribution device according to claim 1, it is characterized in that, described housing (3) is frustoconical, and described air inlet and gas outlet lay respectively at the two ends of described housing (3), and the diameter of described gas outlet is greater than the diameter of described air inlet.
5. air-distribution device according to claim 1, it is characterized in that, distance between the central axis of two the adjacent heat exchanger tubes (16) in heat exchange tube layer described in each is 3 ~ 3.5 times of described heat exchanger tube (16) radius, and described in each, the equivalent percent opening of heat exchange tube layer is 30% ~ 36%.
6. air-distribution device according to claim 1, it is characterized in that, also comprise and be positioned at described housing (3) one-level inlet header (18) outward, primary outlet header (14), multiple secondary inlet header (17) and multiple secondary exit port header (15), the described secondary inlet header (17) that the two ends of each described heat exchanger tube row are corresponding with it is respectively communicated with described secondary exit port header (15), the inlet end of multiple described secondary inlet header (17) is communicated with the outlet side of described one-level inlet header (18), the outlet side of multiple described secondary exit port header (15) is communicated with the inlet end of described primary outlet header (14),
One end of heat exchanger tube described in each (16) is communicated with secondary inlet header 17, and the other end is communicated with secondary exit port header (15).
7. air-distribution device according to claim 6, it is characterized in that, described one-level inlet header (18) and primary outlet header (14) are arranged as parallel with the length direction of described heat exchanger tube (16), and described secondary inlet header (17) and secondary exit port header (15) are respectively perpendicular to described one-level inlet header (18) and primary outlet header (14).
8. the air-distribution device according to claim 6 or 7, it is characterized in that, the inlet end of described one-level inlet header (18) connects booster fan (21), and the outlet side of described primary outlet header (14) connects air preheater.
9. a smoke dust-removing equipment, comprises flue gas air-distribution device, it is characterized in that, described flue gas air-distribution device is the air-distribution device (2) according to any one of this claim 1-8.
10. smoke dust-removing equipment according to claim 9, it is characterized in that, described smoke dust-removing equipment comprises electric cleaner (5), electric cleaner gas approach (1) and electric cleaner exhaust pass (10), described electric cleaner gas approach (1) is connected with the air inlet of described flue gas air-distribution device (2), the gas outlet of described flue gas air-distribution device (2) is connected with the inlet end of described electric cleaner (5), and the outlet side of described electric cleaner (5) is connected with described electric cleaner exhaust pass (10).
11. smoke dust-removing equipments according to claim 10, it is characterized in that, this smoke dust-removing equipment comprises and is positioned at described housing (3) one-level inlet header (18) outward, primary outlet header (14), multiple secondary inlet header (17) and multiple secondary exit port header (15), the described secondary inlet header (17) that the two ends of each described heat exchanger tube row are corresponding with it is respectively communicated with described secondary exit port header (15), the inlet end of multiple described secondary inlet header (17) is communicated with the outlet side of described one-level inlet header (18), the outlet side of multiple described secondary exit port header (15) is communicated with the inlet end of described primary outlet header (14), one end of heat exchanger tube described in each (16) is communicated with secondary inlet header 17, and the other end is communicated with secondary exit port header (15), described one-level inlet header (18) is provided with flow control valve (19),
Described smoke dust-removing equipment also comprises cigarette temperature feedback attemperating unit, described cigarette temperature feedback attemperating unit comprises the electric cleaner inlet flue gas temperature measuring point (12) be arranged on described electric cleaner gas approach (1), be arranged on electric cleaner outlet cigarette temperature measuring point (6) on described electric cleaner exhaust pass (10), be arranged on the inlet air temp measuring point (20) on described one-level inlet header (18), be arranged on the air exit temp measuring point (13) on described primary outlet header (14) and controller, described controller respectively with described electric cleaner inlet flue gas temperature measuring point (12), electric cleaner outlet cigarette temperature measuring point (6), inlet air temp measuring point (20), air exit temp measuring point (13) and flow control valve (19) electrical connection, described controller is for accepting described electric cleaner inlet flue gas temperature measuring point (12), electric cleaner outlet cigarette temperature measuring point (6), inlet air temp measuring point (20), the temperature information that air exit temp measuring point (13) sends also controls the aperture of described flow control valve (19) according to described temperature information.
12. smoke dust-removing equipments according to claim 10 or 11, it is characterized in that, described smoke dust-removing equipment comprises cleaner, described cleaner comprises the soot blower (11) be communicated with described air-distribution device (2) and the first ash bucket (9) being connected to described air-distribution device (2) bottom, and described soot blower (11) purges to described first ash bucket (9) for the dust that will be deposited in described air-distribution device (2).
13. smoke dust-removing equipments according to claim 12, it is characterized in that, described smoke dust-removing equipment comprises the Distributed Control System be electrically connected with described soot blower (11), and this Distributed Control System is used for interval at preset timed intervals and automatically starts described soot blower (11).
14. smoke dust-removing equipments according to claim 12, it is characterized in that, described electric cleaner (5) bottom is provided with the second ash bucket (7), described first ash bucket (9) is all connected with Pneumatic conveyer (8) with described second ash bucket (7), and described Pneumatic conveyer (8) is for being delivered to the dust in described first ash bucket (9) and described second ash bucket (7) outside this smoke dust-removing equipment.
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| CN201410545056.5A CN104258993B (en) | 2014-10-15 | 2014-10-15 | Air-distribution device and the smoke dust-removing equipment with the air-distribution device |
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Cited By (3)
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| CN108097463A (en) * | 2018-01-18 | 2018-06-01 | 福建龙净环保股份有限公司 | A kind of energy-efficient electric precipitator |
| CN110038391A (en) * | 2019-05-06 | 2019-07-23 | 国家能源投资集团有限责任公司 | Powdered activated coke moving bed desulfurizer |
| CN110354993A (en) * | 2019-07-21 | 2019-10-22 | 天津大学 | A kind of residual-heat used type electric dust separator |
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| CN104258993B (en) | 2017-03-08 |
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