CN105688558A - Falling film washing system realizing ultralow emission of coal-fired power plant desulfurated tail gas and technology thereof - Google Patents
Falling film washing system realizing ultralow emission of coal-fired power plant desulfurated tail gas and technology thereof Download PDFInfo
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- CN105688558A CN105688558A CN201610124945.3A CN201610124945A CN105688558A CN 105688558 A CN105688558 A CN 105688558A CN 201610124945 A CN201610124945 A CN 201610124945A CN 105688558 A CN105688558 A CN 105688558A
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- B01D47/12—Washers with plural different washing sections
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Abstract
The invention discloses a falling film washing system realizing ultralow emission of coal-fired power plant desulfurated tail gas and a technology thereof. The washing system comprises an absorbing section, an automatic circulation suction liquid bath, a special plate group demister matched with the absorbing section and a falling film washing section matched with the special plate group demister. The washing technology includes the steps that 1, flue gas enters the absorbing section and then makes contact with an absorbent; 2, most liquid drops with the large particle size and smoke dust in the flue gas are removed by the automatic circulation suction liquid bath to obtain new flue gas, then the flue gas is input into the absorbing section again; 3, the flue gas is conveyed to the special plate group demister through the absorbing section, and liquid drops with the diameter being 10 micrometers or above in the flue gas are removed by the special plate group demister; 4, impurities continue to be removed by the falling film washing section. Top space of an existing desulfuration tower and site space are fully used, separation efficiency and accuracy are improved, and the content of particulate matter in the wet desulfurization tail gas is reduced to the ultralow emission level.
Description
Technical field
The present invention relates to the solid separation field of vapour-liquid, be specifically related to one and realize Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film water wash system and technique thereof。
Background technology
Current desulfurizer is typically designed droplet content 75mg/m in demister exiting flue gas3This means that in neat stress, a part of deliquescent particulate matter is that wet desulphurization device increases, be unavoidable, simultaneously during actual motion, concentration of absorbing is too high or in absorption tower flue gas flow rate higher or demister effect is bad, all can cause and carry droplet content higher than 75mg/m3, now in flue gas, particle concentration is up to 20mg/m3Even higher, this concentration has reached the 20mg/m of key area in GB13223-2011 standard3Smoke dust discharge concentration limit value, the 30mg/m in general area in GB13223-2011 standard3Smoke dust discharge concentration limit value。Consider further that desulfurizer inlet flue gas dust content is 40～60mg/Nm3, so flue gas is difficult to meet new environmental protection standard requirement after wet desulphurization。
At present, at wet desulphurization tail gas except in mist dedusting application, wet cottrell, Flat defroster and ridge type demister three kinds are mainly adopted。
Wet cottrell: wet cottrell is mainly made up of anode system (receiving electrode), cathod system (corona wire), HVDC power supply, the high voltage electrostatic device corona wire to being erected in wet cottrell is utilized to apply high-tension electricity during work, high-voltage electrostatic field is defined between yin, yang two-stage, under the effect of electric field force, in whole receiving electrode pipe, all form corona zone。When the flue gas entrance of dust-laden, drop, aerosol, acid mist and other pollutant is enough to the electrostatic field making gas ionization, produce substantial amounts of negative ions and electronics and make dirt, acid mist, drop etc. charged, particle after charged moves to receiving electrode under the effect of electric field force and deposits on receiving electrode, in deposition process, receiving electrode inside pipe wall forms dust-laden liquid film, dust-laden liquid film flows in the collecting tank of wet cottrell bottom under gravity, thus reaching the purpose of dirt, drop, aerosol, acid mist and other pollutant in trapping flue gas。
Flat defroster: demister modules adopts the demister arrangements of horizontal structure form。Flat defroster can be installed in absorption tower, and flue gas, for flowing vertically to, is called the board-like demister of horizontal or is called for short Flat defroster；Flat defroster also can be installed vertically on absorption tower outlet horizontal flue, is called rectilinear board-like demister or chimney flue type demister。It is generally adopted Two-layer Beam to support or fixing。
Ridge type demister: demister modules adopts the demister arrangements of ridge structure form。It is divided into " people " font, rhombus and circle by profile。The mean flow rate that the advantage of ridge-roof type demister is flue gas is less than in tower horizontal cross-section by the flow velocity of blade normal, accordingly even when flue gas flow rate is higher in tower, when by demister, makes flue gas flow rate reduce owing to circulation area increases。
Flat and ridge type demister all adopts blade construction, and this structure demisting efficiency is low, and separation accuracy is low, and solid particle easily deposits on blade, easily there is dead angle in cleaning process, and mounting and dismounting inconvenience difficulty, investment is big。Wet cottrell application conditions is harsher simultaneously, and structure is more complicated, and electric quantity consumption is big, to existing equipment as transformed, it is impossible to meet wet cottrell space requirement。
Summary of the invention
For above-mentioned wet desulphurization tail gas except the problem existing for mist dedusting technology, offer one is provided and is capable of Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film water wash system；Simultaneously on the basis of this water wash system, also provide for one and realize Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film washing process。
For reaching above-mentioned purpose, technical scheme is as follows:
Scheme 1: providing one to realize Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film water wash system, described water wash system includes:
Absorber portion, is provided with the absorbent with smoke contacts in described absorber portion；
Automatic Cycle absorbs liquid pool, and described Automatic Cycle absorbs liquid pool and matches with absorber portion；
Specific panel group demister, described specific panel group demister matches with absorber portion；
Falling liquid film washing section, described falling liquid film washing section matches with specific panel group demister。
In a preferred embodiment of this water wash system, described Automatic Cycle absorbs liquid pool and includes aeration zone, aeration tube, dividing plate, overflow plate, inclined plate sedimentation district, deflector, zoneofoxidation, clear liquid area, mixed zone and demarcation strip。
In a preferred embodiment of this water wash system, described specific panel group demister includes the demister, one-level flushing water layer, one-level specific panel group demister, two grades of flushing water layers, three grades of flushing water layers and the two grades of specific panel group demisters that set gradually。
In a preferred embodiment of this water wash system, one-level is rinsed and is respectively equipped with flushing pipe on water layer, two grades of flushing water layers and three grades of flushing water layers。
In a preferred embodiment of this water wash system, described falling liquid film washing section includes wash water catcher, loose fiber bed, drip washing water pipe, drip washing tank, water inlet, wastewater discharge pipe, water washing cycles pipe, fresh water filling pipe, water washing cycles pump and water washing cycles groove。
In a preferred embodiment of this water wash system, described loose fiber bed includes the wet district of loose fiber, interior purchasing ore, the dry district of loose fiber, loose fiber dry district supporting layer, upper cover plate and drip washing water hole。
Scheme 2, it is provided that one realizes Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film washing process based on above-mentioned water wash system, and described technique comprises the steps:
(1) flue gas contacts with the absorbent in absorber portion after entering absorber portion, and after contact, flue gas can drop into Automatic Cycle together with absorbent and absorb in liquid pool；
(2) the major part bigger drop of particle diameter in flue gas and flue dust can be removed and obtain new flue gas by Automatic Cycle absorption liquid pool, is then re-entered on absorber portion by flue gas；
(3) flue gas is sent to specific panel group demister by absorber portion, and the drop of more than in flue gas 10 microns is removed by specific panel group demister, and the flue gas after removing is sent to falling liquid film washing section；
(4) flue gas is continued, except matter, to be removed by more than in flue gas 1 micron drop, it is ensured that in flue gas, droplet content is less than 30mg/m3, and dust content is less than 5mg/m3 by falling liquid film washing section。
In a preferred embodiment of this washing process, flue gas initially enters Automatic Cycle and absorbs the aeration zone in liquid pool, the air liquid level that aeration zone is blasted by aeration tube gets a promotion, zoneofoxidation is entered after overflow plate, the liquid that absorbs after oxidation enters inclined plate sedimentation district under the effect of deflector, experimental solids granule sharp separation, absorb liquid clear liquid overflow and enter clear liquid area, after serosity entrance absorption liquid mixed zone mixes with fresh slurry, aeration zone is entered to realize Automatic Cycle, thus the major part bigger drop of particle diameter in flue gas and flue dust being removed after deflector and baffle plate。
In a preferred embodiment of this washing process, after flue gas enters special pipe demister, first time rinses water layer and follows special pipe demister closely, rinse direction along flue gas ascent direction, first order specific panel group demister is rinsed, the second level is rinsed water layer and is followed the setting of first order specific panel group demister closely, rinse against flue gas ascent direction, the third level is rinsed water layer and follows second level flushing water layer setting closely, rinse along flue gas ascent direction, second level specific panel group demister follows third level flushing water stratification closely, thus the drop by more than in flue gas 10 microns is removed。
In a preferred embodiment of this washing process, flue gas after specific panel group demister preliminary purification can pass through washing water catcher and enter loose fiber Chuan Shi district, washing water is under the drainage of fiber, water membrane is formed at fiber surface, the fine droplet trapped accordingly and increase in flue gas and fine particulates, the drop of more than 1 micron in tail gas is removed with this
Ensure that in exiting flue gas, droplet content is less than 30mg/m3, dust content is less than 5mg/m3；Washing water is stored in water washing cycles tank simultaneously, washing water forms closed-loop path by drip washing water pipe, drip washing tank, loose fiber bed, washing water catcher, water inlet, water washing cycles pipe, water washing cycles pump and water washing cycles tank, waste water is discharged by wastewater discharge pipe, fresh water is filled into by fresh water filling pipe, and the waste water of generation enters wastewater treatment or desulphurization system uses。
Falling liquid film provided by the invention washing scheme makes full use of existing desulfurizing tower headroom and site space, improves separation efficiency and precision, the particle content in wet desulphurization tail gas is reduced to minimum discharge level, effectively solves the problem existing for prior art。
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings。
Fig. 1 is the system flow chart of the present invention；
Fig. 2 is the structural representation that Automatic Cycle absorbs liquid pool；
Fig. 3 is the view in transverse section of Fig. 2；
Fig. 4 is the longitdinal cross-section diagram of Fig. 2；
Fig. 5 is the structural representation of loose fiber bed。
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and effect and be easy to understand, below in conjunction with being specifically illustrating, the present invention is expanded on further。
Referring to Fig. 1, provided by the invention realizing Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film water wash system, it includes absorber portion 1, Automatic Cycle absorbs liquid pool 2, specific panel group demister and falling liquid film washing section。
Absorber portion 1, it is provided with the absorbent with smoke contacts in inside, and flue gas enters into after in absorber portion 1, can contact with absorbent, and drops into together with flue gas in Automatic Cycle absorption liquid pool 2。
Automatic Cycle absorbs liquid pool 2, and its absorber portion 1 matches, and it is for the major part bigger drop of particle diameter in flue gas and flue dust being removed。
Referring to Fig. 2 to Fig. 4, Automatic Cycle absorbs liquid pool 2 and includes aeration zone 01, aeration tube 02, dividing plate 03, overflow plate 04, inclined plate sedimentation district 05, deflector 06, zoneofoxidation 07, clear liquid area 08, mixed zone 09 and demarcation strip 010。
Former flue gas is after absorber portion 1, realize vapour-liquid with absorbent to contact, absorbent falls into cyclic absorption liquid pool 2, the air liquid level that circulating absorption solution is blasted by aeration tube 02 in aeration zone 01 gets a promotion, zoneofoxidation 07 is entered after overflow plate 04, the liquid that absorbs after oxidation enters inclined plate sedimentation district 05 under the effect of deflector 06, experimental solids granule sharp separation, absorb liquid clear liquid overflow and enter clear liquid area 08, after serosity entrance absorption liquid mixed zone 09 mixes with fresh slurry, aeration zone 01 is entered to realize self-loopa after deflector 06 and baffle plate 03, flue gas can carry after the material such as drop and dirt rises to special pipe demister 3, drop and particulate matter that wherein most particle diameter is bigger are captured。
Aeration tube is laid on bottom aeration zone, after absorbing liquid entrance aeration zone, because gas lift effect liquid level promotes, zoneofoxidation is entered after overflow plate, blast large quantity of air in zoneofoxidation and will absorb liquid oxidation, absorption liquid after simultaneous oxidation is under deflector effect, enter inclined plate sedimentation district, the solid particle formed after making oxidation and absorption liquid sharp separation, form the absorption liquid that lower floor's concentration is higher, the Concentraton gradient absorbing liquid that upper strata concentration is relatively low, high-concentration absorbent liquid is discharged from inclined plate sedimentation district, low-concentration absorption liquid enters clear liquid area and enters desulfurizing tower absorber portion, high-concentration absorbent liquid with fresh absorption liquid after mixed zone mixes, it is again introduced into circulation。
Circulating absorption solution realizes self-loopa by the oxidation air blasted, oxidation air promotes circulating absorption solution by aeration tube 02 and forms liquid level difference, making the Oxidation of absorption liquid in aeration zone 01 and zoneofoxidation evenly, in cyclic absorption liquid pool, concentration and pH value are more easy to stable simultaneously。
Referring to Fig. 1, specific panel group demister, it matches with absorber portion 1, and it is for being removed by the drop of more than in flue gas 10 microns。
Specific panel group demister includes special pipe demister 3, one-level rinses water layer 4, wash tub pipe 5, one-level specific panel group demister 6, two grades rinse water layer 7, three grades and rinse water layer 8 and two grades of specific panel group demisters 9。
Special pipe demister 3 is arranged immediately following desulfurizing tower absorber portion, and one-level specific panel group demister 6 rinses water layer 4 immediately following one-level and arranges, and two grades of specific panel group demisters 9 rinse water layer 8 immediately following three grades and arrange, and special pipe has self-cleaning function, and specific panel group adopts High efficiency baffle plate。Flue gas flow velocity in demister is 2～5m/s。
Drop and the particulate matter of big particle diameter in the flue gas of desulfurization section mainly removed by special pipe demister 3, reduces downstream specific panel group demister load。
Specific panel group demister 3 adopts High efficiency baffle plate, processes more than 10 microns drops and particulate matter。
One-level rinses water layer 4, two grades flushing water layer 7 and three grades of flushing water layers 8 are connected to wash tub pipe 5。
One-level rinses water layer 4 for one-level specific panel group demister 6 bottom is rinsed, two grades are rinsed water layer 7 for one-level specific panel group demister 6 top is rinsed, three grades are rinsed water layer 8 for two grades of specific panel group demisters 9 are rinsed, to ensure the performance of demister。
The drop of more than 10 microns in flue gas can effectively be removed by the specific panel group demister constituted accordingly, and its process is as follows:
Flue gas can carry after the material such as drop and dirt rises to special pipe demister 3, drop and particulate matter that wherein most particle diameter is bigger are captured, special pipe has self-cleaning ability, without arranging flushing water layer, flue gas is then through one-level specific panel group demister 6 and two grades of specific panel group demisters 9, wherein the drop of more than 10 microns is removed, and makes droplet content in flue gas be reduced to 50mg/m3, dust content is reduced to 10mg/m3。
Referring to Fig. 1 and Fig. 5, falling liquid film washing section matches with specific panel group demister, and it is for being removed by more than in flue gas 1 micron drop, it is ensured that in flue gas, droplet content is less than 30mg/m3, and dust content is less than 5mg/m3。
Falling liquid film washing section includes washing water catcher 10, loose fiber bed 11, drip washing water pipe 12, drip washing tank 13, water inlet 14, wastewater discharge pipe 15, water washing cycles pipe 16, fresh water filling pipe 17, water washing cycles pump 18 and water washing cycles groove 19。
Washing water catcher 10 follows two grades of specific panel group demisters 9 closely and arranges, and washing water is collected in its effect。Adopt sloping plate type structure。
Loose fiber bed 11 follows washing water catcher 10 closely and arranges, be falling liquid film washing section realize vapour-liquid contact major part, fine droplet and fine particulates and fiber surface collide and rebound, because loose fiber bed accessory has big specific surface area, the collision probability of fine droplet and fine particulates in flue gas can be increased, increasing with the contact probability of washing water, dirt in flue gas and aerosol can increase and trapped by loose fiber bed 11 simultaneously。
Loose fiber bed adopts modular construction, fiber bed surface gas speed 0.5～2.5m/s。Washing section liquid-gas ratio is not less than 0.05L/m3。
Loose fiber bed 11 specifically includes the wet district 001 of loose fiber, interior purchasing ore 002, and loose fiber does district 003, and loose fiber does district's supporting layer 004, upper cover plate 005 and drip washing water hole 006。
Fibre bed upper cover plate 005 is provided with drip washing tank 13, and sink top is provided with water inlet 14, is connected with drip washing water pipe 12 on desulfurizing tower, and upper cover plate 005 is provided with flushing water hole 006, percent opening 10～50%, water hole diameter 3～15mm。
Water washing cycles tank 19 is washing water storage tank, and in water-washing process, the PH of water constantly reduces, and water washing tank should adopt corrosion-resistant material, available Leak-tight liner material (line with rubber, lining PO etc.), or all-plastic material。Water washing cycles tank volume ensures the time of staying of 5～15min under water washing cycles pump 18 flow。
Water washing cycles pump 18 need to adopt corrosion-resistant material, and flow is determined according to elution circuit liquid-gas ratio, and lift need to ensure elution circuit 2～3barg pressure。
Washing water is stored in water washing cycles tank 19, washing water forms closed-loop path by drip washing water pipe 12, drip washing tank 13, water inlet 14, loose fiber bed 11, washing water catcher 10, water washing cycles pipe 16, water washing cycles pump 18 and water washing cycles groove 19, waste water is discharged by wastewater discharge pipe 13, fresh water is filled into by fresh water filling pipe 17, and the waste water of generation enters wastewater treatment or desulphurization system uses。
The falling liquid film washing section constituted accordingly, it matches with specific panel group demister, it is possible to effectively removing more than 1 micron drop in flue gas, detailed process is as follows:
The scrubbed water collector of flue gas enters loose fiber Chuan Shi district 001, washing water is under the drainage of fiber, water membrane is formed at fiber surface, loose fiber bed 11 has big specific surface area, considerably increase vapour-liquid contact area, fine droplet and fine particulates in flue gas are easier to be captured and increase, drop after increase and fine particulates are after falling liquid film washing section, enter loose fiber Chuan Gan district 003, drop and fine particulates are easier to be collided by superhydrophobic fibers and rebound, increase with other drops in flue gas and fine particulates collision rift, after the coalescence effect of loose fiber bed 11, in tail gas, more than 1 micron drop removal efficiency is up to more than 95%, ensure that in exiting flue gas, droplet content is less than 30mg/m3, dust content is less than 5mg/m3。
Based on the falling liquid film water wash system that such scheme is constituted, it may be achieved Desulphurization for Coal-fired Power Plant tail gas minimum discharge, concrete process following (referring to Fig. 1 to Fig. 5):
Former flue gas is after absorber portion 1, realize vapour-liquid with absorbent to contact, absorbent falls into cyclic absorption liquid pool 2, the air liquid level that circulating absorption solution is blasted by aeration tube 02 in aeration zone 01 gets a promotion, zoneofoxidation 07 is entered after overflow plate 04, the liquid that absorbs after oxidation enters inclined plate sedimentation district 05 under the effect of deflector 06, experimental solids granule sharp separation, absorb liquid clear liquid overflow and enter clear liquid area 08, serosity entrance absorption liquid mixed zone 09 enters aeration zone 01 to realize self-loopa after mixing with fresh slurry after deflector 06 and baffle plate 03；
Flue gas can carry after the material such as drop and dirt rises to special pipe demister 3, drop and particulate matter that wherein most particle diameter is bigger are captured, special pipe has self-cleaning ability, without arranging flushing water layer, flue gas is then through one-level specific panel group demister 6 and two grades of specific panel group demisters 9, wherein the drop of more than 10 microns is removed, and makes droplet content in flue gas be reduced to 50mg/m3, and dust content is reduced to 10mg/m3；
After the scrubbed water collector 10 of flue gas after primary purifying, enter loose fiber Chuan Shi district 001, washing water is under the drainage of fiber, water membrane is formed at fiber surface, loose fiber bed 11 has big specific surface area, considerably increase vapour-liquid contact area, fine droplet and fine particulates in flue gas are easier to be captured and increase, drop after increase and fine particulates are after falling liquid film washing section, enter loose fiber Chuan Gan district 003, drop and fine particulates are easier to be collided by superhydrophobic fibers and rebound, increase with other drops in flue gas and fine particulates collision rift, after the coalescence effect of loose fiber bed 11, in tail gas, more than 1 micron drop removal efficiency is up to more than 95%, ensure that in exiting flue gas, droplet content is less than 30mg/m3, dust content is less than 5mg/m3。
The concrete application implementation of the present invention is presented herein below:
Implement 1
For the ammonia process desulfuration tower of power plant for self-supply's 2X140t/h coal-burning boiler, exhaust gas volumn 394252Nm3/ h, equipment importation droplet content 150～200mg/m3, dust content 20mg/m3, adopt liquefied ammonia to make desulfurizing agent。
Former flue gas is after absorber portion 1, realize vapour-liquid with absorbent to contact, absorbent falls into cyclic absorption liquid pool 2, the air liquid level that circulating absorption solution is blasted by aeration tube 02 in aeration zone 01 gets a promotion, zoneofoxidation 07 is entered after overflow plate 04, the liquid that absorbs after oxidation enters inclined plate sedimentation district 05 under the effect of deflector 06, experimental solids granule sharp separation, absorb liquid clear liquid overflow and enter clear liquid area 08, after serosity entrance absorption liquid mixed zone 09 mixes with fresh slurry, aeration zone 01 is entered to realize self-loopa after deflector 06 and baffle plate 03, flue gas can carry after the material such as drop and dirt rises to special pipe demister 3, drop and particulate matter that wherein most particle diameter is bigger are captured, special pipe has self-cleaning ability, without arranging flushing water layer, flue gas is then through one-level specific panel group demister 6 and two grades of specific panel group demisters 9, wherein the drop of more than 10 microns is removed, droplet content in flue gas is made to be reduced to 50mg/m3, dust content is reduced to 10mg/m3, after the scrubbed water collector 10 of flue gas after primary purifying, enter loose fiber Chuan Shi district 001, washing water is under the drainage of fiber, water membrane is formed at fiber surface, loose fiber bed 11 has big specific surface area, considerably increase vapour-liquid contact area, fine droplet and fine particulates in flue gas are easier to be captured and increase, drop after increase and fine particulates are after falling liquid film washing section, enter loose fiber Chuan Gan district 003, drop and fine particulates are easier to be collided by superhydrophobic fibers and rebound, increase with other drops in flue gas and fine particulates collision rift, after the coalescence effect of loose fiber bed 11, in tail gas, more than 1 micron drop removal efficiency is up to more than 95%, ensure that in exiting flue gas, droplet content is less than 30mg/m3, dust content is less than 5mg/m3。
For ensureing that specific panel group demister dirt will not deposit fouling, one-level is set and rinses water layer 4, two grades and rinse water layer 7 and three grades and rinse water layers 8, flushing water at regular time and quantity by wash tub pipe 5, demister is rinsed。
Washing water is stored in water washing cycles tank 19, washing water passes through drip washing water pipe 12, drip washing tank 13, water inlet 14, loose fiber bed 11, washing water catcher 10, water washing cycles pipe 16, water washing cycles pump 18, water washing cycles groove 19, form closed-loop path, waste water is discharged by wastewater discharge pipe 13, fresh water is filled into by fresh water filling pipe 17, and the waste water of generation enters wastewater treatment or desulphurization system uses。
Specific panel group demister and falling liquid film washing section are arranged on desulfurizing tower tower top, and specific panel group demister is arranged on desulfurizing tower absorber portion, and falling liquid film washing section is arranged on specific panel group demister, undertakes respective function。
Device principal character:
1) self-loopa absorbs liquid pool 2
Self-loopa absorbs and absorbs flow velocity 3m/s in liquid pool。
2) special pipe demister 3,6, two grades of specific panel group demisters 9 of one-level specific panel group demister
Special pipe demister 3 is arranged immediately following desulfurizing tower absorber portion, one-level specific panel group demister 6 rinses water layer 4 immediately following one-level and arranges, two grades of specific panel group demisters 9 rinse water layer 8 immediately following three grades and arrange, special pipe has self-cleaning function, specific panel group adopts High efficiency baffle plate, every grade adopts 3 layers of deflection plate, and material adopts and strengthens PP。Flue gas flow velocity in demister is 3.5m/s。
3) washing water catcher 10
Washing water catcher 10 follows two grades of specific panel group demisters 9 closely and arranges, and washing water is collected in its effect。Adopt sloping plate type structure, diameter 8.8m, swash plate spacing 50mm。
4) loose fiber bed 11
Fibre bed external diameter 700mm, length 1000mm, fibre bed upper cover plate drip washing water hole percent opening 50%, bore dia 6mm, liquid-gas ratio 0.3L/m3。
5) water washing cycles tank 19
Water washing cycles tank 19 adopts PP material。Tank volume 30m3。
6) water washing cycles pump 18
Water washing cycles pump 18 adopts Q345R line with rubber material, flow 120m3/ h, lift 60m。
Operational factor and result:
Each layer flushing water rinses once per hour, and every layer point 4 pieces are rinsed region, and instantaneous washing water quantity is from ground floor to third layer respectively 45m3/h、30m3/h、23m3/ h, to system water supplement 6.5m3/h。
Effect: droplet content 30mg/m in neat stress3, dust content 4mg/m3。
Implement 2
For the calcium method desulfurizing tower of power plant for self-supply's 2X140t/h coal-burning boiler, exhaust gas volumn 450000Nm3/h, equipment importation droplet content 150～200mg/m3, dust content 30mg/m3, adopt lime white to make desulfurizing agent。
Specific panel group demister and falling liquid film washing section are arranged on desulfurizing tower tower top,
Former flue gas is after absorber portion 1, realize vapour-liquid with absorbent to contact, absorbent falls into and can carry after the material such as drop and dirt rises to special pipe demister 3 in cyclic absorption liquid pool 2, flue gas, drop and particulate matter that wherein most particle diameter is bigger are captured, special pipe has self-cleaning ability, it is not necessary to arrange flushing water layer, and flue gas is then through one-level specific panel group demister 6 and two grades of specific panel group demisters 9, wherein the drop of more than 10 microns is removed, and makes droplet content in flue gas be reduced to 50mg/m3, dust content is reduced to 10mg/m3, after the scrubbed water collector 10 of flue gas after primary purifying, enter loose fiber Chuan Shi district 001, washing water is under the drainage of fiber, water membrane is formed at fiber surface, loose fiber bed 11 has big specific surface area, considerably increase vapour-liquid contact area, fine droplet and fine particulates in flue gas are easier to be captured and increase, drop after increase and fine particulates are after falling liquid film washing section, enter loose fiber Chuan Gan district 003, drop and fine particulates are easier to be collided by superhydrophobic fibers and rebound, increase with other drops in flue gas and fine particulates collision rift, after the coalescence effect of loose fiber bed 11, in tail gas, more than 1 micron drop removal efficiency is up to more than 95%, ensure that in exiting flue gas, droplet content is less than 30mg/m3, dust content is less than 5mg/m3。
For ensureing that specific panel group demister dirt will not deposit fouling, one-level is set and rinses water layer 4, two grades and rinse water layer 7 and three grades and rinse water layers 8, flushing water at regular time and quantity by wash tub pipe 5, demister is rinsed。
Washing water is stored in water washing cycles tank 19, washing water passes through drip washing water pipe 12, drip washing tank 13, water inlet 14, loose fiber bed 11, washing water catcher 10, water washing cycles pipe 16, water washing cycles pump 18, water washing cycles groove 19, form closed-loop path, waste water is discharged by wastewater discharge pipe 13, fresh water is filled into by fresh water filling pipe 17, and the waste water of generation enters wastewater treatment or desulphurization system uses。
Device principal character:
1) self-loopa absorbs liquid pool 2
Self-loopa absorbs and absorbs flow velocity 4m/s in liquid pool。
2) special pipe demister 3,6, two grades of specific panel group demisters 9 of one-level specific panel group demister
Special pipe demister 3 is arranged immediately following desulfurizing tower absorber portion, one-level specific panel group demister 6 rinses water layer 4 immediately following one-level and arranges, two grades of specific panel group demisters 9 rinse water layer 8 immediately following three grades and arrange, special pipe has self-cleaning function, specific panel group adopts High efficiency baffle plate, every grade adopts 1 layer of deflection plate, and material adopts and strengthens PP。Flue gas flow velocity in demister is 3m/s。
3) washing water catcher 10
Washing water catcher 10 follows two grades of specific panel group demisters 9 closely and arranges, and washing water is collected in its effect。Adopt sloping plate type structure, diameter 10m, swash plate spacing 60mm。
4) loose fiber bed 11
Fibre bed external diameter 700mm, length 1000mm, fibre bed upper cover plate drip washing water hole percent opening 50%, bore dia 8mm, liquid-gas ratio 0.35L/m3。
5) water washing cycles tank 19
Water washing cycles tank 19 adopts PP material。Tank volume 32m3。
6) water washing cycles pump 18
Water washing cycles pump 18 adopts Q345R line with rubber material, flow 160m3/h, lift 60m。
Operational factor and result:
Each layer flushing water rinses once per hour, and every layer point 4 pieces are rinsed region, and instantaneous washing water quantity is from ground floor to third layer respectively 71m3/h, 47m3/h, 47m3/h, to system water supplement 11m3/h。
Effect: droplet content 30mg/m3 in neat stress, dust content 3.5mg/m3。
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described。Skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; described in above-described embodiment and description is that principles of the invention is described; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements both fall within the claimed scope of the invention。Claimed scope is defined by appending claims and equivalent thereof。
Claims (10)
1. one kind realizes Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film water wash system, it is characterised in that described water wash system includes:
Absorber portion, is provided with the absorbent with smoke contacts in described absorber portion；
Automatic Cycle absorbs liquid pool, and described Automatic Cycle absorbs liquid pool and matches with absorber portion；
Specific panel group demister, described specific panel group demister matches with absorber portion；
Falling liquid film washing section, described falling liquid film washing section matches with specific panel group demister。
2. one according to claim 1 realizes Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film water wash system, it is characterized in that, described Automatic Cycle absorbs liquid pool and includes aeration zone, aeration tube, dividing plate, overflow plate, inclined plate sedimentation district, deflector, zoneofoxidation, clear liquid area, mixed zone and demarcation strip。
3. one according to claim 1 realizes Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film water wash system, it is characterized in that, described specific panel group demister includes the special pipe demister, one-level flushing water layer, one-level specific panel group demister, two grades of flushing water layers, three grades of flushing water layers and the two grades of specific panel group demisters that set gradually。
4. kind according to claim 3 realizes Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film water wash system, it is characterised in that one-level is rinsed and is respectively equipped with flushing pipe on water layer, two grades of flushing water layers and three grades of flushing water layers。
5. one according to claim 1 realizes Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film water wash system, it is characterized in that, described falling liquid film washing section includes wash water catcher, loose fiber bed, drip washing water pipe, drip washing tank, water inlet, wastewater discharge pipe, water washing cycles pipe, fresh water filling pipe, water washing cycles pump and water washing cycles groove。
6. one according to claim 5 realizes Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film water wash system, it is characterized in that, described loose fiber bed includes the wet district of loose fiber, interior purchasing ore, the dry district of loose fiber, loose fiber dry district supporting layer, upper cover plate and drip washing water hole。
7. one kind realizes Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film washing process, it is characterised in that described technique comprises the steps:
(1) flue gas contacts with the absorbent in absorber portion after entering absorber portion, and after contact, flue gas can drop into Automatic Cycle together with absorbent and absorb in liquid pool；
(2) the major part bigger drop of particle diameter in flue gas and flue dust can be removed and obtain new flue gas by Automatic Cycle absorption liquid pool, is then re-entered on absorber portion by flue gas；
(3) flue gas is sent to specific panel group demister by absorber portion, and the drop of more than in flue gas 10 microns is removed by specific panel group demister, and the flue gas after removing is sent to falling liquid film washing section；
(4) flue gas is continued, except matter, to be removed by more than in flue gas 1 micron drop, it is ensured that in flue gas, droplet content is less than 30mg/m3, and dust content is less than 5mg/m3 by falling liquid film washing section。
8. one according to claim 7 realizes Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film washing process, it is characterized in that, flue gas initially enters Automatic Cycle and absorbs the aeration zone in liquid pool, the air liquid level that aeration zone is blasted by aeration tube gets a promotion, zoneofoxidation is entered after overflow plate, the liquid that absorbs after oxidation enters inclined plate sedimentation district under the effect of deflector, experimental solids granule sharp separation, absorb liquid clear liquid overflow and enter clear liquid area, after serosity entrance absorption liquid mixed zone mixes with fresh slurry, aeration zone is entered to realize Automatic Cycle after deflector and baffle plate, thus the major part bigger drop of particle diameter in flue gas and flue dust are removed。
9. one according to claim 7 realizes Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film washing process, it is characterized in that, after flue gas enters special pipe demister, first time rinses water layer and follows special pipe demister closely, rinse direction along flue gas ascent direction, first order specific panel group demister is rinsed, the second level is rinsed water layer and is followed the setting of first order specific panel group demister closely, rinse against flue gas ascent direction, the third level is rinsed water layer and follows second level flushing water layer setting closely, rinse along flue gas ascent direction, second level specific panel group demister follows third level flushing water stratification closely, thus the drop by more than in flue gas 10 microns is removed。
10. one according to claim 6 realizes Desulphurization for Coal-fired Power Plant tail gas minimum discharge falling liquid film washing process, it is characterized in that, flue gas after specific panel group demister preliminary purification can pass through washing water catcher and enter loose fiber Chuan Shi district, washing water is under the drainage of fiber, water membrane is formed at fiber surface, the fine droplet trapped accordingly and increase in flue gas and fine particulates, the drop of more than 1 micron in tail gas is removed, it is ensured that in exiting flue gas, droplet content is less than 30mg/m with this3, dust content is less than 5mg/m3；Washing water is stored in water washing cycles tank simultaneously, washing water forms closed-loop path by drip washing water pipe, drip washing tank, loose fiber bed, washing water catcher, water inlet, water washing cycles pipe, water washing cycles pump and water washing cycles tank, waste water is discharged by wastewater discharge pipe, fresh water is filled into by fresh water filling pipe, and the waste water of generation enters wastewater treatment or desulphurization system uses。
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