CN203494347U - Wet-desulphurization system with electrostatic humidification device and anode defogger - Google Patents
Wet-desulphurization system with electrostatic humidification device and anode defogger Download PDFInfo
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- CN203494347U CN203494347U CN201320577632.5U CN201320577632U CN203494347U CN 203494347 U CN203494347 U CN 203494347U CN 201320577632 U CN201320577632 U CN 201320577632U CN 203494347 U CN203494347 U CN 203494347U
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Abstract
The utility model discloses a wet-desulphurization system with an electrostatic humidification device and an anode defogger. The system comprises an absorption tower (1) in which spraying layers (6) and defoggers (7) are arranged, wherein humidification nozzles (8) are arranged behind the defoggers (7), and are connected with a high-voltage electrostatic power supply (19); a final defogger (9) is arranged in a flue (3) behind the humidification nozzles (8); flushing nozzles (10) for flushing the final defogger (9) are arranged in front of the final defogger (9); an electrostatic defogger (20) is arranged behind the final defogger (9), and is connected with the high-voltage electrostatic power supply (19). The system has the advantages that 1, the smoke dust discharge of a chimney of a thermal power plant is effectively reduced; 2, the system is low in energy consumption; 3, the system is less in investment, convenient to maintain and long in service life; 4, the system is short in construction period; 5, the system is extremely low in equipment failure rate; 6, the system is easy to operate and regulate and safe; 7, fine particles, denitration escape ammonia, heavy metal, organic pollutants and the like can be effectively collected.
Description
Technical field
The utility model relates to thermal power plant purifier, is specifically related to the device for reducing spray type desulfurization absorption tower wet desulfurization flue gas dustiness.
Background technology
Desulfuration absorbing tower is to use physics and chemistry method, removes sulfur dioxide in flue gas (SO
2) device or structures.The main component of pulverized-coal fired boiler flue dust: silica, alundum (Al2O3), di-iron trioxide, calcium oxide, magnesia, uncompleted burned carbon etc.The contained flue dust of thermal power plant desulfurization spray absorption tower flue gas after desulfurization, wherein contains the composition of part coal dust firing flue dust, and most of solid content is the slurry content in desulfuration absorbing tower.
Wet desulphurization is one of multiple sulfur method, and wet desulphurization is done absorbent carrier with water in absorption and course of reaction, and part water participates in the physical and chemical processes such as absorption and oxidation, and the reactions such as absorption and oxidation are most of to be completed in desulfuration absorbing tower.The mainstream technology of wet desulphurization is the desulfurization of lime stone～gypsum wet, has 80～95% for lime stone～gypsum wet desulfuration absorbing tower in wet desulphurization absorption tower.The ammonia process of desulfurization, sea water desulfuration, double alkali method desulfurizing, organic amine desulfurization etc. are all also wet desulphurizations.
In multiple desulfuration absorbing tower, having a class wet desulphurization absorption tower is spray absorption tower.Spray absorption tower main working process is to utilize slurry circulating pump to be transported to by absorbing slurries the spraying layer consisting of a plurality of nozzles, after absorbing the atomizer ejection of slurries by spraying layer, form intensive atomization slurry spray district, slurries contact with flue gas in atomizing spray district, in contact process, absorb the SO in flue gas
2deng pernicious gas, complete flue gas desulfurization, slurries descend slowly and lightly in the stock tank of bottom, absorption tower along inside, absorption tower.In spray-absorption process, the absorption slurries of atomization absorb the most of dust washing carrying in flue gas, and the flue dust major part that is washed absorption does not participate in the chemical reaction of absorbent.Flue dust absorptivity is subject to the many factors such as adsorption tower smoke flow velocity, sprinkle density, flue-gas temperature.Absorption tower flue gas after some tiny slurries drop and solid particulate matter times desulfurization in spray process carries, and contains sulfuric acid, sulfate, sulfur dioxide of dissolving etc. in fine droplet, contains the solid particles such as desulfurization sulfur agent, desulfurization product etc. simultaneously.Fine droplet does not form " mist " of 10～60 microns together with there is no the flue dust etc. of times washes clean, can cause heat exchanger, flue etc. to stain and heavy corrosion.
Demister is the drop of carrying secretly for separating of gas in tower, and to ensure mass-transfer efficiency, after reducing valuable loss of material and improving tower, how the operation of compressor, generally arrange demister at tower top.Demister is mainly used in gas-liquid separation.Also can be air cleaner separated for gas.Demister has spiral-flow type, folded plate type, the various ways such as waveform vane type, silk screen filter formula.2～3 grades of the most installations of demister of domestic built wet desulphurization absorption tower outlet.Wet desulphurization absorption tower outlet demister can effectively be removed " mist " of 10～60 microns, not high for the droplets of 2～10 microns and flue dust removal efficiency.
In the droplet of 2～10 microns, carry and be mingled with flue dust and desulfurization slurry composition, in droplet, be mingled with flue dust and desulfurization slurry to absorption tower content 20～35%, very large to the dustiness contribution degree of outlet, be the main source of absorption tower outlet dustiness.The droplet of 2～10 microns is discharged in atmosphere, can residual lower solid content after the evaporation of water in the good situation of weather condition in droplet, and part solid content particle diameter is below 2.5 μ m, and its main component is gypsum and solubilized salt.The droplet of 2～10 microns is discharged in atmosphere, and in the situation that air humidity is very large, droplet can condense moisture formation " chimney rain ".The droplet of 2～10 microns that gypsum content is higher is discharged in atmosphere, and in the situation that air humidity is very large, droplet can condense moisture formation " gypsum rain ".
State Standard of the People's Republic of China GB13223～2003 < < fossil-fuel power plant atmospheric pollutant emission standard > the > that combines issue according to Environmental Protection Department, State Administration for Quality Supervision and Inspection and Quarantine requires: the coal-fired unit of Thermal Power Generation Industry was carried out the special emission limit of flue dust from 1 day July in 2014, and both all thermal power plant's soot emissions limit value must not be higher than 30mg/m
3, key area thermal power plant soot emissions limit value must not be higher than 20mg/m
3.
Prior art can not all meet new national standard, " electricity bag dedusting " although, these technology of wet-esp can solve the higher problem of desulphurization system dust content, investment cost is high." dedusting of electricity bag " investment reaches 20～35 yuan/kwh, and after putting into operation, SR increases by 400～900pa, amounts to and increases station service 0.15%.Wet-esp reaches 60～100 yuan/kwh, and after putting into operation, SR increases by 300～600pa.And long construction period, the dedusting of electricity bag takes 40 days and just can complete above, and wet-esp takes 80 days and just can complete above, and operation and maintenance cost is also very high.
Summary of the invention
Technical problem to be solved in the utility model is: for the problems referred to above, provide a kind of wet desulfurization system with extremely low dustiness smoke eliminator.
Technical solution of the present utility model is: it comprises absorption tower, in tower, be provided with spraying layer and demister, after described demister, be provided with humidification nozzle, humidification nozzle is connected with high-voltage electrostatic power, in flue after humidification nozzle, be provided with final stage demister, before final stage demister, be provided with the flooding nozzle that rinses final stage demister, after final stage demister, be provided with electrostatic precipitator and be connected with high-voltage electrostatic power.
Technique effect of the present utility model is: its tool has the following advantages: 1, effectively reduce Chimney in Fossil Power Plant smoke discharge amount, discharge index is better than the dedusting, suitable with wet-esp effect of electricity bag, can reach and be easy to the environmental emission standard that reaches new, and keep effect stability.2, energy consumption is low, and energy consumption index is better than electricity bag dedusting and wet-esp.3, investment is less, be only the dedusting of electricity bag 40～60%, for 20～30% plant maintenances of wet-esp conveniently, long service life.4, short construction period, just can complete for 15～30 days, and the dedusting of electricity bag takes 40 days and just can complete above, and wet-esp takes 80 days and just can complete above.5, equipment failure rate is extremely low, and outstanding design assurance equipment can on-line maintenance after installing.6, operation is adjusted simply, device security.7, can effectively collect fine particle (PM2.5 dust, SO3 acid mist, aerosol), out of stock escape ammonia, heavy metal (Hg, As, Se, Pb, Cr), organic pollution (polycyclic aromatic hydrocarbon, dioxin) etc.Soot emissions can reach below 10mg/m, and dust collection performance and Dust Characteristics are irrelevant.8, after equipment operation, in the flue between high-pressure electrostatic humidification nozzle and cigarette anode demister, form an electric field smoothly, with the droplet of negative electrical charge along flue stream to " anode demister ", flow process was through 1～2 second time, can guarantee that the flue dust of 2～10 μ m and droplet are fully adsorbed and condense and with negative electrical charge, while arriving final stage demister and anode demister, almost can all be absorbed, reached unprecedented demist efficiency.9, along flue, arrange that static is except atomizing nozzle and anode demister, in flue, form the electric field that is bordering on sealing, be conducive to flow of flue gas.
Prior art can not all meet new national standard." dedusting of electricity bag " can reduce the smoke content of desulphurization system entrance, but can not solve absorption tower outlet gypsum dirt, carries and gypsum rain problem, can not fundamentally solve the higher problem of desulphurization system dust content, and invest higher." dedusting of electricity bag " investment reaches 50～80 yuan/kwh, and after putting into operation, SR increases by 400～900pa, amounts to and increases station service 0.15%, and operation and maintenance cost is also very high, and the rebuilding construction cycle is longer, 40 days and just can complete above.Although wet-esp can solve the higher problem of desulphurization system dust content, but investment cost is high, after putting into operation, SR increases by 300～400pa, amount to and increase station service 0.15%, during operation, high-voltage DC power supply power consumption is also very high, and " wet-esp " investment reaches 120～150 yuan/kwh.And long construction period, the dedusting of electricity bag takes 40 days and just can complete above, and wet-esp takes 80 days and just can complete above, and operation and maintenance cost is also very high.Built power plant does not arrange the space of implementing electric precipitation substantially.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
The specific embodiment
As shown in Figure 1, it comprises absorption tower 1, absorption tower 1 is provided with smoke inlet 2, flue 3, oxidation air entrance 5, spraying layer 6 and demister 7, smoke inlet 2 is provided with flue spray equipment 4, after the described demister 7 of distance, 0.3～1.0m is provided with humidification nozzle 8, humidification nozzle 8 is connected with high-voltage electrostatic power 19, after humidification nozzle 8, in the flue of 4～10m, be provided with final stage demister 9, before final stage demister 9, be provided with the flooding nozzle 10 that rinses final stage demister 9, after final stage demister 9, be provided with electrostatic precipitator 20 and be connected with high-voltage electrostatic power 19.
Described humidification nozzle 8 is 1～2 layer, humidification nozzle 8 interlamellar spacing 0.5～1.0m.The relative exhaust gas volumn liquid-gas ratio of described humidification nozzle 8 spray flow summation is 0.005～0.050L/Nm
3.Described humidification nozzle 8 water spray source pressure 0.2～0.6Mp.Humidification water solid content and dissolved impurity total content be not higher than 3%.Described humidification nozzle 8 is connected with pickling acid adding pipeline 13.Described final stage demister 9 belows are provided with water leg 11, and water leg 11 is connected with humidification water circulation precipitation water tank 12 by pipeline.Described humidification water circulation precipitation water tank 12 is connected with humidification nozzle 8 by booster 18.Described humidification water circulation booster 18 entrance pipes are provided with high-frequency electromagnetic scale inhibition instrument.Described final stage demister 9 is 1～2 grade, blade pitgh 15～28mm.Flue gas flow rate by final stage demister 9 is 3.5～5.5m/s., described humidification nozzle 8 is connected with high-voltage electrostatic power 19 negative electrodes, electrostatic precipitator 20 and high-voltage electrostatic power 19 anodic bondings.
Specifically be implemented as follows:
1, after the original last one deck demister of distance, 0.3～1.0m installs 1～2 layer of humidification nozzle, and the supporting structure of humidification nozzle is made by the good FRP of insulating properties or by steel outsourcing FRP.
If 2 install two-layer humidification nozzle, two-layer humidification nozzle is at a distance of 0.5～1.0m, and two-layer humidification nozzle interlaced arrangement guarantees that humidification is even.
3, new humidification nozzle water spray total flow of installing and the ratio of exhaust gas volumn are called liquid-gas ratio, and preferably liquid-gas ratio is for being 0.005～0.050L/Nm
3.
4, humidification nozzle water spray source pressure 0.2～0.6Mp, if water spray source pressure deficiency can pipe laying booster as the humidification water booster that circulates, every layer of corresponding 1 humidification water circulation booster of humidification nozzle, meets the requirement of water spray pressure, referring to humidification water circulation booster in figure.
5, require humidification water solid content and dissolved impurity total content not higher than 3%.
6, at humidification water import overall process water pipe design and installation filter screen, filter screen does not allow by being greater than 150 μ m impurity.
7,, at the online flowmeter of humidification water circulation booster outlet header's design and installation, monitor humidification water flow constantly.
8,, at humidification water intake header design and installation pickling acid adding pipeline, pickling acid adding pipeline is connected with sour measuring pump outlet.
9, according to water quality situation, be chosen in design and installation high-frequency electromagnetic scale inhibition instrument on humidification water circulation booster entrance pipe.
10, after the new installation of distance humidification water nozzle, in the flue of 4～10m, 1～2 grade of final stage demister is installed, final stage demister blade pitgh 15～28mm, blade shape, material, width, layout angle are determined according to actual condition, if can not guarantee that flue gas flow rate by final stage demister is at 3.5～5.5m/s, by the dilatation of part flue duct retrofit, guarantee the flue gas flow rate (flue that final stage demister is installed in schematic diagram has passed through dilatation) in claimed range of final stage demister.
11, before the new final stage demister of installing, 0.3～1.0m installs final stage mist eliminator flushing nozzle, regularly starts final stage mist eliminator flushing nozzle, rinses final stage demister.
12,0.5m and enter humidification water pipeline after flue and adopt and can tolerate 70 ℃ of high temperature and there is good insulation and acid resistance pipeline before entering flue, for example PPR pipeline and FRP pipeline.
13, according to ruuning situation, select installation and debugging high-voltage electrostatic power, by high-voltage electrostatic power plus earth, high-voltage electrostatic power negative electrode is connected with humidification nozzle, form high-pressure electrostatic humidification nozzle.
14, guarantee that overcurrent part can tolerate 5% watery hydrochloric acid and clean during design and installation high-pressure electrostatic humidification nozzle.
15, guarantee that all " high-voltage lines " of flue internal high pressure static humidification nozzle can tolerate flue wet flue gas, guarantee that leakproof does not discharge.
16, at each water inlet pipe, one section of corrosion resistant stainless steel tube is installed, and is guaranteed that this section of stainless steel tube has reliable ground connection, earth resistance is not more than 0.8 Ω, prevents from leaking electricity staff is wounded.
17, strengthen after original last one deck demister, to new the anticorrosion of flue between final stage demister of installing, guarantee to tolerate 30kv electric spark and detecting, there is no leaky.
18, to doing reliable ground to flue between new installation final stage demister after original last one deck demister, guarantee that earth resistance is not more than 0.8 Ω.
19, be chosen near the installation high-voltage static of each water inlet pipe and enter flue high-tension porcelain insulator, guarantee high-pressure electrostatic line security access flue.
20, the demister that one deck is made with conductive material is installed after final stage demister, as electrostatic precipitator.
21, select as required installation and debugging high-voltage electrostatic power, by high-voltage electrostatic power negative electrode utmost point ground connection, the demister that the high-voltage electrostatic power anode utmost point is made with conductive material is connected, and forms by " anode demister ", and anode demister is with high pressure positive charge.
22, selecting electric current is installed is the static power supply that 0.5～2A, voltage are 5～80kv, is high-voltage electrostatic spraying system and " anode demister " power supply.
The related demister of the utility model refers in particular to the demister of wet desulphurization absorption tower outlet, and great majority are corrugated sheet chip or folded plate type plate.The demist efficiency of demister increases with the suitable increase of air velocity, and this is because flow velocity is high, and the inertia force acting on droplet is large, is conducive to the separation of gas-liquid.But the increase of flow velocity will cause SR to increase, also make energy consumption increase.And the increase of flow velocity has certain limit, the too high meeting of flow velocity causes secondary band water, thereby reduces demist efficiency.Conventionally by by the highest of demister section and again flue gas flow rate during unlikely secondary band water be defined as critical flow velocity, this speed is relevant with factors such as demister structure, system band water, load, airflow direction, demister arrangements.Demister design preferable flow rate is generally selected in 3.5～5.5m/s.
The utility model principle: higher through slurry drops content in the clean flue gas of desulphurization system, in flue gas, when " supersaturation " state, (saturated-steam temperature continues to reduce steam partial pressure, the state that has condensing water droplet), through in after 2 layers of demister, the drop of particle diameter more than 10 μ m deviate from more than 99%, and the droplet extrusion rate that is less than 10 μ m is very low, remaining droplet and flue dust particle diameter are many at 2～10 μ m, along with these droplets of flow of flue gas and flue dust can collide mutually, cohesion, progressively form the droplet that particle diameter is larger.In not intervention situation, these droplets can enter upstream device (major effect GGH) or enter atmosphere along with flue gas.
One of main device of system is electrostatic spray humidification nozzle, 1～2 layer of electrostatic spray humidification nozzle is arranged on after desulfuration absorbing tower after the original last one deck demister of flow of flue gas direction, flue gas water spray humidification by from electrostatic spray humidification nozzle to the original demister of process, in water spray humidification, flue-gas temperature slightly reduces, the water smoke drop of electrostatic spray nozzle ejection is all with identical electric charge, the humidification water mist droplet particle size that electrostatic spray nozzle gushes out is comparatively even, each droplet is with same sex electric charge, same sex electric charge repels mutually, so distribute quickly and evenly and be diffused in mobile flue gas with electrostatic charge humidification water droplet, each humidification water drop with electric charge polarizes the neighbouring uncharged drop of 1～10 μ m and soot dust granule attract, all the ratio of electrostatic spray humidification nozzle water spray total flow and amount of flue gas emission is called humidification liquid-gas ratio, preferably humidification liquid-gas ratio is 0.005～0.05L/Nm
3, after the new damping device of installing, in the flue of 4～10m, install 1～2 layer new for conducting electricity, demister～new clothes final stage demister that resistant material is made, in the new final stage demister bottom of installing, demister water leg is installed, by demister water leg, collect the interception of new clothes final stage demister cohesion the humidification water of little droplet and flue dust, first order new clothes demister is done reliable ground connection, guarantee that demister can adsorb most of droplet with negative electrical charge, second level final stage demister and high-voltage electrostatic power anodic bonding, form anode demister, the medium and small droplet content of purifying smoke by final stage demister is not higher than 50mg/Nm
3, the droplet that only has minority 2～10 μ m that can pass through from new clothes final stage demister, these droplets are mingled with flue dust and desulfurization slurry content 5～12%, dustiness contribution degree 3.0～6 mg/Nm to airborne release flue gas
3, can guarantee total dustiness of airborne release flue gas not higher than 10mg/m
3.
Claims (8)
1. be provided with the wet desulfurization system of static damping device and anode demister, comprise absorption tower (1), in tower, be provided with spraying layer (6) and demister (7), it is characterized in that, after described demister (7), be provided with humidification nozzle (8), humidification nozzle (8) is connected with high-voltage electrostatic power (19), in flue (3) after humidification nozzle (8), be provided with final stage demister (9), the front flooding nozzle (10) that rinses final stage demister (9) that is provided with of final stage demister (9), after final stage demister (9), being provided with electrostatic precipitator (20) is connected with high-voltage electrostatic power (19).
2. the wet desulfurization system that is provided with static damping device and anode demister as claimed in claim 1, is characterized in that, described humidification nozzle (8) is 1～2 layer.
3. the wet desulfurization system that is provided with static damping device and anode demister as claimed in claim 1, is characterized in that, described humidification nozzle (8) is connected with pickling acid adding pipeline (13).
4. the wet desulfurization system that is provided with static damping device and anode demister as claimed in claim 1, it is characterized in that, described final stage demister (9) below is provided with water leg (11), and water leg (11) is connected with humidification water circulation precipitation water tank (12) by pipeline.
5. the wet desulfurization system that is provided with static damping device and anode demister as claimed in claim 4, is characterized in that, described humidification water circulation precipitation water tank (12) is connected with humidification nozzle (8) by booster (18).
6. the wet desulfurization system that is provided with static damping device and anode demister as claimed in claim 5, is characterized in that, described humidification water circulation booster (18) entrance pipe is provided with high-frequency electromagnetic scale inhibition instrument.
7. the wet desulfurization system that is provided with static damping device and anode demister as claimed in claim 1, is characterized in that, described final stage demister (9) is 1～2 grade.
8. the wet desulfurization system that is provided with static damping device and anode demister as claimed in claim 1, it is characterized in that, described humidification nozzle (8) is connected with high-voltage electrostatic power (19) negative electrode, electrostatic precipitator (20) and high-voltage electrostatic power (19) anodic bonding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320577632.5U CN203494347U (en) | 2013-09-18 | 2013-09-18 | Wet-desulphurization system with electrostatic humidification device and anode defogger |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320577632.5U CN203494347U (en) | 2013-09-18 | 2013-09-18 | Wet-desulphurization system with electrostatic humidification device and anode defogger |
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| CN201320577632.5U Expired - Fee Related CN203494347U (en) | 2013-09-18 | 2013-09-18 | Wet-desulphurization system with electrostatic humidification device and anode defogger |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103446837A (en) * | 2013-09-18 | 2013-12-18 | 王利国 | Wet desulfurization system with electrostatic humidifier and anode demister |
| CN104549738A (en) * | 2014-12-30 | 2015-04-29 | 浙江南源环境工程技术有限公司 | Wet dedusting and demisting device |
| CN115090090A (en) * | 2022-07-22 | 2022-09-23 | 中国华电科工集团有限公司 | Dust removal desulfurization absorption system and dust removal desulfurization absorption process |
-
2013
- 2013-09-18 CN CN201320577632.5U patent/CN203494347U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103446837A (en) * | 2013-09-18 | 2013-12-18 | 王利国 | Wet desulfurization system with electrostatic humidifier and anode demister |
| CN103446837B (en) * | 2013-09-18 | 2015-05-13 | 王利国 | Wet desulfurization system with electrostatic humidifier and anode demister |
| CN104549738A (en) * | 2014-12-30 | 2015-04-29 | 浙江南源环境工程技术有限公司 | Wet dedusting and demisting device |
| CN115090090A (en) * | 2022-07-22 | 2022-09-23 | 中国华电科工集团有限公司 | Dust removal desulfurization absorption system and dust removal desulfurization absorption process |
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