CN103657398A - Coal-fired flue gas purification-based runoff wetland system and method for purifying flue gas by using same - Google Patents
Coal-fired flue gas purification-based runoff wetland system and method for purifying flue gas by using same Download PDFInfo
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- CN103657398A CN103657398A CN201310747569.XA CN201310747569A CN103657398A CN 103657398 A CN103657398 A CN 103657398A CN 201310747569 A CN201310747569 A CN 201310747569A CN 103657398 A CN103657398 A CN 103657398A
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Abstract
The invention discloses a coal-fired flue gas purification-based runoff wetland system and a method for purifying flue gas by using the same, and belongs to the technical field of atmospheric pollution ecological management and ecological remediation. The system comprises a wetland ecological system, a wetland hydraulic system and a wetland flue gas intake and distribution system; flue gas is cooled to below 20 DEG C by a heat exchanger, enters a perforated gas distribution tube bundle arranged at the bottom of wetland through a flue gas distribution dry pipe, is uniformly discharged into a wetland substrate layer, is subjected to adsorption, microbe assimilation (SO2, NOx and CO2 are used to construct biosome) and water dissolution of the wetland substrate layer, is subjected to microbe purification and synchronous absorption of wetland plants further in an algal-bacterial symbiotic system on the upper layer of the wetland, and is efficiently purified, the emission of flue gas pollutants is reduced and the greenhouse gas CO2 is efficiently recycled. The runoff wetland is simple in structure and convenient to construct and maintain, and ecological, landscape and energy-saving treatment on urban coal-fired flue gas is realized.
Description
Technical field
The invention belongs to atmosphere pollution ecological management and recovery technique field, relate to a kind of runoff wet land system for coal-fired flue-gas ecological purification and utilize this system to carry out the technique of gas cleaning.
Background technology
The country that coal is main energy sources form be take in China, and the accounting of coal in the energy reaches 70%, thus coal-fired flue-gas to pollute be the important air environmental pollution origin cause of formation, be the chief culprit of haze weather.Along with the raising of the level of urbanization, people are also more and more higher to environmental quality requirement, but urban atmospheric pollution situation in 2013 is very severe, and the haze weather of high pollution has had a strong impact on people's life.Atmosphere pollution SO wherein
2, NO
x, PM severe overweight all.
Traditional coal-fired flue-gas improvement technology comprises:
1, flue gas ash removal: remove the particle (PM) in flue gas.(1) physical method: increase sack cleaner at flue gas afterbody; Water attack dust-removal and desulfurizing, does not have effect but bag-type dusting cost is high to PM2.5, and water attack efficiency of dust collection is low; (2) electrostatic precipitation: at flue gas afterbody, increase electrostatic precipitator, the expensive height of efficiency, but low to PM2.5 removal efficiency.
2, flue gas desulfurization: remove the SO in flue gas
2.(1) chemical method: add desulfurizing agent-dry method desulfuration in furnace, add in proportion desulfurizing agent in fire coal, in combustion process desulfurization, but cost is high to sulphur coal poor removal effect.Wet desulphurization: increase desulfurizing tower at flue gas afterbody, sulfur-containing smoke gas is by the desulfurizing agent of wet fog shape, and vaporific desulfurizing agent is to SO
2formation efficient chemical absorbs, and desulfurized effect is good, and cost is high, can form containing subsequent treatment problems such as new sulfur-containing compound, de-waste water, increases construction costs.
3, denitrating flue gas: the process of removing the total nitrogen oxide of flue gas.
4, electrochemical method synchronized desulfuring and denitrifying: CAEB-EPS technology is to utilize high-power electron beam (0.8 ~ 1MeV) irradiation flue gas, the sulfur dioxide in flue gas is become to a kind of flue gas desulfurization and denitrification technology of ammonium sulfate and ammonium nitrate with conversion of nitrogen oxides.The technological process that the commercial plant of this technology generally adopts flue gas cool-down humidification, ammonification, electron beam irradiation and accessory substance to collect.
Above flue gases purification also needs, to processing such as the flue gas after purifying dehumidify, to reduce the moisture content of flue gas except the necessary treatment facility increasing at flue gas afterbody, guarantees the rising height of flue gas.Construction and operating cost are high, and especially the operating cost of denitration is high, is difficult to carry out.Runoff Wetland ecological method synchronized dust removal, desulphurization denitration are proposed for this reason, CO
2the ecological flue gases purification reducing discharging.
Runoff wetland is the conventional ripening technology of sewage disposal, can effectively remove the pollutants such as N, P in water body, COD, heavy metal, in order there to be PM, the SO in effective purifying smoke
2, NO
x, CO
2, heavy metal etc., after first coal-fired flue-gas lowers the temperature by heat exchanger, by gas distributing pipeline, pass in wetland water body, in the matrix of wetland forms absorption and water body, form effectively dissolving, due to SO
2, CO
2itself all has good hydrophily, soluble in water, can adopt Wetland ecological purification techniques after water-soluble, removes the pollutant in flue gas.Simultaneously in order to improve the treatment effeciency of wetland, matrix to wetland improves, form efficient matrix adsorption layer, in water body, increase bionic aquatic weed simultaneously, bionic aquatic weed becomes the carrier material of microorganism, algal grown, improve effective biomass of wet land system, the apposition growth that makes full use of denitrifying bacteria, sulfuration bacterium, algae is specific, increases the density of microorganism, improves the treatment effeciency of runoff wetland.Form matrix and adsorb the dissimilation of synchronous wetland microbial assimilation, the pollutant in wetland plant absorption, decomposing, purifying flue gas.
Tradition is for the runoff wetland of sewage disposal, the matrix such as loam, sandstone is poor to the absorption immobilization effect of each pollutant of flue gas, as low in sulfuration bacterium, denitrifying bacteria, algae concentration for the special efficacy microorganism of the purification in flue gas in water body, effective purifying smoke.Therefore for the object of gas cleaning, traditional runoff wetland is improved, has been proposed based on purifying coal-fired flue gas runoff wet land system.
Summary of the invention
Runoff wetland for tradition for sewage disposal, the matrix such as loam, sandstone is poor to the absorption immobilization effect of each category feature pollutant of flue gas, as low in sulfuration bacterium, denitrifying bacteria, algae concentration for the special efficacy microorganism of the purification in flue gas in water body, the effective function of purifying smoke, the invention provides a kind of runoff wet land system for purifying coal-fired flue gas and utilize it to carry out the method for runoff wetland purification flue gas, solving these problems technically.
The object of the invention is to be achieved through the following technical solutions:
Based on a purifying coal-fired flue gas runoff wet land system, comprise wetlands ecosystems, wetland Hydraulic Power System, three parts of wetland flue gas inlet air distribution system, wherein:
Described wetlands ecosystems comprise wetland, Wetland Substrate layer, wetland bionic aquatic weed filler and the wetland plant consisting of dam body and base plate, the pond that wetland main body surrounds for the dam facing by dam body, on wetland base plate, lay Wetland Substrate layer, in pond, be provided with wetland bionic aquatic weed filler and wetland plant;
Described wetland Hydraulic Power System comprises into water main, water inlet horizontal branch pipe group, water outlet horizontal branch pipe group, catchment tray and arterial drainage, water inlet main enters from wetland front top, enter wetland main body rear steering for parallel with dam facing, along dam facing, stretch into wetland bottom, in bottom, turn to after being parallel to base plate and be connected with water inlet horizontal branch pipe group, water outlet horizontal branch pipe group is positioned at the top of wetland end, and water outlet horizontal branch pipe group is directly inserted the catchment tray that is positioned at dam body outside, and catchment tray is connected with arterial drainage;
Described wetland flue gas inlet air distribution system comprises flue gas air inlet main and the tube bank of perforation gas distribution, and flue gas gas distribution main bottom and perforation gas distribution at wetland after wetland front end is pressed close to base plate to penetrate wetland restrained vertical being connected.
A method of utilizing above-mentioned wet land system to carry out the gas cleaning of runoff wetland, its technical process is:
(1) water enters wetland bottom through water inlet main, in bottom, through water inlet horizontal branch pipe group, be formed on the Multipoint Uniform water inlet of wetland bottom, water is in the diffusion of Wetland Substrate bottom, the movable water surface to wetland top, form flowing from front to back, arrive wetland afterbody, through being positioned at after the water outlet horizontal branch pipe group at wetland top is collected the multiple spot of water, enter catchment tray, through arterial drainage, enter surface water body;
(2) flue gas is reduced to below 20 degree through heat exchange temperature, through flue gas gas distribution main enter be arranged on wetland bottom the tube bank of perforation gas distribution evenly discharge enter Wetland Substrate layer, by the absorption of Wetland Substrate layer, microbial assimilation effect, water body dissolves, and further the microorganism by the growth of swimming on wetland upper strata be attached to the helotisn ecosystem that the microorganism on bionic aquatic weed filler forms jointly in further purify, the synchronous absorption of wetland plant, high-efficient purification flue gas, forms flue gas pollutant and reduces discharging and greenhouse gases CO
2high efficiente callback.
In above-mentioned technical process, hydraulic load is 1m
3/ m
2, flue gas load is unit area loading 10m
3flue gas/1m
2.
The present invention is based on the runoff wetland purification system structure design of coal-fired flue-gas, adopt front bottom end water inlet, the footpath fluidity wetland hydraulic flow state of top, rear end water outlet.Than prior art, tool of the present invention has the following advantages:
1, the Wetland ecological of realizing coal-fired flue-gas is administered and is purified, and construction cost is low, and operating cost is low, long-lasting good, and landscape effect is good; The waste heat of high-temperature flue gas can also guarantee the winter operation of wetland, forms the green wetland landscape of characteristic in winter.
2, runoff wetland is at the SO of purifying smoke
2, NO
x, when PM, heavy metal, can also gather in the crops algae, wetland plant reed, as living beings second development and utilization.
3, runoff wetland structure is simple, construction maintenance convenient, realizes city coal-fired flue-gas and administers ecology, landscape, energy-saving.
4, utilize this facility can realize energy recovery, low energy consumption, long-acting purification coal-fired flue-gas especially SO2, NOx, PM2.5, heavy metal, the greenhouse gases (CO2, CO etc.) of the flue gas of coal-burning power plant's discharge.Runoff wetland can synchronous purification rainfall runoff in purifying smoke, sanitary sewage, has good view and ecological Efficiency simultaneously.
5, the runoff wetland the present invention relates to flows into flue gas SO
2purification efficiency higher than 95%; NO
xhigher than 85%, PM2.5 higher than 98%.
6,, for more abundant nutrition material is provided, organic matter, P etc., can select the sewage of sewage treatment plant's secondary discharge as wetland water, synchronously realizes the tertiary treatment deep purifying to sewage, realizes the recycling of sewage.
Accompanying drawing explanation
Fig. 1 is the floor plan based on purifying coal-fired flue gas runoff wet land system;
Fig. 2 is that the 1-1 of Fig. 1 is to profile;
Fig. 3 is that the 2-2 of Fig. 1 is to profile;
Fig. 4 is the structural representation of perforation gas distribution tube bank;
Fig. 5 is that the b-b of Fig. 4 is to profile.
The specific embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is further described; but be not limited to this; every technical solution of the present invention is modified or is equal to replacement, and not departing from the spirit and scope of technical solution of the present invention, all should be encompassed in protection scope of the present invention.
The specific embodiment one: as Figure 1-3, present embodiment based on purifying coal-fired flue gas runoff wet land system, comprise wetlands ecosystems, wetland Hydraulic Power System, three parts of wetland flue gas inlet air distribution system, wherein:
Described wetlands ecosystems comprise wetland, Wetland Substrate layer, wetland bionic aquatic weed filler 2-8 and wetland plant 2-6, wetland structure consists of dam body 2-1 and base plate 2-2, and Wetland Substrate layer, wetland bionic aquatic weed filler 2-8, wetland plant 2-6 form wetlands ecosystems.Wetland main body serve as reasons four sides 45 degree put the pond that slope dam facing surrounds, above wetland base plate 2-2, be equipped with Wetland Substrate layer, in pond, be provided with wetland bionic aquatic weed filler 2-8 and wetland plant 2-6;
Described wetland Hydraulic Power System comprises into water main 1-1, water inlet horizontal branch pipe group 1-2, water outlet horizontal branch pipe group 1-3, catchment tray 1-4 and arterial drainage 1-5, water inlet main 1-1, water inlet horizontal branch pipe group 1-2 form wetland water inlet water distribution system, and water outlet horizontal branch pipe group 1-3, catchment tray 1-4 and arterial drainage 1-5 form wetland effluent water distribution system.Water inlet main 1-1 enters from wetland front top, after entering wetland main body, by elbow, turn to as parallel with dam facing, along dam facing, stretch into wetland bottom, in bottom, by elbow, turn to and be parallel to wetland base plate 2-2, water inlet main 1-1 is connected with the horizontal transverse-pipe 1-1-2 perpendicular to water inlet main 1-1 by threeway 1-1-1, transverse tube 1-1-2 is upper connects by threeway the water inlet horizontal branch pipe group 1-2 that the water distributor that is parallel to each other by a plurality of levels forms, water inlet horizontal branch pipe group 1-2 fixes by fixed support pier 1-6, the end of water distributor is connected with horn mouth 1-1-3 by elbow, a water outlet horizontal branch pipe group 1-3 high position is installed on the top of wetland end, water outlet horizontal branch pipe group 1-3 is parallel to base plate perpendicular to wetland end wall, water outlet horizontal branch pipe group 1-3 directly inserts the catchment tray 1-4 that is positioned at dam body 2-1 outside, realizing draining collects in catchment tray 1-4, and enter surface water body by the arterial drainage 1-5 draining being connected with catchment tray 1-4.Catchment tray 1-4 is reinforced concrete structure, and the width of length and wetland is suitable.
Water enters wetland bottom through water inlet main 1-1, in bottom, through a plurality of water inlet horizontal branch pipe group 1-2, is formed on the water inlet of wetland front bottom end Multipoint Uniform.Water is in the diffusion of Wetland Substrate bottom, to the movable water surface at wetland top, form flowing from front to back, arrive wetland afterbody, through being positioned at after the water outlet horizontal branch pipe group 1-3 at wetland top collects the multiple spot of water, enter catchment tray 1-4, through arterial drainage 1-5, enter surface water body.
Described wetland flue gas inlet air distribution system comprises flue gas air inlet main 3-1 and perforation gas distribution tube bank 3-2, and this system is used for purifying coal-fired flue-gas, unit area loading 10m
3flue gas/1m
2.Flue gas gas distribution main 3-1, at wetland front end, enters flue gas higher than a high position for water surface site, presses close to base plate 2-2 penetrate wetland by elbow and standpipe 3-1-1 at wetland front end, parallel along the elongated laying of wetland length direction in wetland bottom.3-2 is vertical is connected in the bottom of wetland and the tube bank of level perforation gas distribution for flue gas gas distribution main 3-1.Flue gas is entered by flue gas gas distribution main 3-1, diffuses into the hypothallus of wetland bottom through perforation gas distribution tube bank 3-2.Through matrix absorption and wetlands ecosystems, purify, realize the advanced treating to pollutant.Position of opening and the size of the tube bank of perforation gas distribution are shown in Fig. 4-5.
High-temperature flue gas is cooled to below 20 degree through heat exchanger, through being arranged in the perforation gas distribution tube bank of Wetland Substrate bottom, evenly discharging and enter Wetland Substrate layer, through Wetland Substrate absorption biological cleaning pollutant, microbiologic population on while bionic aquatic weed, helotisn aquatic ecosystem further purifies and is dissolved in the SO in water body
2, NO
x, CO
2(SO
2, NO
2, CO
2soluble in water), further, there is flourishing root system wetland plant and synchronously absorb SO
2, NO
x, these abundant ecosystem synergies realize high effective flue gas and purify.
The specific embodiment two: in present embodiment, the dam body 2-1 of described runoff wetland and base plate 2-2 all adopt the cubic metre of earth and stone to add anti-seepage geotextile formation.Dam body 2-1 is rammed earth, upper berth anti-seepage geotextile, and surface is the bank protection that cyclopean concrete 300mm is thick.Wetland base plate 2-2 is identical with the structure of dam body 2-1.Dam body 2-1 is highly greater than 1m.
The specific embodiment three: in present embodiment, described Wetland Substrate layer consists of wetland flue gas adsorbing base layer 2-3 and wetland nutrition loam layer 2-4.Wetland flue gas adsorbing base layer 2-3 is porous media spherulitic texture slag, be layed on base plate 2-2, in order to realize the pollutant in the biochemistry assimilation purifying smoke after absorption, control structure matrix is the spherolite of diameter 2-5cm, the porosity of spherolite is 70%, the diameter of eyelet is at 3-5 micron, and according to the concentration of pollutant in inlet flue gas, selecting the thickness of matrix is 30-50cm, is conducive to vulcanize bacterium, denitrifying bacteria enters hypothallus and realizes microbial biochemical assimilation process; Wetland nutrition loam layer 2-4 is loam, is layed on wetland flue gas adsorbing base layer 2-3, and thickness is between 5cm-10cm.
The specific embodiment four: in present embodiment, in order further to improve immobilization and to be dissolved in the SO in water body
2, NO
x, CO
2purification, mobile phase at runoff wetland increases bionic aquatic weed biologic packing material 2-8, bionic aquatic weed filler 2-8 adopts that to take spandex and nylon be main superfine fibre braiding flaky material, wide 5cm, length can be according to the degree of depth adjustment of water, to increase sulfuration bacterium, the denitrifying bacteria of apposition growth, the biomass of micro-algae, realize efficient biochemical purifying smoke effect, especially a large amount of micro-algaes can utilize CO under the effect of light
2, build life entity, realize greenhouse gases and reclaim.Wetland bionic aquatic weed filler 2-8 is hung and is fixed in wetland water body by static line 2-7 and spud pile 2-5.This filler, for algae and growth of microorganism provide carrier, improves the biomass of system, the biomass of this system be there is no a carrier filler biomass 10-20 doubly, and then improve the purification efficiency of system.
The specific embodiment five: in present embodiment, for the demand of gas cleaning, wetland plant 2-6 selects special efficacy to SO
2, NO
xthe reed that tolerance is strong, the planting density of reed is 2 strains/m
2.Reed has the especially resistance to SO of good anti-pollution characteristic
2, and its flourishing root system pollutant (S, N etc. are as the important element of synthetic protein) that effectively absorption base adsorbs and water body dissolves.
Claims (10)
1. based on purifying coal-fired flue gas runoff wet land system, it is characterized in that described system comprises wetlands ecosystems, wetland Hydraulic Power System, three parts of wetland flue gas inlet air distribution system, wherein:
Described wetlands ecosystems comprise wetland, Wetland Substrate layer, wetland bionic aquatic weed filler and the wetland plant consisting of dam body and base plate, the pond of wetland main body for being surrounded by dam facing, on wetland base plate, lay Wetland Substrate layer, wetland bionic aquatic weed filler and plantation wetland plant are installed in wetland water body;
Described wetland Hydraulic Power System comprises into water main, water inlet horizontal branch pipe group, water outlet horizontal branch pipe group, catchment tray and arterial drainage, water inlet main enters from wetland front top, enter wetland main body rear steering for parallel with dam facing, along dam facing, stretch into wetland bottom, in bottom, turn to after being parallel to base plate and be connected with water inlet horizontal branch pipe group, water outlet horizontal branch pipe group is positioned at the top of wetland end, and water outlet horizontal branch pipe group is directly inserted the catchment tray that is positioned at dam body outside, and catchment tray is connected with arterial drainage;
Described wetland flue gas inlet air distribution system comprises flue gas air inlet main and the tube bank of perforation gas distribution, flue gas gas distribution main in the bottom and perforation gas distribution vertical being connected of tube bank of wetland, is formed on wetland bottom Multipoint Uniform distribution flue gas after wetland front end is pressed close to base plate to penetrate wetland.
2. according to claim 1 based on purifying coal-fired flue gas runoff wet land system, it is characterized in that described dam body and base plate all adopt the cubic metre of earth and stone to add anti-seepage geotextile and form.
3. according to claim 1 based on purifying coal-fired flue gas runoff wet land system, it is characterized in that described dam body is rammed earth, upper berth anti-seepage geotextile, surface is the bank protection that cyclopean concrete 300mm is thick, dam body height is greater than 1m.
4. according to claim 1 based on purifying coal-fired flue gas runoff wet land system, it is characterized in that described Wetland Substrate layer consists of wetland flue gas adsorbing base layer and wetland nutrition loam layer, wetland flue gas adsorbing base layer is layed on base plate, and wetland nutrition loam layer is layed on wetland flue gas adsorbing base layer.
5. according to claim 4 based on purifying coal-fired flue gas runoff wet land system, it is characterized in that described wetland flue gas adsorbing base layer is porous media spherulitic texture slag, spherolite diameter is 2-5cm, and the porosity of spherolite is 70%, and the diameter of eyelet is at 3-5 micron.
6. according to claim 4 based on purifying coal-fired flue gas runoff wet land system, it is characterized in that described wetland nutrition loam layer is loam, paving thickness is between 5cm-10cm.
7. according to claim 1 based on purifying coal-fired flue gas runoff wet land system, it is characterized in that described bionic aquatic weed filler adopts that to take spandex and nylon be main superfine fibre braiding flaky material, wide 5cm.
8. according to claim 1 based on purifying coal-fired flue gas runoff wet land system, it is characterized in that described wetland plant is reed.
9. according to claim 8 based on purifying coal-fired flue gas runoff wet land system, the planting density that it is characterized in that described reed is 2 strains/m
2.
10. utilize the method for carrying out gas cleaning based on purifying coal-fired flue gas runoff wet land system described in the arbitrary right of claim 1-9, it is characterized in that described method step is as follows:
(1) water enters wetland bottom through water inlet main, in bottom, through water inlet horizontal branch pipe group, be formed on the Multipoint Uniform water inlet of wetland bottom, water is in the diffusion of Wetland Substrate bottom, the movable water surface to wetland top, form flowing from front to back, arrive wetland afterbody, through being positioned at after the water outlet horizontal branch pipe group at wetland top is collected the multiple spot of water, enter catchment tray, through arterial drainage, enter surface water body;
(2) flue gas is reduced to below 20 degree through heat exchange temperature, through flue gas gas distribution main enter be arranged on wetland bottom the tube bank of perforation gas distribution evenly discharge enter Wetland Substrate layer, by the absorption of Wetland Substrate layer, microbial assimilation effect, water body dissolves, and further the microorganism by the growth of swimming on wetland upper strata be attached to the helotisn ecosystem that the microorganism on bionic aquatic weed filler forms jointly in further purify, the synchronous absorption of wetland plant, high-efficient purification flue gas, forms flue gas pollutant and reduces discharging and greenhouse gases CO
2high efficiente callback.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107998874A (en) * | 2017-12-19 | 2018-05-08 | 南京科技职业学院 | A kind of artificial swamp VOCs exhaust gas purifying methods and system |
| CN108325373A (en) * | 2018-01-26 | 2018-07-27 | 安徽金源农林专业合作社 | A kind of organic waste-water treating apparatus |
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|---|---|---|---|---|
| CN101012089A (en) * | 2007-01-26 | 2007-08-08 | 华中科技大学 | Deep-bed wetland programmed stepped water distributing device |
| CN201065368Y (en) * | 2007-03-23 | 2008-05-28 | 王丽 | Radial flow type bionic ecological wet land |
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2013
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012089A (en) * | 2007-01-26 | 2007-08-08 | 华中科技大学 | Deep-bed wetland programmed stepped water distributing device |
| CN201065368Y (en) * | 2007-03-23 | 2008-05-28 | 王丽 | Radial flow type bionic ecological wet land |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107998874A (en) * | 2017-12-19 | 2018-05-08 | 南京科技职业学院 | A kind of artificial swamp VOCs exhaust gas purifying methods and system |
| CN107998874B (en) * | 2017-12-19 | 2020-12-15 | 南京科技职业学院 | Constructed wetland VOCs waste gas purification method and system |
| CN108325373A (en) * | 2018-01-26 | 2018-07-27 | 安徽金源农林专业合作社 | A kind of organic waste-water treating apparatus |
| CN108325373B (en) * | 2018-01-26 | 2021-03-19 | 安徽金源农牧科技有限公司 | Organic wastewater treatment device |
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