CN204502755U - A kind of wet method removes the device of sulfur dioxide in flue gas and nitrogen oxide - Google Patents
A kind of wet method removes the device of sulfur dioxide in flue gas and nitrogen oxide Download PDFInfo
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- CN204502755U CN204502755U CN201520188102.0U CN201520188102U CN204502755U CN 204502755 U CN204502755 U CN 204502755U CN 201520188102 U CN201520188102 U CN 201520188102U CN 204502755 U CN204502755 U CN 204502755U
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Abstract
The utility model relates to the device that a kind of wet method removes sulfur dioxide in flue gas and nitrogen oxide, comprises desulfurizing tower, desulfuration recycle pump, gypsum excavationg pump, denitrating tower, denitration circulating pump, denitrfying agent excavationg pump, gypsum dehydration system, denitrfying agent regenerative system.Described desulfurizing tower is band porous plate spray column, and comprise smoke inlet, exhanst gas outlet, mist separator of desulfurization and spraying layer, described gypsum dehydration system is technique and the device of existing general maturation; Described desulfurizing tower outlet is connected with denitrating tower import by flue between tower.Denitrating tower is packed tower, comprises smoke inlet, exhanst gas outlet, denitration demister, packing layer, liquid distribution trough.Described denitrfying agent regenerative system comprises regeneration tank, depositing reservoir, denitrfying agent return pump; The utility model adopts double-column in series, first allows flue gas by desulfurizing tower, enters denitrating tower again, in denitrating tower, remove nitrogen oxide by denitrfying agent in desulfurizing tower after scrubbing CO_2.
Description
Technical field
The utility model relates to a kind of device of new flue gas desulfurization and denitrification, and particularly a kind of wet method removes the device of sulfur dioxide in flue gas and nitrogen oxide.
Background technology
Along with China's economy increases fast, air environmental pollution problem is day by day serious, acid rain and gray haze serious harm human health and existence.2013, State Council has issued " suggestion about accelerating development energy-conserving and environment-protective industry " (No. (2013) 30, promulgated by the State Council) and " prevention and control of air pollution action plan " (No. (2013) 37, promulgated by the State Council), before requiring on July in 2017 1, all heat power plant boiler flue gas SO
2concentration of emission drops to 100mg/m
3below, the power-plant flue gas SO in key area (Beijing-Tianjin-Tangshan, the Yangtze River Delta, Pearl River Delta, each one, big city, two wires)
2concentration of emission is reduced to 50mg/m
3below.According to statistics, only thermal power industry, before 2017, the whole nation just has 20,000 multiple stage units to be badly in need of realizing the transformation of above-mentioned deep desulfuration.
At present, the flue gas desulfurization technique of countries in the world exploitation has kind more than 200, and wherein commercialization has kind more than 20.Whether add water by sweetening process and the dry wet form of desulfurization product, wet method, semidry method and dry method three class technique can be divided into.Wherein dry desulfurization mainly contains the techniques such as in-furnace calcium spraying, RCFB, active carbon desulfurization, semidry method mainly contains the technique such as NID, rotary spraying and drying, and wet method mainly contains the techniques such as lime stone (lime) gypsum, ammonia process, magnesium processes, seawater method, Dual alkali.
The selective non-catalytic reduction of denitrating flue gas (removing nitrogen oxide) common technology (SelectiveNon-Catalytic Reduction, be called for short SNCR) and SCR (Selective CatalyticReduction is called for short SCR).
Flue gas scrubbing CO_2 and nitrogen oxide adopt SCR or SNCR denitration substantially both at home and abroad at present, and the flue gas after denitration adopts flue gas desulfur device to carry out desulfurization again.Such as arcola adopts SNCR denitration to add lime stone (lime) gypsum usually, and large coal-burning power plant adopts SCR denitration to add desulfurization by lime gypsum method usually.But this method also exists following significantly not enough:
(1) denitrification apparatus is arranged in boiler export, and after desulfurizer is arranged in deduster, two covering devices are completely independent, and construction cost is high, and operational mode is complicated;
(2) SNCR denitration efficiency is lower, can only be used for arcola, generally all will transform with low nitrogen burning in stove or boiler tail transformation combines; And SCR is generally arranged between economizer and air preheater, carry out denitration transformation to built boiler generally to need to transform economizer and air preheater, and SCR denitration becomes sulfur trioxide owing to making the oxidizing sulfur dioxide in flue gas, ammonium hydrogen sulfate is generated with denitrfying agent ammonia, be attached on upstream device, cause the serious consequences such as the decline of upstream device heat exchange area, burn into blocking.
(3) SNCR denitration technological requirement flue-gas temperature is at optimal reaction temperature window 850-1100 DEG C, temperature is too high or too lowly all can have a strong impact on denitration efficiency, SCR technological requirement flue-gas temperature is at 320-410 DEG C, catalyst meeting accelerated ageing when flue-gas temperature temperature is too high, and temperature lower than 300 DEG C time, then can produce side reaction.The rigors of flue-gas temperature is constrained to the development of SNCR and SCR technique, particularly to heavy polluter's steel industry agglomerates of sintered pellets denitrating flue gas, agglomerates of sintered pellets flue-gas temperature is lower, SNCR and SCR technique is all inapplicable, current each state all at research low-temperature denitration catalyst, but makes little progress.
(4) along with environmental requirement improves constantly, traditional SCR and wet desulphurization are difficult to the requirement reaching ultra-clean discharge;
Summary of the invention
The purpose of this utility model is the deficiency existed to overcome above-mentioned prior art, provides the device of a kind of new wet method cooperation-removal sulfur dioxide in flue gas and nitrogen oxide.The utility model adopts double-column in series, first flue gas is allowed to pass through desulfurizing tower, denitrating tower is entered again utilize desulfurizing agent scrubbing CO_2 in desulfurizing tower after, in denitrating tower, by denitrfying agent, oxidation of nitric oxide is become nitrogen dioxide, the water-soluble generation nitrite ion of nitrogen dioxide, add ammoniacal liquor or urea seeding decomposition in liquid phase again, generate N
2.
Wherein desulfurizing agent can select the alkaline absorbents such as lime stone, lime, magnesia or ammonia according to actual conditions.Its main chemical reactions following (making desulfurizing agent for lime stone):
(1) spray-absorption:
SO
2+H
2O→H
2SO
3
CaCO
3+H
2SO
3→CaSO
3+CO
2+H
2O
(2) forced oxidation:
CaSO
3+1/2O
2→CaSO
4
(3) crystallization:
CaSO
4+2H
2O→CaSO
4·2H
2O
Denitrfying agent is made up of catalyst, oxidant and stabilizing agent.Wherein catalyst weight percent is 1%-3%, and oxidant percentage by weight is 5%-25%, and stabilizing agent percentage by weight is 72%-94%.Described catalyst is alkali metal or alkaline-earth metal catalyst, and described oxidant is hydrogen peroxide, potassium permanganate or sodium chlorite NaClO
2deng strong oxidizer, described stabilizing agent is 5-((six hydrogen-2,4,6-trioxy--5-pyrimidine radicals) imino group)-2,4,6 (1H, 3H, the alkaline metal salt of 5H) pyrimidine trione mono-ammonium (also known as murexide), or ethylenediamine tetra-acetic acid (EDTA).Its main chemical reactions is as follows:
(1) be oxidized
1/2O
2+NO→NO
2
(2) dissolve
2NO
2+H
2O→HNO
3+HNO
2
3HNO
2→HNO
3+2NO+H
2O
4NO+3O
2+2H
2O＝4HNO
3
(3) decompose
NO+NO
2+CO(NH
2)
2→2H
2O+CO
2+2N
2
To achieve these goals, realize by the following technical solutions:
A kind of wet method removes the device of sulfur dioxide in flue gas and nitrogen oxide, comprise flue, denitrating tower, denitration circulating pump, denitrfying agent excavationg pump, gypsum dehydration system, denitrfying agent regenerative system between desulfurizing tower, desulfuration recycle pump, gypsum excavationg pump, tower, it is characterized in that:
Described desulfurizing tower is cylindrical-shaped tower, gas approach is provided with in the middle part of tower body, tower body top is provided with exhanst gas outlet, be positioned at exhanst gas outlet bottom be provided with mist separator of desulfurization at tower body inner top, it is desulfurization uptake zone between demister and gas approach, tower body inner bottom part is desulfurization slurry pond, establishes 1 block of porous plate in desulfurization uptake zone, establishes 1-5 layer spraying layer above porous plate; Be provided with desulfuration recycle pump outside desulfurizing tower, and the quantity of desulfuration recycle pump is consistent with the number of plies of spraying layer, every platform desulphurization circulating delivery side of pump is connected with one deck spraying layer respectively, and the import of every platform desulfuration recycle pump is connected respectively with at the bottom of the tower of desulfurizing tower; In desulfurization slurry pond, be provided with aeration tube, pass into air forced oxidation; The import of gypsum excavationg pump is connected with the gypsum outlet be provided with bottom desulfurization slurry pond, and gypsum is discharged delivery side of pump and is connected with gypsum dehydration system, and gypsum dehydration system adopts technique and the device of current existing general maturation.
The exhanst gas outlet of desulfurizing tower is connected by flue between tower with the gas approach of denitrating tower;
Described denitrating tower is cylindrical-shaped tower, gas approach is provided with in the middle part of denitration tower body, denitration tower body top is provided with exhanst gas outlet, denitration demister is arranged on denitration tower body inner top, and be positioned under exhanst gas outlet, be denitration uptake zone between denitration demister and gas approach, tower body inner bottom part is denitration grout pond, establishes 1-5 layer packing layer in denitration uptake zone; A liquid distribution trough is provided with above every layer of packing layer, denitrating tower is outside equipped with denitration circulating pump, denitration circulating pump adopts unit style: every platform desulphurization circulating delivery side of pump is connected with one deck liquid distribution trough respectively, or adopts piping-main scheme: a circulating-pump outlet is connected with the liquid distribution trough of 1-5 layer; The import of every platform denitration circulating pump is connected respectively with at the bottom of the tower of denitrating tower, and the denitrfying agent outlet that import and the denitrating tower bottom slurry pond of denitrfying agent excavationg pump are arranged is connected, and denitrfying agent is discharged delivery side of pump and is connected with denitrfying agent regenerative system.
Described desulfurizing tower adopts band porous plate spray column.
Described denitrating tower adopts packed tower, and the filler of packing layer adopts Pall ring dumped packing, corrugated plate regular packing or grid structured packing.
Described denitrfying agent regenerative system comprises regeneration tank, depositing reservoir, denitrfying agent return pump; The outlet of denitrfying agent excavationg pump is connected with regeneration tank, and the outlet that regeneration tank top is provided with is connected with depositing reservoir, and depositing reservoir upper clear supernate returns by the denitrfying agent arranged the liquid distribution trough that denitrating tower got to by pump.
Described regeneration tank is a cross section is the container of rectangle, and centre is separated by dividing plate, and the denitrfying agent of regeneration can cover dividing plate from regeneration tank side and overflow to opposite side, regeneration tank both sides top board is respectively arranged with an agitator.
Wet method removes the method for sulfur dioxide in flue gas and nitrogen oxide, it is characterized in that carrying out according to the following steps:
(1) first the flue gas, containing sulfur dioxide and nitrogen oxides pollution thing enters desulfurizing tower, and in desulfurizing tower, flue gas upwards carries out absorption process by porous plate and spraying layer; Flue gas, by spraying layer, carries out counter current contacting with the absorbing liquid of spray, mass transfer and absorption reaction occurs, the Cl in flue gas
-, F
-, SO
2the acid contaminant 90-99% of easy absorption is removed by spray liquid washing absorption, and dust 60%-80% is removed; Along with the washing of desulfurizing tower Inner eycle, doctor solution pH value declines gradually, and desulfurizing agent loses activity gradually, needs supplementary fresh desulfurizing agent to maintain in desulfurizing tower slurries PH between 5-6; Wash away most Cl
-, F
-, SO
2the acid contaminant of easy absorption and the flue gas of dust leave desulfurizing tower, enter denitrating tower by demister except after the drop of deentrainment;
(2), along with the continuous circulated sprinkling of desulfurization absorbing liquid in desulfurizing tower absorbs, the sulfur dioxide absorbed generates calcium sulfite and is forced to be oxidized to calcium sulfate in desulphurization tower slurry pool, when the crystal of calcium sulfate content in slurry pool reaches mass concentration 18-20%, be discharged to gypsum dehydration system by the gypsum excavationg pump be connected with desulphurization tower slurry pool and carry out separating and dehydrating process, gypsum dehydration system adopts technique and the device of current existing general maturation;
(3) after, flue gas enters denitrating tower, in denitrating tower, flue gas upwards carries out absorption process by absorbed layer, absorbed layer arranges 1-5 layer packing layer according to nitrogen oxides in effluent concentration, flue gas passes through absorbed layer, counter current contacting is carried out with the absorbing liquid of spray, there is mass transfer and absorption reaction, denitrfying agent absorption nitrogen oxides in effluent also accelerates nitrogen oxides, oxidation of nitric oxide is made to become nitrogen dioxide, the water-soluble generation nitrite ion of nitrogen dioxide, then with ammoniacal liquor in liquid phase or urea generation catalytic reduction, generate N
2, the flue gas removing nitrogen oxide enters air by tower top demister except meeting discharge standard after the drop of deentrainment.
(4), along with system cloud gray model, denitrating tower absorbing liquid pH value constantly reduces, when PH lower than 8 time, absorbing liquid absorbing NOx ability declines, and therefore needs to be taken out by absorbing liquid continuously to regenerate; First being discharged by denitrating tower absorbing liquid send regeneration tank regenerate, regenerates mainly supplemental oxidant and ammoniacal liquor or urea, and regeneration afterwards denitrfying agent solution returns denitrating tower and recycles.
The utility model has following good effect:
Wet method removes sulfur dioxide in flue gas and nitrogen oxide technology has no requirement to flue-gas temperature.Can normally run within the scope of 50-200 DEG C.This for current denitrating flue gas long-standing-heavy polluter's steel industry agglomerates of sintered pellets denitrating flue gas is very applicable, if this technology is widely promoted, thoroughly can solve the technical barrier of current agglomerates of sintered pellets denitrating flue gas.Also can solve the technical barrier of another heavy polluter-glass furnace road denitrating flue gas simultaneously, have great economic benefit and social benefit.
Wet method removes sulfur dioxide in flue gas and nitrogen oxide technology due to denitrfying agent also fabulous desulfidation, can thoroughly remove the sulfur dioxide of residual minim in desulfurizing tower exiting flue gas, this technology close to 100%, easily realizes the discharge of flue gas ultra-clean to sulfur dioxide in flue gas removal efficiency.
According to lab scale test, adopt technique of the present utility model, desulfurization off sulfide effect is remarkable, sees the following form:
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present utility model.
Detailed description of the invention
As shown in Figure 1, the utility model device used comprises flue 10, gypsum dehydration system, denitrating tower 11, denitrating tower circulating pump 17, denitrfying agent excavationg pump 18, denitrfying agent regenerative system between desulfurizing tower 1, desulfurizing tower circulating pump 8, gypsum excavationg pump 9, tower, described denitrfying agent regenerative system comprises regeneration tank 19, depositing reservoir 20, denitrfying agent return pump 22, desulfurizing tower 1 adopts band porous plate spray column, denitrating tower 11 adopts packed tower, and the filler of packing layer adopts structured packing;
Described desulfurizing tower is cylindrical-shaped tower; Gas approach 2 is provided with in the middle part of tower body, tower body top is provided with exhanst gas outlet 6, mist separator of desulfurization 5 is arranged on tower body inner top, and be positioned under exhanst gas outlet 6, it is desulfurization uptake zone between demister 5 and gas approach 2, tower body inner bottom part is desulfurization slurry pond, establishes 1 block of porous plate 3 in desulfurization uptake zone, establishes 3 layers of spraying layer 4 above porous plate; Be provided with 3 desulfuration recycle pumps 8 outside desulfurizing tower, the outlet of every platform desulfuration recycle pump 8 is connected with one deck spraying layer 4 respectively, and the import of desulfuration recycle pump 8 is connected respectively with at the bottom of the tower of desulfurizing tower 1; In desulfurization slurry pond, be provided with aeration tube 7, pass into air forced oxidation; The import of gypsum excavationg pump 9 is connected with the gypsum outlet be provided with bottom desulfurization slurry pond, and the outlet of gypsum excavationg pump 9 is connected with gypsum dehydration system; Gypsum dehydration system adopts technique and the device of current existing general maturation;
The exhanst gas outlet 6 of desulfurizing tower 1 is connected with the gas approach 12 of denitrating tower 11 by flue 10 between tower;
Described denitrating tower is columnar tower body, gas approach 12 is provided with in the middle part of denitration tower body, denitration tower body top is provided with exhanst gas outlet 16, denitration demister 15 is arranged on denitration tower body inner top, and be positioned under exhanst gas outlet 16, it is denitration uptake zone between denitration demister 15 and gas approach 12, tower body inner bottom part is denitration grout pond, 3 layers of packing layer 13 are established in denitration uptake zone, a liquid distribution trough 14 is provided with above every layer of packing layer 13, denitrating tower is outside equipped with denitration circulating pump 17, and the outlet of denitration circulating pump 17 is connected with liquid distribution trough 14; The import of denitration circulating pump 17 is connected with at the bottom of the tower of denitrating tower, the denitrfying agent outlet that import and the denitrating tower bottom slurry pond of denitrfying agent excavationg pump 18 are arranged is connected, the outlet of denitrfying agent excavationg pump 18 is connected with the regeneration tank 19 of denitrfying agent regenerative system, the outlet that regeneration tank 19 top is provided with is connected with depositing reservoir 20, and depositing reservoir 20 upper clear supernate returns by the denitrfying agent arranged the liquid distribution trough 14 that denitrating tower 11 got to by pump 22; Described regeneration tank 19 is cross sections is the container of rectangle, and centre is separated by dividing plate, and medium can cover dividing plate from regeneration tank side and overflow to opposite side, regeneration tank both sides top board is respectively arranged with an agitator 21.
As shown in Figure 1, first the flue gas containing the pollutant such as sulfur dioxide and nitrogen oxide enters desulfurizing tower 1, in desulfurizing tower 1, flue gas upwards carries out absorption process by porous plate 3 and spraying layer 4, the absorbing liquid of flue gas and spray carries out counter current contacting, mass transfer and absorption reaction occurs, the Cl in flue gas
-, F
-, SO
2removed by spray liquid washing absorption Deng the acid contaminant 90-99% easily absorbed, dust 60%-80% is removed; Along with the washing of desulfurizing tower 1 Inner eycle, doctor solution pH value declines gradually, and desulfurizing agent loses activity gradually, needs supplementary fresh desulfurizing agent to maintain in desulfurizing tower slurries PH between 5-6.Wash away most Cl
-, F
-, SO
2after easily the acid contaminant of absorption and the flue gas of dust remove the drop of deentrainment by desulfurizer mist eliminator 5, leave desulfurizing tower 1 from desulfurizing tower 1 top desulfurizing tower exhanst gas outlet 6, enter denitrating tower 11 by flue between tower 10;
Along with the continuous circulated sprinkling of desulfurization absorbing liquid in desulfurizing tower 1 absorbs, the sulfur dioxide absorbed generates calcium sulfite and is forced to be oxidized to calcium sulfate in desulphurization tower slurry pool, when the crystal of calcium sulfate content in slurry pool reaches finite concentration (18-20%), be discharged to gypsum dehydration system by the gypsum excavationg pump 9 be connected with desulphurization tower slurry pool and carry out separating and dehydrating process, gypsum dehydration system adopts technique and the device of current existing general maturation;
After the flue gas leaving desulfurizing tower 1 enters denitrating tower 11 from denitrating tower smoke inlet 12, in denitrating tower 11, flue gas upwards carries out absorption process by the packing layer 13 of denitrating tower, denitrating tower packing layer 13 arranges 1-5 layer packing layer according to nitrogen oxides in effluent concentration, flue gas is by denitrating tower packing layer 13, counter current contacting is carried out with the absorbing liquid uniform by liquid distribution trough 14, there is mass transfer and absorption reaction, denitrfying agent absorption nitrogen oxides in effluent also accelerates its oxidation, oxidation of nitric oxide is made to become nitrogen dioxide, the water-soluble generation nitrite ion of nitrogen dioxide, again with ammoniacal liquor in liquid phase or urea generation catalytic reduction, generate N2.The flue gas removing nitrogen oxide enters air by denitrating tower demister 15 except leaving denitrating tower 11 from denitrating tower 11 top denitrating tower exhanst gas outlet 16 after the drop of deentrainment.
Along with system cloud gray model, denitrating tower 11 absorbing liquid pH value constantly reduces, when PH lower than 8 time, absorbing liquid absorbing NOx ability declines, and therefore needs to be taken out by absorbing liquid continuously to regenerate.The denitrating tower absorbing liquid in denitrating tower 11 bottom slurry pond is discharged by denitrfying agent excavationg pump 18 and is sent regeneration tank 19 to regenerate, first oxidant is added in regeneration tank 19 side, and stirred by groove top agitator 21, the denitrfying agent adding oxidant covers dividing plate from regeneration tank side and overflows to opposite side, ammoniacal liquor or urea is added at opposite side, and stirred by groove top agitator 21, the denitrfying agent of regeneration flows to depositing reservoir 20 from regeneration tank 19 top discharge outlet, return pump 22 by denitrfying agent precipitate the impurity such as dust in depositing reservoir 20 after to return denitrating tower 11 and recycle.
Embodiment 1
As shown in Figure 1, the temperature from boiler is the flue gas of 135 DEG C, and flow is 560000 standard cubes m/h, and sulfur dioxide in flue gas concentration is 3600mg/Nm
3, nitrous oxides concentration 560mg/Nm
3, dust content is 50mg/Nm
3.This flue gas enters desulfurizing tower 1 from desulfurizing tower 1 smoke inlet 2, and in desulfurizing tower 1, flue gas upwards carries out absorption process by porous plate 3 and shower 4, shower 4 haves three layers altogether, and each interlayer is every 2 meters, and the absorbing liquid of flue gas and spray carries out counter current contacting, there is mass transfer and absorption reaction, the Cl in flue gas
-, F
-, SO
2removed by spray liquid washing absorption Deng the acid contaminant 90-99% easily absorbed, dust 60%-80% is removed; Along with the washing of desulfurizing tower 1 Inner eycle, doctor solution pH value declines gradually, and desulfurizing agent loses activity gradually, needs supplementary fresh desulfurizing agent to maintain in desulfurizing tower slurries PH between 5-6.Wash away most Cl
-, F
-, SO
2after easily the acid contaminant of absorption and the flue gas of dust remove the drop of deentrainment by desulfurizer mist eliminator 5, leave desulfurizing tower 1 from desulfurizing tower 1 top desulfurizing tower exhanst gas outlet 6, enter denitrating tower 11 by flue between tower 10;
Along with the continuous circulated sprinkling of desulfurization absorbing liquid in desulfurizing tower 1 absorbs, the sulfur dioxide absorbed generates calcium sulfite and is forced to be oxidized to calcium sulfate in desulphurization tower slurry pool, when the crystal of calcium sulfate content in slurry pool reaches finite concentration (18-20%), be discharged to gypsum dehydration system by the gypsum excavationg pump 9 be connected with desulphurization tower slurry pool and carry out separating and dehydrating process, gypsum dehydration system adopts technique and the device of current existing general maturation;
After the flue gas leaving desulfurizing tower 1 enters denitrating tower 11 from denitrating tower smoke inlet 12, in denitrating tower 11, flue gas upwards carries out absorption process by denitrating tower packing layer 13, and denitrating tower packing layer 13 arranges 4 layers altogether, adopts PP material corrugated plate regular packing.Flue gas is by denitrating tower packing layer 13, counter current contacting is carried out with the absorbing liquid uniform by liquid distribution trough 14, there is mass transfer and absorption reaction, denitrfying agent absorption nitrogen oxides in effluent also accelerates its oxidation, oxidation of nitric oxide is made to become nitrogen dioxide, the water-soluble generation nitrite ion of nitrogen dioxide, then with ammoniacal liquor in liquid phase or urea generation catalytic reduction, generate N2.The flue gas removing nitrogen oxide enters air by denitrating tower demister 15 except leaving denitrating tower 11 from denitrating tower 11 top denitrating tower exhanst gas outlet 16 after the drop of deentrainment.Sulfur dioxide concentration in the clean flue gas of discharging is 16mg/Nm
3, nitrous oxides concentration 72mg/Nm
3, dust content is 12mg/Nm
3, calculating desulfuration efficiency is 99.56%, and denitration efficiency is 87.14, and efficiency of dust collection is 76%.
Along with system cloud gray model, denitrating tower 11 absorbing liquid pH value constantly reduces, when PH lower than 8 time, absorbing liquid absorbing NOx ability declines, and therefore needs to be taken out by absorbing liquid continuously to regenerate.The denitrating tower absorbing liquid in denitrating tower 11 bottom slurry pond is discharged by denitrfying agent excavationg pump 18 and is sent regeneration tank 19 to regenerate, first add in regeneration tank 19 side the liquor potassic permanganate 20l/h that oxidant concentration is 10%, and stirred by groove top agitator 21, the denitrfying agent adding oxidant covers dividing plate from regeneration tank side and overflows to opposite side, adding concentration at opposite side is 20% ammoniacal liquor, addition 1m
3/ h, and being stirred by groove top agitator 21, the denitrfying agent of regeneration flows to depositing reservoir 20 from regeneration tank 19 top discharge outlet, returns pump 22 return denitrating tower 11 and recycle in depositing reservoir 20 after precipitating the impurity such as dust by denitrfying agent.
Embodiment 2
The flow process of embodiment 2 is identical with embodiment 1, and difference is flue gas is from steel works sintering machine, and temperature is 150 DEG C, and flue gas flow is 1.1 × 10
6standard cube m/h, sulfur dioxide in flue gas concentration is 1500mg/Nm
3, nitrous oxides concentration 380mg/Nm
3, dust content is 100mg/Nm
3; This flue gas enters desulfurizing tower 1 from desulfurizing tower 1 smoke inlet 2, and in desulfurizing tower 1, flue gas upwards carries out absorption process by porous plate 3 and shower 4, shower 4 has 2 layers, and each interlayer is every 2 meters, and the absorbing liquid of flue gas and spray carries out counter current contacting, there is mass transfer and absorption reaction, the Cl in flue gas
-, F
-, SO
2removed by spray liquid washing absorption Deng the acid contaminant 90-99% easily absorbed, dust 60%-80% is removed; Along with the washing of desulfurizing tower 1 Inner eycle, doctor solution pH value declines gradually, and desulfurizing agent loses activity gradually, needs supplementary fresh desulfurizing agent to maintain in desulfurizing tower slurries PH between 5-6.Wash away most Cl
-, F
-, SO
2after easily the acid contaminant of absorption and the flue gas of dust remove the drop of deentrainment by desulfurizer mist eliminator 5, leave desulfurizing tower 1 from desulfurizing tower 1 top desulfurizing tower exhanst gas outlet 6, enter denitrating tower 11 by flue between tower 10;
Along with the continuous circulated sprinkling of desulfurization absorbing liquid in desulfurizing tower 1 absorbs, the sulfur dioxide absorbed generates calcium sulfite and is forced to be oxidized to calcium sulfate in desulphurization tower slurry pool, when the crystal of calcium sulfate content in slurry pool reaches finite concentration (18-20%), be discharged to gypsum dehydration system by the gypsum excavationg pump 9 be connected with desulphurization tower slurry pool and carry out separating and dehydrating process, gypsum dehydration system adopts technique and the device of current existing general maturation;
After the flue gas leaving desulfurizing tower 1 enters denitrating tower 11 from denitrating tower smoke inlet 12, in denitrating tower 11, flue gas upwards carries out absorption process by denitrating tower packing layer 13, and denitrating tower packing layer 13 arranges 3 layers altogether, adopts PP material corrugated plate regular packing.Flue gas is by denitrating tower packing layer 13, counter current contacting is carried out with the absorbing liquid uniform by liquid distribution trough 14, there is mass transfer and absorption reaction, denitrfying agent absorption nitrogen oxides in effluent also accelerates its oxidation, oxidation of nitric oxide is made to become nitrogen dioxide, the water-soluble generation nitrite ion of nitrogen dioxide, then with ammoniacal liquor in liquid phase or urea generation catalytic reduction, generate N2.The flue gas removing nitrogen oxide enters air by denitrating tower demister 15 except leaving denitrating tower 11 from denitrating tower 11 top denitrating tower exhanst gas outlet 16 after the drop of deentrainment.Sulfur dioxide concentration in the clean flue gas of discharging is 11mg/Nm
3, nitrous oxides concentration 68mg/Nm
3, dust content is 20mg/Nm
3, calculating desulfuration efficiency is 99.27%, and denitration efficiency is 82.1%, and efficiency of dust collection is 80%.
Along with system cloud gray model, denitrating tower 11 absorbing liquid pH value constantly reduces, when PH lower than 8 time, absorbing liquid absorbing NOx ability declines, and therefore needs to be taken out by absorbing liquid continuously to regenerate.The denitrating tower absorbing liquid in denitrating tower 11 bottom slurry pond is discharged by denitrfying agent excavationg pump 18 and is sent regeneration tank 19 to regenerate, first add in regeneration tank 19 side the liquor potassic permanganate 40l/h that oxidant concentration is 10%, and stirred by groove top agitator 21, the denitrfying agent adding oxidant covers dividing plate from regeneration tank side and overflows to opposite side, adding concentration at opposite side is 20% ammoniacal liquor, addition 1.3m
3/ h, and being stirred by groove top agitator 21, the denitrfying agent of regeneration flows to depositing reservoir 20 from regeneration tank 19 top discharge outlet, returns pump 22 return denitrating tower 11 and recycle in depositing reservoir 20 after precipitating the impurity such as dust by denitrfying agent.
Claims (5)
1. a wet method removes the device of sulfur dioxide in flue gas and nitrogen oxide, comprise flue, denitrating tower, denitration circulating pump, denitrfying agent excavationg pump, gypsum dehydration system, denitrfying agent regenerative system between desulfurizing tower, desulfuration recycle pump, gypsum excavationg pump, tower, it is characterized in that:
Described desulfurizing tower is cylindrical-shaped tower; Gas approach is provided with in the middle part of tower body, tower body top is provided with exhanst gas outlet, be positioned at exhanst gas outlet bottom be provided with mist separator of desulfurization at tower body inner top, it is desulfurization uptake zone between demister and gas approach, tower body inner bottom part is desulfurization slurry pond, establish 1 block of porous plate in desulfurization uptake zone, above porous plate, establish 1-5 layer spraying layer; Be provided with desulfuration recycle pump outside desulfurizing tower, and the quantity of desulfuration recycle pump is consistent with the number of plies of spraying layer, every platform desulphurization circulating delivery side of pump is connected with one deck spraying layer respectively, and the import of every platform desulfuration recycle pump is connected respectively with at the bottom of the tower of desulfurizing tower; Aeration tube is provided with in desulfurization slurry pond; The import of gypsum excavationg pump is connected with the gypsum outlet be provided with bottom desulfurization slurry pond, and gypsum is discharged delivery side of pump and is connected with gypsum dehydration system;
The exhanst gas outlet of desulfurizing tower is connected by flue between tower with the gas approach of denitrating tower;
Described denitrating tower is cylindrical-shaped tower, gas approach is provided with in the middle part of denitration tower body, denitration tower body top is provided with exhanst gas outlet, denitration demister is arranged on denitration tower body inner top, and be positioned under exhanst gas outlet, it is denitration uptake zone between denitration demister and gas approach, tower body inner bottom part is denitration grout pond, 1-5 layer packing layer is provided with in denitration uptake zone, liquid distribution trough is provided with above every layer of packing layer, denitrating tower is outside equipped with denitration circulating pump, denitration circulating pump adopts unit style: every platform desulphurization circulating delivery side of pump is connected with one deck liquid distribution trough respectively, or employing piping-main scheme: a circulating-pump outlet is connected with the liquid distribution trough of 1-5 layer, the import of every platform denitration circulating pump is connected respectively with at the bottom of the tower of denitrating tower, and the denitrfying agent outlet that import and the denitrating tower bottom slurry pond of denitrfying agent excavationg pump are arranged is connected, and denitrfying agent is discharged delivery side of pump and is connected with denitrfying agent regenerative system.
2. wet method according to claim 1 removes the device of sulfur dioxide in flue gas and nitrogen oxide, it is characterized in that: described desulfurizing tower adopts the spray column of band porous plate.
3. wet method according to claim 1 removes the device of sulfur dioxide in flue gas and nitrogen oxide, it is characterized in that: described denitrating tower adopts packed tower, and the filler of packing layer adopts Pall ring dumped packing, corrugated plate regular packing or grid structured packing.
4. wet method according to claim 1 removes the device of sulfur dioxide in flue gas and nitrogen oxide, it is characterized in that: described denitrfying agent regenerative system comprises regeneration tank, depositing reservoir, denitrfying agent return pump; The outlet of denitrfying agent excavationg pump is connected with regeneration tank, and the outlet that regeneration tank top is provided with is connected with depositing reservoir, and depositing reservoir upper clear supernate returns by the denitrfying agent arranged the liquid distribution trough that denitrating tower got to by pump.
5. wet method according to claim 4 removes the device of sulfur dioxide in flue gas and nitrogen oxide, it is characterized in that: described regeneration tank is a cross section is the container of rectangle, centre is separated by dividing plate, medium can cover dividing plate from regeneration tank side and overflow to opposite side, regeneration tank both sides top board is respectively arranged with an agitator.
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