CN203469746U - Wet-process desulphurization system with multi-stage humidifying demisting device - Google Patents

Wet-process desulphurization system with multi-stage humidifying demisting device Download PDF

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CN203469746U
CN203469746U CN201320577329.5U CN201320577329U CN203469746U CN 203469746 U CN203469746 U CN 203469746U CN 201320577329 U CN201320577329 U CN 201320577329U CN 203469746 U CN203469746 U CN 203469746U
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demister
humidification
wet
nozzle
final stage
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CN201320577329.5U
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王利国
杨杰
程爱平
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Abstract

The utility model discloses a wet-process desulphurization system with a multi-stage humidifying demisting device, relates to a thermal power plant purifying device and specifically relates to a device used for lowering dust content of a wet-process desulphurization flue gas of a spraying type desulphurization absorbing tower. The wet-process desulphurization system comprises an absorbing tower (1), wherein a spraying layer (6) and a demister (7) are arranged in the tower; a humidifying spray nozzle (8) is arranged behind the demister (7); a tail-stage demister (9) is arranged in a flue path (3) behind the humidifying spray nozzle (8); a flushing spray nozzle (10) with a flushing tail-stage demister (9) is arranged in front of the tail-stage demister (9). The wet-process desulphurization system disclosed by the utility model has the advantages as follows: firstly, smoke dust emission load of a thermal power plant chimney is effectively lowered; secondly, energy consumption is low, and energy consumption indexes are superior to those of electric-bag dust removal and wet-type electric dust removal; thirdly, investment is smaller which is only 30%-50% of that of the electric-bag dust removal and 15%-20% of that of the wet-type electric dust removal, device maintenance is convenient and service life is long; fourthly, construction period is short, and construction can be completed within 10 days-20 days; fifthly, operation and adjustment are simple, and device is safe and reliable.

Description

Be provided with the wet desulfurization system of multistage humidification demister
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." 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.
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 that is provided with multistage humidification demister.
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, in the 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.
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 of electricity bag, can reach new environmental emission standard; 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 30~50%, wet-esp 15~20%, plant maintenance facilitates, long service life; 4, short construction period, just can complete for 10~20 days; 5, operation is adjusted simply, and device security is reliable.
For 600MW (600,000 kilowatts) unit, electricity bag dedust innovation increases by 0.3~0.5 hundred million yuan of investment, 0.8~1.2 hundred million yuan of wet-esp transformation quotation.And application the technical program enforcement transformation can be saved 0.2~0.4 hundred million yuan with respect to the dedusting of electricity bag, with respect to wet-esp, can save 0.7~1.0 hundred million yuan.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 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, 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.
Final stage demister 9 belows are provided with water leg 11 and are connected with humidification water circulation precipitation water tank 12, the waters such as humidification nozzle 8, flooding nozzle 10 are from fresh water (FW) pipeline 14, humidification water circulation precipitation water tank 12 is provided with overflow pipe 15, manual blowdown pipe 16, continuous low discharge blow-off pipe 17, and be connected with humidification nozzle 8 by booster 18, also can be it 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 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.
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.
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 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, when design and installation high-pressure electrostatic humidification nozzle, consider to guarantee that overcurrent part can tolerate 5% watery hydrochloric acid and clean.
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), 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 humidification nozzle, 1~2 layer of 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 humidification nozzle to the original demister of process, in water spray humidification, flue-gas temperature slightly reduces, all the ratio of nozzle water spray total flow and exhaust gas volumn is called humidification liquid-gas ratio, and preferably humidification liquid-gas ratio is 0.01~0.05L/Nm 3after the new damping device of installing, in the flue of 4~10m, 1~2 layer of new demister~~new clothes final stage demister is installed, in the new final stage demister bottom of installing, water leg is installed, by water leg, collect new clothes final stage demister interception cohesion the humidification water of little droplet and flue dust, the purifying smoke droplet content by final stage demister is not higher than 75mg/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 3.0~10 mg/Nm to airborne release flue gas 3, can guarantee the total dustiness of airborne release flue gas not higher than 15mg/m 3.

Claims (7)

1. be provided with the wet desulfurization system of multistage humidification 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), 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).
2. the wet desulfurization system that is provided with multistage humidification 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 multistage humidification 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 multistage humidification demister as claimed in claim 1, 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 multistage humidification 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 multistage humidification 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 multistage humidification demister as claimed in claim 1, is characterized in that, described final stage demister (9) is 1~2 grade.
CN201320577329.5U 2013-09-18 2013-09-18 Wet-process desulphurization system with multi-stage humidifying demisting device Expired - Fee Related CN203469746U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103816771A (en) * 2014-03-26 2014-05-28 南京宇行环保科技有限公司 Absorption tower with wet type electric demister
CN106000013A (en) * 2016-08-02 2016-10-12 北京中航泰达环保科技股份有限公司 Wet desulfurization flue gas ultra-clean emission treatment system
CN107198952A (en) * 2017-06-23 2017-09-26 西安西热锅炉环保工程有限公司 The recycling system of mist eliminator flushing water in coal-burning power plant's wet desulfurization system
CN112237812A (en) * 2019-07-16 2021-01-19 昆岳互联环境技术(江苏)有限公司 Device and method for improving liquid drop generation of emptying pipe of acid-alkali liquor tank

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103816771A (en) * 2014-03-26 2014-05-28 南京宇行环保科技有限公司 Absorption tower with wet type electric demister
CN103816771B (en) * 2014-03-26 2016-01-06 南京宇行环保科技有限公司 A kind of absorption tower including wet type electrostatic precipitator
CN106000013A (en) * 2016-08-02 2016-10-12 北京中航泰达环保科技股份有限公司 Wet desulfurization flue gas ultra-clean emission treatment system
CN107198952A (en) * 2017-06-23 2017-09-26 西安西热锅炉环保工程有限公司 The recycling system of mist eliminator flushing water in coal-burning power plant's wet desulfurization system
CN112237812A (en) * 2019-07-16 2021-01-19 昆岳互联环境技术(江苏)有限公司 Device and method for improving liquid drop generation of emptying pipe of acid-alkali liquor tank

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