CN104258683A - Wet-type electric precipitation system and process based on phase-change coagulation flow-equalizing technology - Google Patents
Wet-type electric precipitation system and process based on phase-change coagulation flow-equalizing technology Download PDFInfo
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- CN104258683A CN104258683A CN201410522652.1A CN201410522652A CN104258683A CN 104258683 A CN104258683 A CN 104258683A CN 201410522652 A CN201410522652 A CN 201410522652A CN 104258683 A CN104258683 A CN 104258683A
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Abstract
The invention discloses a wet-type electric precipitation system and a wet-type electric precipitation process based on a phase-change coagulation flow-equalizing technology. The wet-type electric precipitation system comprises a desulfurization absorption tower, a demister, an absorption tower outlet flue, a wet-type electric precipitator and a precipitator outlet flue, wherein the demister is arranged at the top of the desulfurization absorption tower; the absorption tower outlet flue is positioned above the desulfurization absorption tower, and the inlet of the absorption tower outlet flue is connected with the outlet of the demister; the absorption tower outlet flue is connected with the wet-type electric precipitator; the outlet of the wet-type electric precipitator is connected with the inlet of the precipitator outlet flue; the outlet of the precipitator outlet flue is connected with a chimney; a phase-change coagulation flow-equalizing chamber is mounted between the absorption tower outlet flue and the wet-type electric precipitator. The problem that a conventional wet-type electric precipitator difficultly charges particulate matters with over-small particle size is solved, the dust-removing efficiency of the wet-type electric precipitator is improved, and the gas emission of the system is less than 5 mg/m<3>.
Description
Technical field
The present invention relates to energy-conserving and environment-protective technical field, relate to a kind of Wet-type electric dust removal system and technique based on condensing flow equalize technology containing phase transformation.
Background technology
PM level fine particle is the main cause that atmospheric aerosol and haze weather are formed, PM level fine particle specific area is large, strong to noxious substance such as polycyclic aromatic hydrocarbons, atmospheric residence time is grown, is not easily spread, very large on the impact of health and atmosphere quality.At present, improvement is removed to PM level subparticle, cause each side to pay close attention to widely.
Burning pollutant discharge is the main source of below PM10 fine particle.Along with the promulgation of new " emission standard of air pollutants for boilers " (GB13271-2013), coal-burning boiler smoke dust discharge concentration is by original 100mg/m
3reduce to 50mg/m
3, key area reduces to 20mg/m
3.In the face of the dust exhausting concentration limit value that new requirement is higher, original cleaner of coal-burning boiler has been difficult to reach standard.
In current various novel dust removing technology, wet-esp is more effective a kind of measure.But; owing to being subject to the impact of some fine particle self properties; still can there is the situation that wet electrical dust precipitator does not power on to some aerosol particle or the too small particle lotus of particle diameter, cause cannot realizing dedusting on anode region, reduce its efficiency of dust collection.
Summary of the invention
For the defect existing for existing wet electrical dust precipitator or deficiency, the object of the invention is to, provide a kind of based on the Wet-type electric dust removal system containing phase transformation cohesion flow equalize technology.
The present invention is achieved by the following technical programs:
A kind of based on the Wet-type electric dust removal system containing phase transformation cohesion flow equalize technology, comprise desulfuration absorbing tower, demister, absorption tower exhaust pass, wet electrical dust precipitator and house outlet flue, described demister is arranged on desulfuration absorbing tower top, described absorption tower exhaust pass is positioned at above desulfuration absorbing tower and its entrance connects the outlet of demister, absorption tower exhaust pass connects described wet electrical dust precipitator, the outlet of wet electrical dust precipitator connects the entrance of house outlet flue, and the outlet of house outlet flue connects chimney; Phase transformation is installed between absorption tower exhaust pass and wet electrical dust precipitator and condenses current-sharing room; Pending flue gas successively after desulfuration absorbing tower, demister, absorption tower exhaust pass, phase transformation cohesion current-sharing room, wet electrical dust precipitator and house outlet flue, is discharged by chimney from bottom to top.
Further, water treating pond is provided with immediately below described phase transformation cohesion current-sharing room, the upper end open of described water treating pond is communicated with absorption tower exhaust pass, and the flusher that water treating pond and demister carry is connected, between water treating pond and this flusher, be provided with flushing pump.
Further, the U-tube bundle that described phase transformation cohesion current-sharing room is made up of many PFA capillary array, the entrance forming many PFA capillaries of this U-tube bundle is all connected to a cooling water inlet, and the outlet of many PFA capillaries is all connected to a coolant outlet.
Further, the many equal sweat solderings of PFA capillary of described composition U-tube bundle are on same PFA tube sheet.
Further, described U-tube bundle is rearranged according to stagger arrangement or along row mode by many PFA capillaries, and the tube center distance of adjacent PFA capillary is from being 20 ~ 30mm.
Further, the specification of described PFA capillary is
or
or other close specifications.
Further, the anode tube bank in described wet electrical dust precipitator is equilateral triangle arrangement, and the length of side of this equilateral triangle is 0.3 ~ 0.5m, is highly 2.0 ~ 6.5m.
Further, the material selection epoxy resin composite material of the anode tube bank in described wet electrical dust precipitator.
Another object of the present invention is, provides a kind of based on the wet-esp technique containing phase transformation cohesion current-sharing room, specifically comprises the steps:
Step 1, carries out desulfurization by pending flue gas through desulfuration absorbing tower;
Step 2, the droplet in the flue gas obtain step 1 and part flue dust are removed by demister;
Step 3, adopts the flue dust in wet electrical dust precipitator removal flue gas;
Before described step 3, also comprise the flue gas that step 2 is obtained pass into phase transformation cohesion current-sharing room carry out condensation and dispersion step.
Further, the step of the Water Sproading obtained after condensation by flue gas is also comprised.
The invention has the advantages that:
(1) device of the present invention is by increasing phase transformation cohesion current-sharing room at wet electrical dust precipitator entrance, by inlet flue gas condensation phase transformation, promote minuteness particle cohesion, and make smoke distribution even, effective solution wet electrical dust precipitator porch particle size is too small is difficult to charged problem, improve efficiency of dust collection, reach meticulous dedusting, ensure house outlet soot emissions <5mg/m
3.
(2) phase transformation cohesion current-sharing room to be alternately arranged the U-tube bundle formed one by one by many PFA capillaries of two kinds of specifications, and the tube center distance of adjacent PFA capillary is from being 20 ~ 30mm, while guarantee flue gas resistance ≯ 100Pa, this structural design makes flue gas flow equalizing disperse, and coordinate passing into of external refrigeration medium, accurately can control the phase variation of saturated flue gas, make flue gas cool-down 2 ~ 4 DEG C, sub-micron grade particle wherein effectively condenses, grows up, and after making flue dust enter wet scrubber, charge capacity improves greatly.
(3) phase transformation cohesion current-sharing room can solidifying water in recovered flue gas to water treating pond, flue gas condensed water, through process, sends back to top, absorption tower by flushing pump and uses as mist eliminator flushing water, energy-conserving and environment-protective.
(4) the present invention can efficient removal fine particle and aerosol, solves flue dust, gypsum rain, aerosol, SO comprehensively
3, mercury, the various contaminant problems such as PAHs.
Accompanying drawing explanation
Fig. 1 is the structural representation based on the Wet-type electric dust removal system containing phase transformation cohesion flow equalize technology of the present invention.
Fig. 2 is the structural representation of phase transformation cohesion current-sharing room.
Detailed description of the invention
Follow technical scheme of the present invention, The present invention gives embodiment, it should be noted that, the following stated is only specific embodiments of the invention, but technical characteristic of the present invention is not limited thereto, any those skilled in the art is in the field of the invention, and the change done or modification are all encompassed among the scope of the claims of the present invention.
Embodiment 1
As shown in Figure 1, the present embodiment based on containing phase transformation cohesion flow equalize technology Wet-type electric dust removal system, comprise desulfuration absorbing tower 1, demister 2, absorption tower exhaust pass 3, wet electrical dust precipitator 5 and house outlet flue 6, described demister 2 is arranged on desulfuration absorbing tower 1 top, described absorption tower exhaust pass 3 is positioned at above desulfuration absorbing tower 1 and its entrance connects the outlet of demister 2, absorption tower exhaust pass 3 connects described wet electrical dust precipitator 5, the outlet of wet electrical dust precipitator 5 connects the entrance of house outlet flue 6, the outlet of house outlet flue 6 connects chimney.In above-mentioned parts, desulfuration absorbing tower 1 carries out desulfurization for treating smoke treatment; Demister 2 is for removing the droplet in the flue gas after desulfurization and part flue dust; Wet electrical dust precipitator 5 is for removing the residue flue dust in flue gas.
In order to overcome existing wet electrical dust precipitator, some aerosol particle or the too small particle lotus of particle diameter not being powered on the situation that cannot realize dedusting on anode region caused, phase transformation being installed between absorption tower exhaust pass 3 and wet electrical dust precipitator 5 and condensing current-sharing room 4; The U-tube bundle that phase transformation cohesion current-sharing room 4 is made up of many PFA capillary array, the entrance forming many PFA pipes of this U-tube bundle is all connected to a cooling water inlet 9, and the outlet of many PFA capillaries is all connected to a coolant outlet 10.The said structure of phase transformation cohesion current-sharing room 4 can realize the flue gas condensing phase transformation of wet electrical dust precipitator porch, promotes that minuteness particle cohesion becomes large, and makes smoke distribution even; Effectively can to solve in conventional wet electric cleaner that particle size is too small is difficult to charged problem, improve the efficiency of dust collection of wet electrical dust precipitator.
Preferably, the many equal sweat solderings of PFA capillary forming U-tube bundle are on same PFA tube sheet thus become as a whole.
Preferably, U-tube bundle is by many PFA capillaries 11 according to stagger arrangement or rearrange, and the tube center distance of adjacent PFA capillary 11 is from being 20 ~ 30mm.The specification of PFA capillary 11 is
or
or other close specifications, such structure makes phase transformation cohesion current-sharing room 4 just have good flue gas flow equalizing dispersion effect, and resistance ≯ 100Pa.Certainly, also can select other with
or
the PFA capillary of close specification rearranges U-tube bundle according to stagger arrangement or along row.
The structural design of above-mentioned U-tube bundle makes flue gas flow equalizing disperse, simultaneously, coordinate passing into of external refrigeration medium, accurately can control the phase variation of saturated flue gas, make flue gas cool-down 2 ~ 4 DEG C, sub-micron grade particle wherein effectively condenses, grows up, after entering wet scrubber further, charge capacity improves, and then greatly improves the efficiency of dust collection of wet scrubber 5, ensures whole system outlet dust concentration ≯ 5mg/Nm
3.
Preferably, the anode tube bank in wet electrical dust precipitator 5 is equilateral triangle arrangement, and the length of side of this equilateral triangle is 0.3 ~ 0.5m, is highly 2.0 ~ 6.5m.Traditional anode tube bank is hexagonal array, and the effective flow area of flue gas is less, and the present invention's flue gas flow area under same flow area increases, flow velocity reduces, and extends the time of staying, is conducive to dedusting, dust collecting electrode surface moisture film is uniform and stable simultaneously, does not produce cutout and dry district;
The material selection epoxy resin composite material of the anode tube bank in wet electrical dust precipitator 5.
The inlet plenum of wet electrical dust precipitator 5 has gas approach and bottom dust-exhausting port; The water conservancy diversion gripper shoe of wet electrical dust precipitator 5 is for reducing smoke flow resistance; The flusher nozzle of wet electrical dust precipitator 5 and the distance of upper cathodic suspension bracket are 0.3 ~ 0.5m, and the distance between nozzle is more than 2 times of anode tube bank single tube.The upper lower chamber of wet electrical dust precipitator 5 is equipped with cathode frame, and fixes by insulated case; Corona wire is individually fixed on the cathode frame of upper and lower air chamber.Said structure good stability, corona wire not easily swings, and at electric field gas speed 1.5 ~ 4m/s, can realize the particle in ascending air behind phase transformation cohesion current-sharing room 4 effectively charged.
The operation principle of device of the present invention is as follows: pending flue gas successively after desulfuration absorbing tower 1, demister 2, absorption tower exhaust pass 3, phase transformation cohesion current-sharing room 4, wet electrical dust precipitator 5 and house outlet flue 6, is discharged by chimney from bottom to top.Specifically, pending flue gas is after desulfuration absorbing tower 1 desulfurization, part flue dust in demister 2 pairs of desulfuration absorbing tower 1 exiting flue gas and droplet remove, first flue gas enters phase transformation cohesion current-sharing room 4, namely pass through from bottom to top from U-tube is intrafascicular, condensation phase transformation occurs, the fine particle in flue gas condenses fast and becomes large, meanwhile, flue gas is evenly dispersed; Flue gas continues through wet electrical dust precipitator 5, and charged particle thing is attached to the anode tube bank surface in wet electrical dust precipitator 5; Flue gas after the purification that wet electrical dust precipitator 5 is discharged enters chimney from house outlet flue 6.
In above process, saturated wet flue gas falls into water treating pond 7 by the moisture condensed out behind phase transformation cohesion current-sharing room 4; Flushing water after wet electrical dust precipitator 5 periodic flushing also falls into water treating pond 7.The water collected in water treating pond 7 is delivered to desulfuration absorbing tower 1 top by flushing pump 8 and is used as the flushing water of demister 2, reaches the utilization again of recycle-water, economizes on resources.
Embodiment 2
As shown in Figure 2, this embodiment gives a kind of based on the wet-esp method containing phase transformation cohesion flow equalize technology, the method comprises the steps:
Step 1, carries out desulfurization by pending flue gas through desulfuration absorbing tower;
Step 2, the droplet in the flue gas obtain step 1 and part flue dust are removed by demister 2;
Step 3, the flue dust in flue gas removed by employing wet electrical dust precipitator 5;
Before described step 3, also comprise the flue gas that step 2 is obtained pass into phase transformation cohesion current-sharing room 4 carry out condensation and homodisperse step.
In addition, the step of the Water Sproading obtained after condensation by flue gas is also comprised.
Claims (10)
1. one kind based on containing phase transformation cohesion flow equalize technology Wet-type electric dust removal system, comprise desulfuration absorbing tower (1), demister (2), absorption tower exhaust pass (3), wet electrical dust precipitator (5) and house outlet flue (6), described demister (2) is arranged on desulfuration absorbing tower (1) top, described absorption tower exhaust pass (3) is positioned at the outlet of desulfuration absorbing tower (1) top and its entrance connection demister (2), absorption tower exhaust pass (3) connects described wet electrical dust precipitator (5), the outlet of wet electrical dust precipitator (5) connects the entrance of house outlet flue (6), the outlet of house outlet flue (6) connects chimney, it is characterized in that, phase transformation is installed between absorption tower exhaust pass (3) and wet electrical dust precipitator (5) and condenses current-sharing room (4), pending flue gas successively after desulfuration absorbing tower (1), demister (2), absorption tower exhaust pass (3), phase transformation cohesion current-sharing room (4), wet electrical dust precipitator (5) and house outlet flue (6), is discharged by chimney from bottom to top.
2. as claimed in claim 1 based on the Wet-type electric dust removal system containing phase transformation cohesion flow equalize technology, it is characterized in that, water treating pond (7) is provided with immediately below described phase transformation cohesion current-sharing room (4), the upper end open of described water treating pond (7) is communicated with absorption tower exhaust pass (3), and the flusher that water treating pond (7) and demister (2) carry is connected, and is provided with flushing pump (8) between water treating pond (7) and this flusher.
3. as claimed in claim 1 or 2 based on the Wet-type electric dust removal system containing phase transformation cohesion flow equalize technology, it is characterized in that, described phase transformation cohesion current-sharing room (4) is the U-tube bundle rearranged by many PFA capillaries (11), the entrance forming many PFA capillaries (11) of this U-tube bundle is all connected to a cooling water inlet (9), and the outlet of many PFA capillaries (11) is all connected to a coolant outlet (10).
4. as claimed in claim 3 based on the Wet-type electric dust removal system containing phase transformation cohesion flow equalize technology, it is characterized in that, the equal sweat soldering of many PFA capillaries (11) of described composition U-tube bundle is on same PFA tube sheet (12).
5. as claimed in claim 3 based on the Wet-type electric dust removal system containing phase transformation cohesion flow equalize technology, it is characterized in that, described U-tube bundle is rearranged according to stagger arrangement or along row mode by many PFA capillaries (11), and the tube center distance of adjacent PFA capillary (11) is from being 20 ~ 30mm.
6., as claimed in claim 3 based on the Wet-type electric dust removal system containing phase transformation cohesion flow equalize technology, it is characterized in that, the specification of described PFA capillary (11) is
or
or other close specifications.
7. as claimed in claim 1 based on the Wet-type electric dust removal system containing phase transformation cohesion flow equalize technology, it is characterized in that, anode tube bank in described wet electrical dust precipitator (5) is equilateral triangle arrangement, and the length of side of this equilateral triangle is 0.3 ~ 0.5m, is highly 2.0 ~ 6.5m.
8. as claim 1 or 6 state based on the Wet-type electric dust removal system containing phase transformation cohesion flow equalize technology, it is characterized in that, the material selection epoxy resin composite material of anode in described wet electrical dust precipitator (5) tube bank.
9., based on the wet-esp technique containing phase transformation cohesion current-sharing room, specifically comprise the steps:
Step 1, carries out desulfurization by pending flue gas through desulfuration absorbing tower (1);
Step 2, the droplet in the flue gas obtain step 1 and part flue dust are removed by demister (2);
Step 3, adopts the flue dust in wet electrical dust precipitator (5) removal flue gas;
It is characterized in that, before described step 3, also comprise the flue gas that step 2 is obtained pass into phase transformation cohesion current-sharing room (4) carry out condensation and dispersion step.
10., as claimed in claim 9 based on the wet-esp technique containing phase transformation cohesion current-sharing room, it is characterized in that, also comprise the step of the Water Sproading obtained after condensation by flue gas.
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| CN105689142A (en) * | 2016-02-05 | 2016-06-22 | 中国石油大学(北京) | Wet electric dust remover, anode thereof and system |
| CN105688582A (en) * | 2016-04-07 | 2016-06-22 | 国电环境保护研究院 | Condensation wet type electric compound flue gas purification process |
| CN105817112A (en) * | 2016-04-20 | 2016-08-03 | 东南大学 | Dedusting pretreatment device and method based on vapor phase change coupled electric coalescence |
| CN105817325A (en) * | 2016-05-06 | 2016-08-03 | 江苏釜鼎能源科技有限公司 | Wet type electric dust collector with pre-coagulation function |
| CN105854483A (en) * | 2016-05-05 | 2016-08-17 | 山东大学 | Dedusting flue for reinforcing fine particle surface steam adsorption and growing up processes, system and method |
| CN105903337A (en) * | 2016-06-21 | 2016-08-31 | 南通亚泰工程技术有限公司 | Flue gas desulfurization efficiency improvement, dust removal and dehydration integrated device |
| CN105944495A (en) * | 2016-07-15 | 2016-09-21 | 国电环境保护研究院 | Coal-fired flue gas deep purification smoke plume removing system |
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| CN106621680A (en) * | 2016-11-22 | 2017-05-10 | 凯天环保科技股份有限公司 | Method and system for deeply removing dust from flue gas after wet desulfurization |
| CN107029512A (en) * | 2017-05-11 | 2017-08-11 | 洛阳千百度窑炉科技有限公司 | The smoke and dust eliminating method and equipment of white cigarette gas |
| CN107321124A (en) * | 2017-05-08 | 2017-11-07 | 浙江大学 | The regulation and control of coal-burning power plant's energy-saving dedusting synergy cooperative intelligentization remove white system and method |
| CN108970382A (en) * | 2018-08-31 | 2018-12-11 | 大唐环境产业集团股份有限公司 | A kind of disturbing flow device for flue gas condensing |
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| CN105689142B (en) * | 2016-02-05 | 2017-11-10 | 中国石油大学(北京) | A kind of wet electrical dust precipitator and its anode and system |
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| CN105688582A (en) * | 2016-04-07 | 2016-06-22 | 国电环境保护研究院 | Condensation wet type electric compound flue gas purification process |
| CN105688582B (en) * | 2016-04-07 | 2020-06-30 | 国电环境保护研究院 | Condensation-wet-electricity composite flue gas purification process |
| CN105817112A (en) * | 2016-04-20 | 2016-08-03 | 东南大学 | Dedusting pretreatment device and method based on vapor phase change coupled electric coalescence |
| CN105817112B (en) * | 2016-04-20 | 2018-02-06 | 东南大学 | It is a kind of based on steam phase transformation coupling voltolisation and dedusting pretreatment unit and method |
| CN105854483A (en) * | 2016-05-05 | 2016-08-17 | 山东大学 | Dedusting flue for reinforcing fine particle surface steam adsorption and growing up processes, system and method |
| CN105817325A (en) * | 2016-05-06 | 2016-08-03 | 江苏釜鼎能源科技有限公司 | Wet type electric dust collector with pre-coagulation function |
| CN105903337A (en) * | 2016-06-21 | 2016-08-31 | 南通亚泰工程技术有限公司 | Flue gas desulfurization efficiency improvement, dust removal and dehydration integrated device |
| CN105944495A (en) * | 2016-07-15 | 2016-09-21 | 国电环境保护研究院 | Coal-fired flue gas deep purification smoke plume removing system |
| CN106110853A (en) * | 2016-08-29 | 2016-11-16 | 西安热工研究院有限公司 | The system and method for wet desulphurization device phase transformation reunion cooperation-removal fine particle |
| CN106621680A (en) * | 2016-11-22 | 2017-05-10 | 凯天环保科技股份有限公司 | Method and system for deeply removing dust from flue gas after wet desulfurization |
| CN107321124A (en) * | 2017-05-08 | 2017-11-07 | 浙江大学 | The regulation and control of coal-burning power plant's energy-saving dedusting synergy cooperative intelligentization remove white system and method |
| CN107321124B (en) * | 2017-05-08 | 2023-04-07 | 浙江大学 | Energy-saving, dust-removing, efficiency-enhancing, cooperative and intelligent regulation and control whitening system and method for coal-fired power plant |
| CN107029512A (en) * | 2017-05-11 | 2017-08-11 | 洛阳千百度窑炉科技有限公司 | The smoke and dust eliminating method and equipment of white cigarette gas |
| CN109331623A (en) * | 2018-06-05 | 2019-02-15 | 华北电力大学（保定） | A kind of smoke pollution of boiler object calcium method integration deep removal system based on preposition oxidation |
| CN108970382A (en) * | 2018-08-31 | 2018-12-11 | 大唐环境产业集团股份有限公司 | A kind of disturbing flow device for flue gas condensing |
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