CN101732970A - Device and method for promoting fine particle matters to be removed in coal-burning wet flue gas desulfuration process - Google Patents
Device and method for promoting fine particle matters to be removed in coal-burning wet flue gas desulfuration process Download PDFInfo
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Abstract
The invention provides a device and a method for promoting fine particle matters to be removed by applying a steam phase-change principle, aiming at the character of high flue gas and water vapor content in a coal-burning WFGD process with a pre-washing tower. The device for promoting the fine particle matters to be removed in the coal-burning wet flue gas desulfuration process comprises the pre-washing tower, a steam phase-change chamber and a main desulfurizing tower; the steam phase-change chamber is provided with a waste liquor washing outlet, a flue gas inlet and a flue gas outlet; the flue gas inlet is connected with a flue gas outlet of the pre-washing tower; the flue gas outlet is connected with a flue gas inlet of the main desulfurizing tower; and a steam nozzle, a demister and a washing water nozzle are sequentially arranged between the flue gas inlet and the flue gas outlet of the steam phase-change chamber.
Description
One, technical field
The invention belongs to a kind of technology that promotes that fine particle removes in the coal combustion flue gas, the applying steam Transformation Principle promotes the device and method that fine particle removes in particularly a kind of coal-burning wet flue gas desulfuration process that is provided with prewashing column.
Two, background technology
Pellet (PM
10) particularly aerodynamic diameter is less than the fine particle (PM of 2.5 μ m
2.5) pollute and to have become the outstanding atmospheric environment problem of China, and cause the great attention of countries in the world day by day; Main cause is PM
2.5The fine particle specific area is big, easy each heavy metal species of enrichment and chemical carcinogen, and conventional dedusting technology is difficult to effective capture to it, causes a large amount of fine particles to enter atmospheric environment.Be difficult to capture PM as wet desulfuration tower (comprising demister, desulfurization cleaning solution)
2.5Fine particle, but can reach more than 70～80% for the particulate removal efficiency more than 3～5 μ m; Test 300MW coal-burning power plant wet process of FGD (WFGD) systems such as the Wang Hui of Tsing-Hua University find that to the effect that removes of fine particle the WFGD system is to PM
1074.5% removal efficiency is arranged, but PM
2.5Increase (" Proceedings of the CSEE " 2008 the 28th volumes) on the contrary.Fire coal is mainly once originating of fine particle, and in quite long from now on period, fine particle can not change as the basal conditions of the primary pollutant of China's atmosphere pollution.Therefore, the pollution of controlling coal-fired fine particle is the great demand of national energy-saving and emission-reduction strategy.The main path of technical development is removed after making fine particle grow up into larger particles by physics or chemical action, carrying out process optimization and use new reasonable know-why to improve the performance that removes to fine particle in conjunction with existing coal-fired flue-gas pollutant control appliance, is the important technology developing direction of control fine particle; Wherein, the steam phase transforming preconditioning technique being combined with existing coal-burning boiler wet process of FGD technology is most possibly to realize one of important channel that engineering is used.The mechanism that steam phase transforming impels fine particle to grow up is: in the supersaturated vapor environment, steam is that the nuclei of condensation undergo phase transition with the fine particle, grain graininess increase, quality are increased, and produce the effect of diffusiophoresis and thermophoresis simultaneously, impel the fine particle travel motion, collision contact mutually further impels the fine particle coalescence to grow up.For this reason, applying steam phase transformation preconditioning technology, at first should set up the supersaturated vapor environment, but simple dependence added steam to make original moisture content is low, the cigarette temperature is high coal-fired flue-gas reach the supersaturation energy consumption too high, and it is just with practical value to have only process higher with the flue gas moisture content, that the cigarette temperature is lower to combine.
At present, the coal-burning wet flue gas desulfuration technology is more and more ripe and universal, in part WFGD technology, at the preceding prewashing column of setting up of desulfuration absorbing tower (desulfurization king-tower), improves SO to play
2Absorptivity, dedusting and improve effects such as gypsum quality; During flue gas process prewashing column, high-temperature flue gas contacts with middle cold washing liquid phase, strong heat and mass transfer process takes place, high-temperature flue gas makes the vaporization of part cleaning solution, flue gas relative humidity increase and can near or the state that reaches capacity, the cigarette temperature is reduced to about 50～65 ℃ by 100～150 ℃, but still is the desulfurization king-tower at prewashing column no matter, does not all reach and realizes the required supersaturated vapor environment of steam phase transforming.Therefore, set up prewashing column and can only improve SO
2With the removal efficiency of meal dirt, still be difficult to capture fine particle.Simultaneously, the coal-burning power plant of WFGD system is installed, the fine particle that enters atmospheric environment also comprises the inorganic salts particulate that sulfuric acid mist, desulfurization form except that burned-coal fly ash; Holland Meij analyzes and finds, limestone/gypsum method desulphurization system outlet fine particle belongs to PM substantially
2.5, except that burned-coal fly ash, also contain component (FuelProcessing Technology, 2004,85 (6-7): 641-656) such as gypsum and unreacted lime stone.
Three, summary of the invention
Goal of the invention: the present invention is directed to the high characteristics of flue gas moisture content in the coal-fired WFGD technology that is provided with prewashing column, provide a kind of applying steam Transformation Principle to promote the device and method that fine particle removes.
Technical scheme: promote the device that fine particle removes in a kind of coal-burning wet flue gas desulfuration process, this device is made up of prewashing column, steam phase transforming chamber and desulfurization king-tower, described prewashing column is provided with discard solution discharge port, gas approach and exhanst gas outlet, is provided with pre-wash nozzle for liquid and prewashing column demister between gas approach and the exhanst gas outlet successively; Described desulfurization king-tower is provided with discard solution discharge port, gas approach and purification exhanst gas outlet, is provided with doctor solution nozzle and desulfurization king-tower demister between gas approach and the exhanst gas outlet successively; Described steam phase transforming chamber is provided with flushing waste outlet, gas approach and exhanst gas outlet, described gas approach is connected with the prewashing column exhanst gas outlet, exhanst gas outlet is connected with the gas approach of desulfurization king-tower, be provided with steam jet, demister and flushing water nozzle between the gas approach of steam phase transforming chamber and the exhanst gas outlet successively, the steam phase transforming chamber size is no less than steam with the time of staying of flue gas in the phase transformation chamber and determines the low-surface-energy material that liner is anti-corrosion at the condense required time 50～200ms that grows up of fine grained surface coring.
Promote the device that fine particle removes in a kind of coal-burning wet flue gas desulfuration process, this device is made up of prewashing column, steam phase transforming chamber and desulfurization king-tower, described steam phase transforming chamber is located in the prewashing column, prewashing column is provided with discard solution discharge port, gas approach and exhanst gas outlet, be provided with pre-wash nozzle for liquid, prewashing column demister and steam phase transforming chamber between gas approach and the exhanst gas outlet successively, described steam phase transforming chamber is provided with steam jet, demister and flushing water nozzle successively by the flow of flue gas direction; Described desulfurization king-tower is provided with discard solution discharge port, gas approach and purification exhanst gas outlet, is provided with doctor solution nozzle and desulfurization king-tower demister between gas approach and the exhanst gas outlet successively; The exhanst gas outlet of prewashing column is connected with the gas approach pipeline of desulfurization king-tower.
Promote the device that fine particle removes in the coal-burning wet flue gas desulfuration process, described prewashing column demister, desulfurization king-tower demister are baffle plate demister, Lamb wave line demister or eddy flow plate demister; Steam phase transforming chamber demister is Lamb wave line demister or mesh mist eliminator.
Anti-corrosion low-surface-energy material is polytetrafluoroethylene (PTFE), tetrafluoroethene vinyl ether co-polymer or PVF vinyl ether co-polymer coating.
Promote the method that fine particle removes in the coal-burning wet flue gas desulfuration process, removing step is: coal-fired flue-gas is saturated or approaching saturated by water vapour after cleaning dust in prewashing column, enter the steam phase transforming chamber after removing water smoke by the prewashing column demister then, inject an amount of steam, the steam addition increases to S=1.10～1.50 with flue gas degree of supersaturation S by S ≈ 1 and determines, set up the supersaturated vapor environment that the fine particle coalescence is grown up required, the fine particle that coalescence is grown up is partly removed by the demister that places steam phase transforming chamber smoke outlet; Flue gas enters the desulfurization king-tower after the steam phase transforming chamber removes the parts of fine particle, increase the flue gas degree of supersaturation by optimizing desulfurization king-tower import gas-liquid temperature difference, makes the fine particle generation secondary coalescence that does not remove grow up and removed by doctor solution and desulfurization king-tower demister.
Promote the method that fine particle removes in the coal-burning wet flue gas desulfuration process, described desulfurization king-tower import flue gas is saturated or the supersaturation flue gas, 50～65 ℃ of flue-gas temperatures, and 30～45 ℃ of import doctor solution temperature are than low 20～30 ℃ of input gas temperature.
Improve the method that fine particle removes in the flue gas desulfurization process of fire coal, described PM2.5 fine particle comprises the inorganic salts aerosol particles that coal fly ash, sulfuric acid droplet or desulphurization reaction form.
Beneficial effect: the applying steam Transformation Principle promotes that fine particle removes, at first should set up the supersaturated vapor environment, but it is too high that simple dependence interpolation steam makes the coal-fired flue-gas that original moisture content is low, the cigarette temperature is high (100～150 ℃ of original moisture content 5～8%, cigarette temperature) reach the supersaturation energy consumption, and it is just with practical value to have only process higher with the flue gas moisture content, that the cigarette temperature is lower to combine.In being provided with the coal-fired WFGD system of prewashing column, flue gas is after pre-wash, and is can be by water vapour saturated or near saturated, and the supersaturated vapor environment that the fine particle coalescence is grown up required can be set up as long as add small amount of steam in cigarette temperature drop to 50～65 ℃.The present invention makes full use of above-mentioned process characteristic, between prewashing column exhanst gas outlet and desulfurization king-tower gas approach, or prewashing column demister superjacent air space is set up the steam phase transforming chamber, inject the appropriate atmospheric saturated vapor, set up the supersaturated vapor environment, the fine particle coalescence is grown up, and remove the dust-laden drop that coalescence is grown up by steam phase transforming chamber demister, the fine particle of failing to remove is then by optimizing desulfurization king-tower import gas-liquid temperature difference to increase the flue gas degree of supersaturation, making fine particle that the secondary coalescence take place in the desulfurization king-tower grows up, and remove, and then realize efficiently removing of fine particle by doctor solution and the demister that is installed in the desulfurization king-tower.With interpolation vapor phase ratio in original coal-fired flue-gas, steam consumption quantity can significantly reduce, and not only can effectively remove burned-coal fly ash, also can remove the inorganic salts aerosol particles of sulfuric acid droplet, desulphurization reaction formation.Make the indoor wall of steam phase transforming or wall lining, coating with anti-corrosion low-surface-energy material, can promote steam to suppress it in the fine particle surface condensation on the one hand condenses at steam phase transforming locular wall face, and then promote the phase transformation effect, also can solve the etching problem that causes because of the acid contaminant dewfall simultaneously.Technology of the present invention is simple, as long as existing coal-burning wet flue gas desulfuration device is improved, between prewashing column exhanst gas outlet and desulfurization king-tower gas approach or at prewashing column demister superjacent air space, set up the steam phase transforming chamber, add an amount of steam and be aided with suitable optimization desulfurization king-tower import gas-liquid temperature difference, can make existing coal-fired WFGD device have the effect that promotes that simultaneously the fine particle coalescence is grown up and efficiently removed, can be widely used in being provided with coal-burning power plant's wet flue gas desulfurizer of prewashing column.
Four, description of drawings
Fig. 1 is a process FB(flow block) of the present invention;
Fig. 2 is the apparatus structure schematic diagram of the embodiment of the invention 1;
Fig. 3 is the apparatus structure schematic diagram of the embodiment of the invention 2.
Among the figure: the 1-prewashing column; 2-pre-wash nozzle for liquid; 3-prewashing column demister; 4-steam phase transforming chamber; The 5-steam jet; 6-steam phase transforming chamber demister; 7-flushing water nozzle; 8-desulfurization king-tower; 9-desulfurization king-tower demister; 10-doctor solution nozzle; The 11-circulating pump; The A flue gas; B pre-wash liquid; C steam; The D flushing waste; The E flushing water; F purifies flue gas; The G doctor solution; The H discharging of waste liquid;
Five, the specific embodiment
Below in conjunction with Fig. 1～3, the present invention is elaborated:
Embodiment 1:
According to the present invention, promote method such as Fig. 1 that fine particle removes in a kind of coal-burning wet flue gas desulfuration process, shown in Figure 2: the high temperature coal flue gas enters prewashing column 1, after cleaning solution contacts, the cigarette temperature is reduced to 50～65 ℃ by 100～150 ℃, saturated or approaching saturated by water vapour, and remove coarse granule in the flue gas, after removing water smoke, prewashing column demister 3 enters steam phase transforming chamber 4 then, inject the appropriate atmospheric saturated vapor through steam jet 5, make flue gas reach the supersaturation attitude, supersaturated vapor is that the nuclei of condensation condense in the surperficial generation of fine particle coring with the fine particle, and produce diffusiophoresis and thermophoresis effect simultaneously, the fine particle granularity is increased, quality increases, and the dust-laden drop that coalescence is grown up is removed by the efficient demister 6 that places steam phase transforming chamber 4 smoke outlets, removes about 50～60% fine particle.The steam addition increases to S=1.10～1.50 with flue gas degree of supersaturation S by S ≈ 1 and determines, to guarantee that particle diameter after the fine grained coalescence is grown up is more than 3～5 μ m, suppress the homogeneous NUCLEATION PHENOMENA simultaneously, making steam phase transforming chamber 4 interior mainly generations with the fine particle is the process of heterogeneous nucleation of the nuclei of condensation.The indoor demister flushing water nozzle 7 that is provided with of steam phase transforming regularly to the demister flushing, causes resistance significantly to increase to prevent that demister from stopping up, and the fine particle that is captured is discharged with the flushing water waste liquid.Remove supersaturation flue gas (S 〉=1.0 of parts of fine particle through steam phase transforming chamber 4, temperature: 50～65 ℃) enters in the tower by desulfurization king-tower 8 bottom gas approach, with through circulating pump 11, the middle low-temp desulfurization liquid counter current contacting of doctor solution nozzle 10 ejections, import doctor solution temperature is controlled at 30～45 ℃, than low 20～30 ℃ of import cigarette temperature, cooled off by humidification in saturated flue gas and the doctor solution counter current contacting process, degree of supersaturation further increases, the fine particle generation secondary coalescence that does not remove is grown up, the dust-laden drop that coalescence is grown up is removed by doctor solution and demister 9 secondaries that are installed in the desulfurization king-tower, two times number concentration removal efficiency is 50～60%, and total concentration removal efficiency is more than 80%.The fine particle that removes also comprises the inorganic salts particulate that sulfuric acid droplet, desulfurization form except that burned-coal fly ash.Purifying flue gas discharges from desulfurization king-tower cat head exhanst gas outlet.
As shown in Figure 2, promote the device that fine particle removes in a kind of coal-burning wet flue gas desulfuration process of the present invention, mainly formed by prewashing column 1, steam phase transforming chamber 4, desulfurization king-tower 8.Steam phase transforming chamber 4 is located between prewashing column 1 exhanst gas outlet and desulfurization king-tower 8 gas approach, steam phase transforming is indoor to be provided with steam jet 5, demister 6 and demister flushing water nozzle 7 successively by the flow of flue gas direction, the internal layer lining is with anti-corrosion low-surface-energy material, as polytetrafluoroethylene (PTFE), tetrafluoroethene vinyl ether co-polymer, PVF vinyl ether co-polymer coating etc.; Steam phase transforming chamber 4 sizes (volume) are condensed in the coring of fine grained surface greater than steam with the time of staying of flue gas in the phase transformation chamber and are grown up that (about 50～200ms) determine required time.Prewashing column 1, desulfurization king-tower 8 and steam phase transforming chamber 4 smoke outlets are all installed demister, prewashing column demister 3, desulfurization king-tower demister 9 are selected the lower resistance demister for use, as baffle plate demister, Lamb wave line demister, eddy flow plate demister, steam phase transforming chamber demister 6 is selected efficient demister for use, as Lamb wave line demister, mesh mist eliminator.
Embodiment 2:
As shown in Figure 3, as different from Example 1, between prewashing column exhanst gas outlet and desulfurization king-tower gas approach, the steam phase transforming chamber is not set specially, but suitably increase prewashing column 1 height, do steam phase transforming chamber 4 with prewashing column demister 3 superjacent air spaces, and inject an amount of steam, the top of tower smoke outlet is provided with efficient demister 5 and demister flushing water nozzle 7, flue gas enters the desulfurization king-tower through pre-wash with after removing the parts of fine particle, and all the other are with embodiment 1.
Embodiment 3:
Promote the method that fine particle removes in a kind of coal-burning wet flue gas desulfuration process, step is: once remove fine particle: coal-fired flue-gas is after the pre-wash dedusting, saturated or approaching saturated by water vapour, enter the steam phase transforming chamber after removing water smoke, the time of staying 〉=50～200 of flue gas in the steam phase transforming chamber millisecond, inject the normal pressure saturated vapor, set up the supersaturated vapor environment that the fine particle coalescence is grown up required, the fine particle that coalescence is grown up is partly removed by the efficient demister that places steam phase transforming chamber exhanst gas outlet, and one time number concentration removal efficiency is 50～60%; Secondary removes fine particle: the supersaturation flue gas enters the desulfurization king-tower after the steam phase transforming chamber removes the parts of fine particle, with middle low-temp desulfurization liquid counter current contacting, optimize desulfurization king-tower import gas-liquid temperature difference and increase the flue gas degree of supersaturation, the fine particle generation secondary coalescence that does not remove is grown up and be desulfurized liquid and be installed on the interior demister of desulfurization king-tower and remove, two times number concentration removal efficiency is 50～60%, and total concentration removal efficiency is more than 80%.
Promote the device that fine particle removes in a kind of coal-burning wet flue gas desulfuration process, formed by prewashing column, steam phase transforming chamber, desulfurization king-tower.The steam phase transforming chamber is located between prewashing column exhanst gas outlet and the desulfurization king-tower gas approach, also can suitably increase the prewashing column height, do the steam phase transforming chamber with prewashing column demister superjacent air space, indoor steam jet, demister and the demister flushing water nozzle of being provided with of steam phase transforming; The steam phase transforming chamber size condenses in the coring of fine grained surface greater than steam with the time of staying of flue gas in the phase transformation chamber and grows up that (about 50～200ms) determine required time, liner has the low-surface-energy material of promoting phase transformation effect and anticorrosion double effects, as polytetrafluoroethylene (PTFE), tetrafluoroethene vinyl ether co-polymer, PVF vinyl ether co-polymer coating etc.Prewashing column, steam phase transforming chamber and desulfurization king-tower smoke outlet are installed demister, prewashing column and desulfurization king-tower demister are selected the lower resistance demister for use, as baffle plate demister, Lamb wave line demister, eddy flow plate demister, steam phase transforming chamber demister is selected efficient demister for use, as Lamb wave line demister, mesh mist eliminator.
Embodiment 4:
Flue gas is produced by fully-automatic coal-fired boiler, and exhaust gas volumn is 100Nm
3/ h, prewashing column tower diameter 150mm, high 2000mm, built-in three grades of sprays, the desulfurization king-tower is the rotating stream tray scrubber of tower diameter 150mm, tower height 2500mm, built-in 4 blocks of eddy flow plates, the wet desulphurization technology is two alkaline process, and the steam phase transforming chamber places the prewashing column smoke outlet, and prewashing column and steam phase transforming chamber smoke outlet are installed Lamb wave plate demister, mesh mist eliminator respectively.The ash-laden gas that coal-burning boiler produces enters prewashing column, 143 ℃ of tower import cigarette temperature, liquid-gas ratio 10L/Nm
3, after cleaning dust and removing water smoke, cigarette temperature drop to 59 ℃, flue gas relative humidity 93%; Enter the steam phase transforming chamber then, every Nm
3Flue gas injects 0.070kg steam, the indoor flue gas degree of supersaturation of phase transformation S ≈ 1.35.The supersaturation flue gas (S ≈ 1.16,60 ℃ of temperature) that removes the parts of fine particle through the steam phase transforming chamber is entered in the tower 38 ℃ of doctor solution temperature, liquid-gas ratio 3L/Nm by desulfurization king-tower bottom gas approach
3Claim the on-line testing of low pressure impactor through electricity, it is 55% that the fine particle in steam phase transforming chamber is counted the concentration removal efficiency, and it is 58% that desulfurization king-tower secondary fine particle is counted the concentration removal efficiency, and fine particle is counted the total removal efficiency of concentration and reached 81%.
Embodiment 5:
The steam phase transforming chamber places prewashing column demister superjacent air space, prewashing column tower diameter 150mm, and total tower height 3000mm, pre-wash district, steam phase transforming district height are respectively 2000mm, 1000mm, and all the other are substantially with embodiment 4; Claim the on-line testing of low pressure impactor through electricity, it is 80% that fine particle is counted the total removal efficiency of concentration.
Comparative Examples 1:
Adopt embodiment 4 pilot systems, but steam phase transforming chamber smoke outlet is not installed mesh mist eliminator, does not inject steam yet, 57 ℃ of desulfurization king-tower import cigarette temperature, relative humidity 94%, all the other are substantially with embodiment 4; Claim the on-line testing of low pressure impactor through electricity, it is 26% that fine particle is counted the total removal efficiency of concentration.
Claims (7)
1. promote the device that fine particle removes in a coal-burning wet flue gas desulfuration process, it is characterized in that this device is made up of prewashing column (1), steam phase transforming chamber (4) and desulfurization king-tower (8), described prewashing column is provided with discard solution discharge port, gas approach and exhanst gas outlet, is provided with pre-wash nozzle for liquid (2) and prewashing column demister (3) between gas approach and the exhanst gas outlet successively; Described desulfurization king-tower (8) is provided with discard solution discharge port, gas approach and purification exhanst gas outlet, is provided with doctor solution nozzle (10) and desulfurization king-tower demister (9) between gas approach and the exhanst gas outlet successively; Described steam phase transforming chamber (4) is provided with flushing waste outlet, gas approach and exhanst gas outlet, described gas approach is connected with prewashing column (1) exhanst gas outlet, exhanst gas outlet is connected with the gas approach of desulfurization king-tower, be provided with steam jet (5), demister (6) and flushing water nozzle (7) between the gas approach of steam phase transforming chamber (4) and the exhanst gas outlet successively, steam phase transforming chamber (4) size is no less than steam with the time of staying of flue gas in the phase transformation chamber and determines the anti-corrosion low-surface-energy material of liner at the condense required time 50～200ms that grows up of fine grained surface coring.
2. promote the device that fine particle removes in a coal-burning wet flue gas desulfuration process, it is characterized in that this device is by prewashing column (1), steam phase transforming chamber (4) and desulfurization king-tower (8) are formed, described steam phase transforming chamber (4) is located in the prewashing column (1), prewashing column is provided with discard solution discharge port, gas approach and exhanst gas outlet, be provided with pre-wash nozzle for liquid (2) between gas approach and the exhanst gas outlet successively, prewashing column demister (3) and steam phase transforming chamber (4), described steam phase transforming chamber (4) is provided with steam jet (5) successively by the flow of flue gas direction, demister (6) and flushing water nozzle (7); Described desulfurization king-tower (8) is provided with discard solution discharge port, gas approach and purification exhanst gas outlet, is provided with doctor solution nozzle (10) and desulfurization king-tower demister (9) between gas approach and the exhanst gas outlet successively; The exhanst gas outlet of prewashing column is connected with the gas approach pipeline of desulfurization king-tower; Steam phase transforming chamber (4) size is no less than steam with the time of staying of flue gas in the phase transformation chamber and determines the anti-corrosion low-surface-energy material of liner at the condense required time 50～200ms that grows up of fine grained surface coring.。
3. promote the device that fine particle removes in the coal-burning wet flue gas desulfuration process according to claim 1 and 2, it is characterized in that prewashing column demister (3), desulfurization king-tower demister (10) are baffle plate demister, Lamb wave line demister or eddy flow plate demister; Steam phase transforming chamber demister (6) is Lamb wave line demister or mesh mist eliminator.
4. promote the device that fine particle removes in the coal-burning wet flue gas desulfuration process according to claim 1 and 2, it is characterized in that anti-corrosion low-surface-energy material is polytetrafluoroethylene (PTFE), tetrafluoroethene vinyl ether co-polymer or PVF vinyl ether co-polymer coating.
5. promote the method that fine particle removes in the coal-burning wet flue gas desulfuration process, it is characterized in that removing step is: coal-fired flue-gas is saturated or approaching saturated by water vapour after cleaning dust in prewashing column, enter the steam phase transforming chamber after removing water smoke by the prewashing column demister then, inject an amount of steam, the steam addition increases to S=1.10～1.50 with flue gas degree of supersaturation S by S ≈ 1 and determines, set up the supersaturated vapor environment that the fine particle coalescence is grown up required, the fine particle that coalescence is grown up is partly removed by the demister that places steam phase transforming chamber smoke outlet; Flue gas enters the desulfurization king-tower after the steam phase transforming chamber removes the parts of fine particle, increase the flue gas degree of supersaturation by optimizing desulfurization king-tower import gas-liquid temperature difference, makes the fine particle generation secondary coalescence that does not remove grow up and removed by doctor solution and desulfurization king-tower demister.
6. promote the method that fine particle removes in the coal-burning wet flue gas desulfuration process according to claim 5, it is characterized in that described desulfurization king-tower import flue gas is saturated or the supersaturation flue gas, 50～65 ℃ of flue-gas temperatures, 30～45 ℃ of import doctor solution temperature are than low 20～30 ℃ of input gas temperature.
7. improve the method that fine particle removes in the coal-burning wet flue gas desulfuration process according to claim 6, it is characterized in that described PM
2.5Fine particle comprises the inorganic salts aerosol particles that coal fly ash, sulfuric acid droplet or desulphurization reaction form.
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2010
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