CN103446839B - Wet desulphurization system with multi-stage humidification demisting device - Google Patents
Wet desulphurization system with multi-stage humidification demisting device Download PDFInfo
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- CN103446839B CN103446839B CN201310425819.8A CN201310425819A CN103446839B CN 103446839 B CN103446839 B CN 103446839B CN 201310425819 A CN201310425819 A CN 201310425819A CN 103446839 B CN103446839 B CN 103446839B
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Abstract
The invention discloses a wet desulphurization system with a multi-stage humidification demisting device, relates to a purification device of a thermal power plant, and particularly relates to a device for reducing wet desulphurization smoke dust load of a spray-type desulphurization absorption tower. The wet desulphurization system comprises the absorption tower, wherein the absorption tower is internally provided with a spraying layer and a demister; the wet desulphurization system is characterized in that a humidification nozzle is arranged on a position which is behind the demister and far form the demister by 0.3-1.0m, a flue which is behind the humidification nozzle and far from the humidification nozzle by 4-10m is internally provided with a last-stage demister, and a washing nozzle for washing the last-stage demister is in front of the last-stage demister. The wet desulphurization system provided by the invention has the following advantages that 1, the smoke discharge value of a chimney of the thermal power plant is effectively reduced; 2, the energy consumption is low, and the energy-consumption index is superior to that of electric bag dust extraction and wet dust extraction; 3, the investment is relatively small, the investment is 30-50% of the investment of the electric bag dust extraction and is 15-20% of the investment of the wet dust extraction, the maintenance of equipment is convenient, and the service life is long; 4, the construction period is short and can finish within 10-20 days; 5, the operation and the adjustment are easy, and the equipment is safe and reliable.
Description
Technical field
The present invention relates to thermal power plant purifier, be specifically related to the device for reducing spray type desulfurization absorption tower wet desulfurization flue gas dustiness.
Background technology
Desulfuration absorbing tower uses physics and chemistry method, removing 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.Flue dust contained by thermal power plant desulfurization spray absorption tower flue gas after desulfurization, the composition wherein containing part coal dust firing flue dust, most of solid content is the slurry content in desulfuration absorbing tower.
Wet desulphurization is one of multiple sulfur method, and wet desulphurization does 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 absorb and oxidation etc. is reacted major part and completed in desulfuration absorbing tower.The mainstream technology of wet desulphurization is lime stone ~ gypsum wet desulfurization, 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 also all wet desulphurizations.
In multiple desulfuration absorbing tower, a class wet desulphurization absorption tower is had to be spray absorption tower.Spray absorption tower main working process utilizes slurry circulating pump that absorption slurries are transported to the spraying layer be made up of multiple nozzle, absorb after slurries are sprayed by the atomizer of spraying layer and form intensive atomization slurry spray district, slurries, at atomizing spray district and smoke contacts, absorb the SO in flue gas in contact process
2deng pernicious gas, complete flue gas desulfurization, slurries are along in the inner stock tank descended slowly and lightly bottom absorption tower in absorption tower.In spray-absorption process, the most of dust washing carried in flue gas absorbs by the absorption slurries of atomization, is not participated in the chemical reaction of absorbent by the flue dust major part of washing absorption.Flue dust absorptivity is by many factors such as adsorption tower smoke flow velocity, sprinkle density, flue-gas temperatures.The flue gas of absorption tower in spray process after some tiny slurry droplet and solid particulate matter times desulfurization carries, containing the sulfuric acid, sulfate, sulfur dioxide etc. that dissolve in fine droplet, simultaneously containing solid particles etc. such as desulfurization sulfur agent, desulfurization products.Fine droplet with there is no " mist " that form 10 ~ 60 microns together with flue dust of times washes clean etc., heat exchanger, flue etc. can be caused to stain and heavy corrosion.
Demister is the drop carried 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 for gas separaion.Demister has spiral-flow type, folded plate type, the various ways such as waveform vane type, silk screen filter formula.The demister majority of domestic built wet desulphurization absorption tower outlet installs 2 ~ 3 grades.Wet desulphurization absorption tower outlet demister effectively can remove " mist " of 10 ~ 60 microns, for the droplets of 2 ~ 10 microns and flue dust removal efficiency not high.
Carry in the droplet of 2 ~ 10 microns and be mingled with flue dust and desulfurization slurry composition, be mingled with flue dust and desulfurization slurry in droplet 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 air, and can remain lower solid content after the water evaporation in the good situation of weather condition in droplet, part solid content particle diameter is below 2.5 μm, and its main component is gypsum and solubilized salt.The droplet of 2 ~ 10 microns is discharged in air, and when 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 air, and when air humidity is very large, droplet can condense moisture formation " gypsum rain ".
National Standard of the People's Republic of China GB13223 ~ 2003 " fossil-fuel power plant atmospheric pollutant emission standard " that environmentally protection portion, State Administration for Quality Supervision and Inspection and Quarantine combine issue require: Thermal Power Generation Industry coal unit performed the special emission limit of flue dust from 1 day July in 2014, and both whole thermal power plants soot emissions limit value must not higher than 30mg/m
3, key area thermal power plant soot emissions limit value must not higher than 20mg/m
3.
Prior art can not all meet new national standard." electric bag dedusting " can reduce the smoke content of desulphurization system entrance, but can not solve absorption tower outlet gypsum dirt carries and gypsum rain problem, fundamentally can not solve the higher problem of desulphurization system dust content, and invest higher." electric bag dedusting " investment reaches 50 ~ 80 yuan/kwh, and after putting into operation, SR increases by 400 ~ 900pa, and amount to and increase station service 0.15%, operation and maintenance cost is also very high, and the rebuilding construction cycle is longer, and just can complete for more than 40 days.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, electric bag dedusting takes and just can complete for more than 40 days, and wet-esp takes and just can complete for more than 80 days, and operation and maintenance cost is also very high.Built power plant does not arrange the space of implementing electric precipitation substantially.
Summary of the invention
Technical problem to be solved by this invention is: for the problems referred to above, provides a kind of wet desulfurization system being provided with multistage humidification demister.
Technical solution of the present invention is: it comprises absorption tower, spraying layer and demister is provided with in tower, it is characterized in that, 0.3 ~ 1.0m is provided with humidification nozzle after apart from described demister, after humidification nozzle 4 ~ 10m flue in be provided with final stage demister, be provided with the flooding nozzle rinsing final stage demister before final stage demister.
Technique effect of the present invention is: its tool has the following advantages: 1, effectively reduce Chimney in Fossil Power Plant smoke discharge amount, discharge index is better than electric bag dedusting, can reach new environmental emission standard; 2, energy consumption is low, and energy consumption index is better than electric bag dedusting and wet-esp; 3, investment is less, is only electric 30 ~ 50% of bag dedusting, 15 ~ 20% of wet-esp, and plant maintenance is convenient, long service life; 4, short construction period, just can complete for 10 ~ 20 days; 5, combustion adjustment is simple, and device security is reliable.
For 600MW (600,000 kilowatts) unit, electric bag dedust innovation increases investment 0.3 ~ 0.5 hundred million yuan, wet-esp transformation quotation 0.8 ~ 1.2 hundred million yuan.And apply the technical program implement transformation can save 0.2 ~ 0.4 hundred million yuan relative to electric bag dedusting, 0.7 ~ 1.0 hundred million yuan can be saved relative to wet-esp.After transformation, environmental protection can reach new environmental emission standard completely, has huge environmental benefit and economic benefit.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
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, humidification nozzle 8 is being provided with apart from 0.3 ~ 1.0m after described demister 7, be provided with final stage demister 9 in the flue of the rear 4 ~ 10m of humidification nozzle 8, before final stage demister 9, be provided with the flooding nozzle 10 rinsing final stage demister 9.
Be provided with water leg 11 below final stage demister 9 to be connected with humidification water circulation settling tank 12, humidification nozzle 8, flooding nozzle 10 etc. use water from fresh water (FW) pipeline 14, humidification water circulation settling tank 12 is provided with overflow pipe 15, manual blowdown pipe 16, continuously low discharge blow-off pipe 17, and be connected with humidification nozzle 8 by booster 18, also can be it and humidification water is provided.
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 is sprayed water source pressure 0.2 ~ 0.6Mp.Humidification water solid content and dissolved impurity total content be not higher than 3%.Humidification water is connected with pickling acid adding pipeline 13.Humidification water circulation booster 18 entrance pipe is provided with high-frequency electromagnetic scale inhibition instrument.Described final stage demister 9 is 1 ~ 2 grade, blade pitgh 15 ~ 28mm.Be 3.5 ~ 5.5m/s by the flue gas flow rate of final stage demister 9.
Specifically be implemented as follows:
1,0.3 ~ 1.0m installs 1 ~ 2 layer of humidification nozzle after apart from original last one deck demister.
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 ensures that humidification is even.
3, the humidification nozzle water spray total flow of new installation and the ratio of exhaust gas volumn are called liquid-gas ratio, and preferred liquid-gas ratio is 0.005 ~ 0.050L/Nm
3.
4, humidification nozzle water spray source pressure 0.2 ~ 0.6Mp, if water spray source pressure deficiency can to circulate booster as humidification water by pipe laying booster, every layer of corresponding 1 humidification water circulation booster of humidification nozzle, meets irrigation pressure requirement, see humidification water circulation booster in figure.
5, require that humidification water solid content and dissolved impurity total content be 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 μm of impurity.
7, at the online flowmeter of humidification water circulation booster outlet header's design and installation, moment monitoring humidification water flow.
8, at humidification water intake header design and installation pickling acid adding pipeline, pickling acid adding pipeline exports with sour measuring pump and is connected.
9, design and installation high-frequency electromagnetic scale inhibition instrument on humidification water circulation booster pump inlet pipeline is selected according to water quality situation.
10, distance is new humidification water nozzle is installed after 4 ~ 10m flue in 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 ensure by the flue gas flow rate of final stage demister at 3.5 ~ 5.5m/s, by the dilatation of part flue duct retrofit, ensure that the flue gas flow rate of final stage demister (installs the flue of final stage demister through dilatation) in claimed range in schematic diagram.
11, before the new final stage demister installed, 0.3 ~ 1.0m installs final stage mist eliminator flushing nozzle, regularly starts final stage mist eliminator flushing nozzle, rinses final stage demister.
12, before entering flue, 0.5m and the employing of the humidification water pipeline after entering flue can tolerate 70 DEG C of high temperature and have good insulation and acid resistance pipeline, such as PPR pipe road and FRP pipeline.
13, consider when design and installation high-pressure electrostatic humidification nozzle to ensure that overcurrent part can tolerate 5% watery hydrochloric acid cleaning.
Demister involved in the present invention 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 demisting efficiency of demister increases with the suitable increase of air velocity, and this is because flow velocity is high, and the inertia force acted on droplet is large, is conducive to the separation of gas-liquid.But the increase of flow velocity will cause SR to increase, and also make energy consumption increase.And the increase of flow velocity has certain limit, the too high meeting of flow velocity causes two sub-band water, thus reduces demisting efficiency.Usually flue gas flow rate during by the highest of demister section and again unlikely two sub-band water is 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 principle of the invention: slurry drops content is higher in the neat stress of desulphurization system, when in flue gas, steam partial pressure is in " supersaturation " state, (saturated-steam temperature continues to reduce, there is the state of condensing water droplet), after 2 layers of demister, the drop of particle diameter more than 10 μm is deviate from more than 99%, and the droplet extrusion rate being less than 10 μm is very low, remaining droplet and flue dust particle diameter many at 2 ~ 10 μm, along with these droplets of flow of flue gas and flue dust mutually can collide, condense, progressively form the larger droplet of particle diameter.In not intervention situation, these droplets can enter upstream device (major effect GGH) along with flue gas or enter air.
One of main device of system is humidification nozzle, 1 ~ 2 layer of humidification nozzle is arranged on after desulfuration absorbing tower along after the original last one deck demister in flow of flue gas direction, by humidification nozzle to the flue gas water spray humidification through original demister, while water spray humidification, flue-gas temperature slightly reduces, the ratio of whole nozzle spray total flow and exhaust gas volumn is called humidification liquid-gas ratio, and preferred humidification liquid-gas ratio is 0.005 ~ 0.05L/Nm
3after the new damping device installed 4 ~ 10m flue in 1 ~ 2 layer of new demister ~ ~ new clothes final stage demister is installed, in new final stage demister bottom of installing, water leg is installed, that collects the interception of new clothes final stages demister by water leg has condensed the humidification water of little droplet and flue dust, by the purifying smoke droplet content of final stage demister not higher than 75mg/Nm
3, the droplet only having minority 2 ~ 10 μm that can pass through from new clothes final stage demister, these droplets are mingled with flue dust and desulfurization slurry content 5 ~ 12%, to dustiness contribution degree 3.0 ~ 10 mg/Nm of airborne release flue gas
3, can ensure the total dustiness of airborne release flue gas not higher than 15mg/m
3.
Claims (6)
1. be provided with the wet desulfurization system of multistage humidification demister, comprise absorption tower (1), spraying layer (6) and demister (7) is provided with in tower, it is characterized in that, apart from described demister (7) afterwards 0.3 ~ 1.0m be provided with humidification nozzle (8), final stage demister (9) is provided with in the flue of humidification nozzle (8) 4 ~ 10m afterwards, final stage demister (9) is front is provided with the flooding nozzle (10) rinsing final stage demister (9)
Final stage demister (9) below is provided with water leg (11) and is connected with humidification water circulation settling tank (12), humidification nozzle (8), flooding nozzle (10) use water from fresh water (FW) pipeline (14), humidification water circulation settling tank (12) is provided with overflow pipe (15), manual blowdown pipe (16), continuously low discharge blow-off pipe (17), and be connected with humidification nozzle (8) by booster (18)
Described humidification nozzle (8) is 1 ~ 2 layer, humidification nozzle interlamellar spacing 0.5 ~ 1.0m,
Humidification water circulation booster (18) entrance pipe is provided with high-frequency electromagnetic scale inhibition instrument,
Described final stage demister (9) is 1 ~ 2 grade, blade pitgh 15 ~ 28mm.
2. be provided with the wet desulfurization system of multistage humidification demister as claimed in claim 1, it is characterized in that, described humidification nozzle (8) liquid-gas ratio is 0.005 ~ 0.050L/Nm
3.
3. as the wet desulfurization system being provided with multistage humidification demister that claim 1 is stated, it is characterized in that, described humidification nozzle (8) water spray source pressure 0.2 ~ 0.6Mp.
4. be provided with the wet desulfurization system of multistage humidification demister as claimed in claim 1, it is characterized in that, humidification water solid content and dissolved impurity total content be not higher than 3%.
5. be provided with the wet desulfurization system of multistage humidification demister as claimed in claim 1, it is characterized in that, humidification water is connected with pickling acid adding pipeline (13).
6. being provided with the wet desulfurization system of multistage humidification demister as claimed in claim 1, it is characterized in that, is 3.5 ~ 5.5m/s by the flue gas flow rate of final stage demister (9).
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| CN106731549A (en) * | 2016-12-30 | 2017-05-31 | 东南大学 | A kind of effective wet method fume desulfurizing system for eliminating gypsum rain |
| CN107051158A (en) * | 2017-04-27 | 2017-08-18 | 临沂圣大环保工程有限公司 | A kind of hydrogen peroxide desulfurizer handled for sulfuric acid tail gas and method |
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