CN105289182A - Low-resistance air-cooled elliptical tube-type demister and demisting method - Google Patents

Low-resistance air-cooled elliptical tube-type demister and demisting method Download PDF

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CN105289182A
CN105289182A CN201510777622.XA CN201510777622A CN105289182A CN 105289182 A CN105289182 A CN 105289182A CN 201510777622 A CN201510777622 A CN 201510777622A CN 105289182 A CN105289182 A CN 105289182A
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air
cooled
tube
demister
ellipse
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CN105289182B (en
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刘定平
袁丹珏
王玲
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South China University of Technology SCUT
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South China University of Technology SCUT
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Abstract

The invention discloses a low-resistance air-cooled elliptical tube-type demister and a demisting method. The low-resistance air-cooled elliptical tube-type demister comprises an air-cooled elliptical tube-type demister system arranged on the top of a desulfurization tower and a cooling air automatic diversion system for introducing cold air into an elliptical tube bundle. The air-cooled elliptical tube-type demister system comprises a tube row array which comprises multiple layers of dot matrixes arranged staggerly and has the elliptical section. A grading directional washing water system comprises multiple nozzles spraying water upward and downward, and the multiple nozzles are arranged among the layered and arrayed elliptical tube bundles. The cooling air automatic diversion system comprises multiple wind direction fluid directors which are respectively arranged at windward ends and leeward ends of the tube row array along a perennial wind direction. The demister combines inertial separation and condensation separation, has the characteristics of high demisting and dedusting efficiency, small resistance, low energy consumption, scaling and obstruction difficulty and water saving and can effectively reduce gypsum rain produced by flue gas desulphurization.

Description

A kind of air-cooled ellipse tube type demister of low-resistance and defogging method thereof
Technical field
The present invention relates to the flue gas demist in wet flue gas desulfurizer, particularly relate to the air-cooled ellipse tube type demister of a kind of low-resistance and defogging method thereof.
Background technology
The a large amount of SO produced in the production process of the industries such as electric power, metallurgy, cement, petrochemical industry 2bring serious acid rain harm and haze weather, also result in and administer pressure greatly.At present, domestic extensive employing wet desulfurization of flue gas by limestone-gypsum method technology.But the flue gas after desulfurizing tower process has carried certain droplet secretly, not only containing moisture, sulfuric acid, sulfate, SO are also dissolved with 2and other subparticle.If do not manage removing, these droplet particles just can be deposited on the exhaust pass inner surface of desulfurizing tower, cause the Corrosion blockage of equipment; Or being discharged to chimney with flue gas, when entering air, near chimney, sedimentation produces " gypsum rain ".Therefore, auxiliary construction desulfurizer, improves desulfur technology, takes corresponding measure to administer " gypsum rain " significant to the sustainable development of coal-burning utilities.
At present, engineering adopt the demister of single type mostly and demister be arranged in desulfurization tower top or neat stress exhaust pass.Common baffle type mist eliminator is difficult to remove the small particle diameter droplet in flue gas and subparticle, and conventional tube demister removes Be very effective to the large droplet of particle diameter more than 400 μm, but still poor to the removing effect of little droplet.In addition, demister mainly directly rinses by the nozzle on fixing pipe network the slurry that demister adheres to termly by pipe network.There is certain flushing blind area in this washing form, easily causes the fouling and clogging of demister, even affects the operation of whole unit when blocking serious.Therefore, how to develop efficiently under slight drag, not susceptible to plugging demister is the important directions that current demister develops.
Summary of the invention
The object of the invention is to solve that traditional demister demist efficiency of dust collection is low, the resistance of flow of flue gas is comparatively large and rinse insufficient problem, provides the air-cooled ellipse tube type demister of a kind of low-resistance and defogging method thereof.
The present invention is achieved through the following technical solutions:
The air-cooled ellipse tube type demister of a kind of low-resistance, comprises the air-cooled elliptic tubes demister system being arranged on desulfurizing tower top, and for cold wind being introduced the cooling air auto-guiding system in air-cooled elliptic tubes demister system;
The a tube row that the ellipsoidal cross section tube bank 1 that described air-cooled elliptic tubes demister system is arranged by the stagger arrangement of multilayer dot matrix is formed, the two ends of oval tube bank 1 are supported on tube sheet 2 respectively.
The major axis B of described ellipse tube bank 1 cross section is 1.5 ~ 2.5 times of minor axis A; Flue gas stream enters from the bottom of a tube row, then is discharged by the top of a tube row.
Described cooling air auto-guiding system, comprises the multiple wind direction air deflectors 4 being separately positioned on a tube row windward side 11 and leeward end 12 and forms;
Each wind direction air deflector 4 comprises support bar 10, is arranged on support bar 10 with the deflector 9 of transmission device, the horizontal rotary bull stick 6 being arranged on support bar 10 end, the tapered rod head 5 being arranged on horizontal rotary bull stick 6 end, the empennage 8 being arranged on horizontal rotary bull stick 6 afterbody and the balance plate 7 be arranged on horizontal rotary bull stick 6;
Under the interaction of wind direction air deflector 4 between empennage 8 and cold wind air-flow, horizontal rotary bull stick 6 is made freely to turn to the direction consistent with cold wind wind direction.Cold wind air-flow, under the drainage of deflector 9, is flowed in oval tube bank 1 by the windward side 11 of a tube row, then flows out oval tube bank 1 by the leeward end 12 of a tube row.
Described empennage 8 is made up of symmetrical two pieces of trapezoidal plates, two pieces of trapezoidal plate combinations in " V " font.
Described air-cooled elliptic tubes demister system also comprises a directed flushing water system of classification for rinsing a tube row.
The directed flushing water system of described classification is made up of the nozzle 3 of layering, multiple injection waters up and down of arranged in arrays between each ellipse tube bank 1.
A kind of low-resistance air-cooled ellipse tube type defogging method is as follows:
Wind direction air deflector 4 utilizes the interaction between empennage 8 and cold wind air-flow, makes horizontal rotary bull stick 6 freely turn to the direction consistent with cold wind wind direction; Cold wind air-flow, under the drainage of deflector 9, flows in oval tube bank 1 by the windward side 11 of a tube row; Flue gas enters from the bottom of a tube row, restrains 1 surface stream at ellipse, the continuous deviation of its flow trace, makes partial particulate entrained in flue gas under the effect of inertia force, constantly clash into the outside wall surface of oval tube bank 1, is separated with flue gas; There is the temperature difference with the oval cold wind flowed in 1 of restraining in wet flue gas, make entrained saturated vapor produce condensation in the outside wall surface of ellipse tube bank 1, part subparticle, with steam, coalescence occurs, and is separated with flue gas.
The flue gas participated in after heat exchange is discharged from the top of a tube row, and cold wind then flows out oval tube bank 1 by the leeward end 12 of a tube row, is down the wind disposed in air.
The present invention, relative to prior art, has following advantage and effect:
(1) high-effective dust-removing demist: oval tube bank is staggered in arrangement for layering, dot matrix, produces certain effect to the flow-disturbing of flue gas.Eddy current is formed when flue gas flows in the tortuous passageway of oval pipe interfascicular alternating contractions and expansion, flue gas constantly deflects rising, fine particles constantly clashes into the outside wall surface of oval tube bank under the effect of inertia force, and effectively increase impact rate, demist efficiency of dust collection is higher.
(2) high-efficiency condensation heat exchange: introduce sub-cooled air in oval tube bank, increases oval tube bank and the specific area of smoke contacts, achieves the efficient coalescence of fine particle in saturated wet flue gas.
(3) flow of flue gas is even, resistance is little: oval pipe harness has the effect of uniform flue gas, and when making flue gas enter a tube row, Flow Field Distribution is more even, and the local secondary effectively reducing flue gas carries the phenomenon with local detachment effect difference.Oval tube bank can also reduce the resistance of windward side, reduces separation losses when flue gas walks around oval tube bank both sides and drag losses.
(4) energy consumption is saved: wind direction air deflector to the thrust of empennage by the flexible rotating of horizontal rotary bull stick and air-flow, can automatically adjust water conservancy diversion angle, introduce sub-cooled air efficiently.There is not extra energy input in (non-active) cooling air auto-guiding system, greatly saves operating cost.
(5) not easily block fouling: oval pipe harness has milder radian, possess good self-cleaning function.Air-cooled elliptic tubes demister system is provided with multistage comprehensive flooding nozzle, the flushing water of the upper strata pipe row in a tube row continues downwards to rinse lower floor pipe row, the multiply flushing water of oval pipe interfascicular constantly converges, and effectively solves conventional tubular demister and easily blocks, there is the problem of rinsing dead band.
(6) water-saving result is good: the steam entering air in traditional sulfur removal technology in a large number, by condensation, reclaims, reduces the water consumption of desulphurization system by this demister.
Accompanying drawing explanation
Fig. 1 is the present invention's air-cooled elliptic tubes demister system structure sectional view.
Fig. 2 is the cross sectional representation of the present invention's ellipse tube bank.
Fig. 3 is the present invention's multiple wind direction flow-guiding device structure schematic diagram.
Fig. 4 is the plan structure schematic diagram of the air-cooled ellipse tube type demister of low-resistance of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is more specifically described in detail.
Embodiment
As shown in Figures 1 to 4.The invention discloses the air-cooled ellipse tube type demister of a kind of low-resistance, comprise the air-cooled elliptic tubes demister system being arranged on desulfurizing tower top, and for cold wind being introduced (non-active) the cooling air auto-guiding system in air-cooled elliptic tubes demister system;
The a tube row that the ellipsoidal cross section tube bank 1 that described air-cooled elliptic tubes demister system is arranged by the stagger arrangement of multilayer dot matrix is formed, the two ends of oval tube bank 1 are supported on tube sheet 2 respectively.
The major axis B of described ellipse tube bank 1 cross section is 1.5 ~ 2.5 times of minor axis A; Flue gas stream enters from the bottom of a tube row, then is discharged by the top of a tube row.
Described cooling air auto-guiding system, comprises the multiple wind direction air deflectors 4 being separately positioned on a tube row windward side 11 and leeward end 12 and forms;
Each wind direction air deflector 4 comprises support bar 10, is arranged on support bar 10 with the deflector 9 of transmission device, the horizontal rotary bull stick 6 being arranged on support bar 10 end, the tapered rod head 5 being arranged on horizontal rotary bull stick 6 end, the empennage 8 being arranged on horizontal rotary bull stick 6 afterbody and the balance plate 7 be arranged on horizontal rotary bull stick 6;
Under the interaction of wind direction air deflector 4 between empennage 8 and cold wind air-flow, horizontal rotary bull stick 6 is made freely to turn to the direction consistent with cold wind wind direction.Cold wind air-flow, under the drainage of deflector 9, is flowed in oval tube bank 1 by the windward side 11 of a tube row, then flows out oval tube bank 1 by the leeward end 12 of a tube row.
Described empennage 8 is made up of symmetrical two pieces of trapezoidal plates, two pieces of trapezoidal plate combinations in " V " font.
Described air-cooled elliptic tubes demister system also comprises a directed flushing water system of classification for rinsing a tube row.
The directed flushing water system of described classification is made up of the nozzle 3 of layering, multiple injection waters up and down of arranged in arrays between each ellipse tube bank 1.
Inertial separation, phase transformation separation principle combine by the present invention, introduce the cooling-air of low temperature, to realize efficient demist in ellipse tube bank 1.When flue gas with certain flow rate through a tube row, due to ellipse tube bank 1 parallel being staggered in arrangement constitute narrow, tortuous exhaust gases passes, the flow velocity of flue gas and the flow direction are changed, the continuous deviation of flow trace and racing.Droplet and subparticle due to density large, poor to the followability of flue gas, under the effect of inertia force, clash into the outside wall surface of oval tube bank 1 and be separated with flue gas; The flue gas that temperature is higher also exists certain temperature difference with the oval 1 inner cooling-air constantly flowed of restraining, and flue gas carries out condensation heat transfer in the outside wall surface of ellipse tube bank 1, and carrying capacity reduces.Fractional saturation steam release latent heat, continuous condensation is gathered into saturated drop, and to restrain the outside wall surface generation coalescence of 1 at ellipse with the subparticle that carries in flue gas, effectively achieves gas-liquid separation.
The present invention adopts the directed flushing water system of classification, shunting about the flushing water sprayed vertically downward impacts when restraining 1 top to ellipse also along the flushing downwards of smooth arc surface, continues downward flushing after the oval tube bank of the flushing water vertically upward sprayed flushing 1 curved surfaces under gravity.The flushing water of continuous convergence effectively can be removed and remain in dust and dirt in oval tube bank 1 and slurries, improves the cleannes on oval tube bank surface.
The present invention utilizes the principle of equalising torque, is provided with the wind direction air deflector 4 with wind vane.Empennage 8 is made up of two pieces of symmetrical trapezoidal plates in " V " font, due to the existence of angle, reduces horizontal rotary bull stick 6 because of self inertia and rotates the unstable air inducing phenomenon brought; When natural airflow is aweather to air deflector 4, empennage 8 produces rotating torques with the interphase interaction of air-flow, makes horizontal rotary bull stick 6 freely turn to the direction consistent with cold wind wind direction.Wind direction air deflector 4 has the adaptivity of height and without electric energy and other energy consumption, when wind speed is less or change of the wind is little, can follow wind direction fast all the time, effectively improve the Drug delivery rate of cooling-air.
The defogging method of the air-cooled ellipse tube type demister of low-resistance of the present invention, realizes by following steps:
Wind direction air deflector 4 utilizes the interaction between empennage 8 and cold wind air-flow, makes horizontal rotary bull stick 6 freely turn to the direction consistent with cold wind wind direction; Cold wind air-flow, under the drainage of deflector 9, flows in oval tube bank 1 by the windward side 11 of a tube row; Flue gas enters from the bottom of a tube row, restrains 1 surface stream at ellipse, the continuous deviation of its flow trace, makes partial particulate entrained in flue gas under the effect of inertia force, constantly clash into the outside wall surface of oval tube bank 1, is separated with flue gas; There is the temperature difference with the oval cold wind flowed in 1 of restraining in wet flue gas, make entrained saturated vapor produce condensation in the outside wall surface of ellipse tube bank 1, part subparticle, with steam, coalescence occurs, and is separated with flue gas.
The flue gas participated in after heat exchange is discharged from the top of a tube row, and cold wind then flows out oval tube bank 1 by the leeward end 12 of a tube row, is down the wind disposed in air.
As mentioned above, just the present invention can be realized preferably.
Embodiments of the present invention are not restricted to the described embodiments; other are any do not deviate from Spirit Essence of the present invention and principle under do change, modification, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (7)

1. the air-cooled ellipse tube type demister of low-resistance, is characterized in that, comprises the air-cooled elliptic tubes demister system being arranged on desulfurizing tower top, and for cold wind being introduced the cooling air auto-guiding system in air-cooled elliptic tubes demister system;
The a tube row that ellipsoidal cross section tube bank (1) that described air-cooled elliptic tubes demister system is arranged by the stagger arrangement of multilayer dot matrix is formed, the two ends of oval tube bank (1) are supported on tube sheet (2) respectively.
2. the air-cooled ellipse tube type demister of low-resistance according to claim 2, is characterized in that, the major axis B of described ellipse tube bank (1) cross section is 1.5 ~ 2.5 times of minor axis A; Flue gas stream enters from the bottom of a tube row, then is discharged by the top of a tube row.
3. the air-cooled ellipse tube type demister of low-resistance according to claim 2, it is characterized in that, described cooling air auto-guiding system, comprises the multiple wind direction air deflectors (4) being separately positioned on a tube row windward side (11) and leeward end (12) and forms;
Each wind direction air deflector (4) comprises support bar (10), is arranged on support bar (10) with the deflector (9) of transmission device, the horizontal rotary bull stick (6) being arranged on support bar (10) end, the tapered rod head (5) being arranged on horizontal rotary bull stick (6) end, the empennage (8) being arranged on horizontal rotary bull stick (6) afterbody and the balance plate (7) be arranged on horizontal rotary bull stick (6);
Under the interaction of wind direction air deflector (4) between empennage (8) and cold wind air-flow, horizontal rotary bull stick (6) is made freely to turn to the direction consistent with cold wind wind direction; Cold wind air-flow is under the drainage of deflector (9), flowed in oval tube bank (1) by the windward side (11) of a tube row, then flow out oval tube bank (1) by the leeward end (12) of a tube row.
4. the air-cooled ellipse tube type demister of low-resistance according to claim 3, it is characterized in that, described empennage (8) is made up of symmetrical two pieces of trapezoidal plates, two pieces of trapezoidal plates combinations in " V " font.
5. the air-cooled ellipse tube type demister of low-resistance according to any one of Claims 1-4, is characterized in that, described air-cooled elliptic tubes demister system also comprises a directed flushing water system of classification for rinsing a tube row.
6. the air-cooled ellipse tube type demister of low-resistance according to claim 5, it is characterized in that, the directed flushing water system of described classification is made up of the nozzle (3) of layering, multiple injection waters up and down of arranged in arrays between each ellipse tube bank (1).
7. the air-cooled ellipse tube type defogging method of low-resistance, it is characterized in that adopting the air-cooled ellipse tube type demister of low-resistance according to any one of claim 1 to 6 to realize, concrete steps are as follows:
Wind direction air deflector (4) utilizes the interaction between empennage (8) and cold wind air-flow, makes horizontal rotary bull stick (6) freely turn to the direction consistent with cold wind wind direction; Cold wind air-flow, under the drainage of deflector (9), flows in oval tube bank (1) by the windward side (11) of a tube row; Flue gas enters from the bottom of a tube row, stream on ellipse tube bank (1) surface, the continuous deviation of its flow trace, makes partial particulate entrained in flue gas under the effect of inertia force, constantly clash into the outside wall surface of oval tube bank (1), is separated with flue gas; There is the temperature difference with the oval cold wind flowed in (1) of restraining in wet flue gas, make entrained saturated vapor produce condensation in the outside wall surface of ellipse tube bank (1), part subparticle, with steam, coalescence occurs, and is separated with flue gas;
The flue gas participated in after heat exchange is discharged from the top of a tube row, and cold wind then flows out oval tube bank (1) by the leeward end (12) of a tube row, is down the wind disposed in air.
CN201510777622.XA 2015-11-11 2015-11-11 A kind of air-cooled ellipse tube type demister of low-resistance and its defogging method Active CN105289182B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112870960A (en) * 2021-03-19 2021-06-01 中国华电科工集团有限公司 Ammonia spraying device and flue gas denitration device
CN112973426A (en) * 2021-03-19 2021-06-18 中国华电科工集团有限公司 Ammonia spraying device and flue gas denitration device

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EP0405303A1 (en) * 1989-06-23 1991-01-02 Sumitomo Light Metal Industries Limited Mist recovery apparatus with twisted strip inserted pipes
CN2467994Y (en) * 2001-02-21 2001-12-26 哈尔滨空调股份有限公司 Evaporating air cooler
CN201578952U (en) * 2009-12-24 2010-09-15 上海瑞亚安环保设备有限公司 Tubular demister and mist-removing device
CN103956963A (en) * 2014-05-05 2014-07-30 许润柱 Solar energy and wind energy generation combined device
CN104226073A (en) * 2013-06-13 2014-12-24 烟台龙源电力技术股份有限公司 Demisting dedusting device for flue gas treatment and flue gas demisting dedusting system
CN104815501A (en) * 2015-04-08 2015-08-05 华南理工大学 Multichannel-type composite demister and demisting method
CN205412552U (en) * 2015-11-11 2016-08-03 华南理工大学 Oval tubular defroster of low resistance forced air cooling

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0405303A1 (en) * 1989-06-23 1991-01-02 Sumitomo Light Metal Industries Limited Mist recovery apparatus with twisted strip inserted pipes
CN2467994Y (en) * 2001-02-21 2001-12-26 哈尔滨空调股份有限公司 Evaporating air cooler
CN201578952U (en) * 2009-12-24 2010-09-15 上海瑞亚安环保设备有限公司 Tubular demister and mist-removing device
CN104226073A (en) * 2013-06-13 2014-12-24 烟台龙源电力技术股份有限公司 Demisting dedusting device for flue gas treatment and flue gas demisting dedusting system
CN103956963A (en) * 2014-05-05 2014-07-30 许润柱 Solar energy and wind energy generation combined device
CN104815501A (en) * 2015-04-08 2015-08-05 华南理工大学 Multichannel-type composite demister and demisting method
CN205412552U (en) * 2015-11-11 2016-08-03 华南理工大学 Oval tubular defroster of low resistance forced air cooling

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112870960A (en) * 2021-03-19 2021-06-01 中国华电科工集团有限公司 Ammonia spraying device and flue gas denitration device
CN112973426A (en) * 2021-03-19 2021-06-18 中国华电科工集团有限公司 Ammonia spraying device and flue gas denitration device

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