CN102908869B - Multi-layer type purifying absorption column for active coke smoke - Google Patents
Multi-layer type purifying absorption column for active coke smoke Download PDFInfo
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- CN102908869B CN102908869B CN201210409087.9A CN201210409087A CN102908869B CN 102908869 B CN102908869 B CN 102908869B CN 201210409087 A CN201210409087 A CN 201210409087A CN 102908869 B CN102908869 B CN 102908869B
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Abstract
The invention provides a multi-layer type purifying absorption column for active coke smoke. The multi-layer type purifying absorption column for the active coke smoke comprises a material inlet bin, distribution bins, absorption chamber bodies and unloading bins, which are communicated from top to bottom; the material inlet bin is positioned at the top of the absorption column; the two groups of absorption chamber bodies are positioned on two sides of the middle part of the absorption column; two distribution bins are positioned between the material inlet bin and the corresponding absorption chamber body; and the unloading bins are positioned at the bottom of the absorption chamber bodies. With the adoption of the multi-layer type active coke smoke purifying absorption column, high removal efficiency of pollutant is achieved, the removal efficiency of SO2 is more than 96%, the removal efficiencies of SO3, HCl and HF are more than 98%, the removal efficiency of heavy metal Hg is more than 90%, and the dust removal efficiency is more than 80%.
Description
Technical field
The present invention relates to flue gas pollutant purification apparatus, be specifically related to a kind of multiple field activated coke gas cleaning adsorption tower.
Background technology
In coal fired power plant flue gas desulfurization field, current more than 90% adopt be all lime stone-gypsum wet flue gas desulfurizing technique, although this technique technology maturation, be widely used, but its shortcoming also displays gradually in application process: 1) water consumption is high: for the flue gas in power station boiler desulfurizer not establishing flue gas heat-exchange unit GGH, amount to the water consumption of every gigawatt unit up to 220 ~ 250m
3/ h; 2) chimney anticorrosion and " gypsum rain " problem: the exiting flue gas of wet desulphurization device is saturated wet flue gas, must carry out high-grade anticorrosion, also may occur chimney " gypsum rain " problem, cause secondary pollution to surrounding enviroment chimney; 3) neat stress drop carries problem: the drop carried in neat stress is the gypsum slurries of about 20% concentration, wherein containing certain solid particle, enters in air and is dust pollution; 4) lime stone is exploited in a large number and is piled up problem with gypsum: owing to extensively adopting lime stone-gypsum wet flue gas desulfurizing technique, cause large quantities of lime tor to be exploited, also cause the desulfurated plaster of some areas to pile up.
According to China coal electricity development plan, future will focus the consruction on large-scale coal-electricity base, and the rich coal area of China is mainly positioned at the north, also water-deficient area just.Activated coke dry FGD process technique water consumption is little, and comparatively conventional wet desulfurization water saving more than 90%, and adsorbent activity Jiao produced by coal, and accessory substance is that concentrated sulfuric acid resourcebility utilizes, and large quantities of lime stone can not be caused to exploit and gypsum accumulation problem.In addition, in environmental protection key area, environmental carrying capacity is little, and environmental protection standard is strict, and activated coke flue gas purifying technique can to SO
2, SO
3, NOx, HCl, HF, Hg, fine solid particle etc. efficient removal carry out while, and there is no " gypsum rain " of conventional wet desulfurization, the problem such as neat stress drop carries, very strict environmental protection standard can be met, be applicable to the gas cleaning of environmentally sensitive area.
In addition, for the purified treatment of steel sintering flue gas, flue gas of refuse burning, activated coke can adsorb wherein bioxin pollutant simultaneously, and traditional wet desulfurizing process cannot effectively remove by Dui bioxin.Therefore, activated coke is applicable to the multi-pollutant removing in sinter fume and flue gas of refuse burning and deep purifying.
Activated coke flue gas purifying technique is a kind of efficient, water saving, non-secondary pollution simultaneously remove the advanced technologies of multiple pollutant, but this technique is just in the starting stage in the application of China, in open source information, lack the further investigation of nucleus equipment to activated coke flue gas purifying technique and key parameter.
Summary of the invention
The object of the present invention is to provide a kind of pollutant removing efficiency high, SR is little, and unsaturated activated coke discharge rate is little, activated coke internal circulating load is less, breakage rate is low, and activated coke cloth is even, discharging is smooth and easy, the multiple field activated coke gas cleaning adsorption tower that plant running is stable.
For achieving the above object, the technical solution used in the present invention is: comprise the feeding warehouse be connected from top to bottom, distribution bin, absorption cavity and discharge bin, described feeding warehouse is positioned at adsorption tower top, two groups of adsorbent chamber bodies are positioned at two side positions in the middle of adsorption tower, two distribution bin are between corresponding feeding warehouse and absorption cavity, discharge bin is positioned at the bottom of absorption cavity, described often group absorption cavity is made up of some layers of adsorption layer, the bottom of each layer adsorption layer is all provided with a frequency conversion type major axis discharger, the length of this frequency conversion type major axis discharger runs through whole absorption cavity.
The thickness D of described often group absorption cavity is 1.5 ~ 3.0m, and the height H of described absorption cavity is 16 ~ 30m.
Be provided with inlet valve between described feeding warehouse and distribution bin, discharge bin outlet is provided with discharge valve.
The inclination alpha of any point on the wall of described distribution bin and the feeding warehouse line of centres is greater than 40 °.
The angle of inclination beta of any point on the wall of described discharge bin and the discharge port line of centres is greater than 45 °.
Flue gas divides two strands perpendicular through two groups of absorption cavitys, and flue gas is 0.2 ~ 0.6m/s by the flow velocity of absorption cavity void tower.
The void tower time of staying of described flue gas in absorption cavity is 5 ~ 10s.
Adopt multiple field activated coke gas cleaning adsorption tower of the present invention, pollutant removing efficiency is high, SO
2removal efficiency is greater than 96%, SO
3, HCl, HF removal efficiency be greater than 98%, the removal efficiency of heavy metal Hg is greater than 90%, and efficiency of dust collection is greater than 80%.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention;
Fig. 2 is the side view of Fig. 1;
Fig. 3 is the schematic diagram at distribution bin 3 wall inclination angle;
Fig. 4 is the schematic diagram at discharge bin 6 wall inclination angle.
In accompanying drawing, the parts representated by each label are as follows:
1 is feeding warehouse; 2 is inlet valve; 3 is distribution bin; 4 is absorption cavity; 5 is major axis discharger; 6 is discharge bin, and 7 is discharge valve.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
See Fig. 1, 2, the present invention includes the feeding warehouse 1 be connected from top to bottom, distribution bin 3, absorption cavity 4 and discharge bin 6, described feeding warehouse 1 is positioned at adsorption tower top, absorption cavity 4 is positioned at two side positions in the middle of adsorption tower, two distribution bin 3 are adsorbed between cavity 4 at feeding warehouse 1 with corresponding, discharge bin 6 is positioned at the bottom of absorption cavity 4, inlet valve 2 is installed between feeding warehouse 1 and distribution bin 3, discharge bin 6 outlet is provided with discharge valve 7, often group absorption cavity 4 is made up of some layers of adsorption layer, the bottom of each layer adsorption layer is all provided with a frequency conversion type major axis discharger 5, the length of this frequency conversion type major axis discharger 5 runs through whole absorption cavity 4, often the thickness D of group absorption cavity 4 is 1.5 ~ 3.0m, the height H of absorption cavity 4 is 16 ~ 30m, flue gas of the present invention divides two strands perpendicular through two groups of absorption cavitys 4, and flue gas is 0.2 ~ 0.6m/s by the flow velocity of absorption cavity void tower, the time of staying is 5 ~ 10s.
The present invention adopts the multi layer control time of staying of activated coke in adsorption tower, and in the present embodiment, the time of staying of ground floor activated coke in tower is 20 ~ 40h, and the second layer is 60 ~ 120h, and third layer is 140 ~ 280h.In every layer of activated coke, activated coke uniform blanking.When inlet flue gas pollutant levels change, discharge quantity can be regulated by changing major axis discharger 5 rotating speed.
The present invention is under the condition that every adsorption tower smoke treatment amount is certain, flue gas is determined by windward side area by the flow velocity of absorption cavity 4 void tower, its area is the absorption width W of cavity 4 and the product of height H, in the present embodiment, the width W of absorption cavity 4 is 9m, height H is 18m, and flue gas is 0.284m/s by adsorbing the void tower flue gas flow rate of cavity 4.The void tower time of staying of flue gas in absorption cavity is determined by the thickness D and void tower flue gas flow rate adsorbing cavity 4, and in the present embodiment, the thickness D of absorption cavity 4 is 2m, and the void tower time of staying of flue gas in absorption cavity 4 is 7.04s.Flue gas is closely related with the thickness D and void tower flue gas flow rate adsorbing cavity 4 by the resistance of the active focus layer in activated coke absorption cavity 4, and in the present embodiment, flue gas is about 1900Pa by the resistance of the active focus layer in activated coke cavity 4.
See Fig. 3, in the present embodiment, distribution bin 3 is cone structure, facies basialis pyramidis is the rectangle of 2m × 9m, cone height 4.5m, and on distribution bin 3 wall, the inclination alpha of the line at any point and charging aperture center is 44 ° ~ 77 °, activated coke can cover whole bottom surface in distribution bin 3, fill whole distribution bin space, chamber of not leaving a blank, activated coke cloth in distribution bin 3 is even.
See Fig. 4, in the present embodiment, discharge bin 6 is the cone structure stood upside down, and facies basialis pyramidis is the rectangle of 5.5m × 9m, cone height 5m, and on discharge bin 6 wall, the angle of inclination beta of the line at any point and discharge port center is between 46 ° ~ 63 °, and activated coke discharging is smooth and easy.
The boiler exhaust gas of certain coal-burning power plant is after SCR denitration and electrostatic precipitation process, and its Gas Parameters is as follows:
Exhaust gas volumn: 2760000Nm
3/ h(marks state, wet basis, actual O
2)
Flue-gas temperature: 140 DEG C
In flue gas, pollutant levels are as following table:
2 air-introduced machine correspondence configuration 2 row activated coke adsorption towers of every platform boiler, often arrange and composed in parallel by 6 adsorption towers, the exhaust gas volumn of every platform adsorption tower process is 230000Nm
3about/h.
In the present embodiment, point two bursts of three layers of activated coke passed perpendicularly through in absorption cavity 4 after flue gas enters adsorption tower, in the process, the pollutant in flue gas is by activated coke adsorbing and removing.Fresh activity Jiao is stored in feeding warehouse 1, distribution bin 3 is entered into by the control of inlet valve 2, distribution bin 3 is connected with absorption cavity 4, activated coke in absorption cavity 4 is divided into multilayer vertically movement from top to bottom, and the time of staying of each layer activated coke in adsorption tower is controlled by the major axis discharger 5 of bottom.Adsorb saturated activated coke and enter into discharge bin 6, control to discharge by discharge valve 7, then enter into desorption system and regenerate, the feeding warehouse 1 that the activated coke after regeneration enters into again adsorption tower top recycles.
In the present embodiment, the exit concentration of each pollutant and removal efficiency are as following table:
In the present embodiment, pollutant removing efficiency is high, and SR is less, and discharge rate and the internal circulating load of activated coke are less, and activated coke breakage rate is low, and activated coke cloth is even, discharging is smooth and easy, and activated coke gas cleaning adsorption tower is efficient, stable, economical operation.
Its beneficial effect of the present invention is adopted to be mainly reflected in following six aspects:
One, adopt suitable flue gas flow rate, control rational gas residence time, pollutant removing efficiency is high, SO
2removal efficiency is greater than 96%, SO
3, HCl, HF removal efficiency be greater than 98%, the removal efficiency of heavy metal Hg is greater than 90%, and efficiency of dust collection is greater than 80%.
Its two, adopt suitable flue gas flow rate and adsorbent chamber body thickness, SR is little, and flue gas is less than 2500Pa by the resistance of adsorbent chamber activity in vivo focus layer.
Its three, adopt rational adsorbent chamber height, under ensureing that activated coke crushes the few condition of breakage, reduce adsorption tower and take up an area.
They are four years old, absorption cavity is divided into multilayer, a frequency conversion type major axis discharger is set bottom each layer, the each time of staying of layer activated coke in tower can be controlled respectively according to the kind of institute's adsorption fouling thing and concentration, the discharge quantity of major axis discharger can also be regulated according to the change of pollutant levels, the discharge rate of accurate hierarchical control activated coke, reduces the discharge rate of unsaturation activated coke, the breakage reducing the energy consumption needed for desorption and regeneration and reduce in activated coke cyclic process; And the length of major axis discharger is through the whole width of absorption cavity, for the activated coke that in absorption cavity, translational speed is slow, mobility is poor, its uniform blanking can be made, make all smooth and easy discharges of energy of saturated activated coke, prevent local blanking from freely not occurring adsorption efficiency difference and gathering the danger producing high temperature and catch fire.
Its five, the inclination angle of the line at any point on distribution bin wall and charging aperture center is greater than the angle of repose that activated coke is piled up, and ensures that activated coke covers the whole end face of absorption cavity, and ensure that in distribution bin, cloth is even, each layer activated coke all can effectively be supplemented; Also avoid activated coke and form cavity in distribution bin, flue gas is escaped from cavity and can not get purified treatment.
Its six, in discharge bin, the inclination angle of the line at any point and discharge port center is greater than the slide angle of activated coke, ensure that the discharging of activated coke is smooth and easy, is detained or causes blocking in the discharge bin avoiding activated coke.
Adsorbent chamber body thickness of the present invention is the optimum value considering pollutant removing efficiency and flue gas resistance, and adopt adsorbent chamber body thickness of the present invention, pollutant removing efficiency is high, and flue gas is moderate by the resistance of active focus layer.If adsorbent chamber body thickness is too small, pollutant desulfuration efficiency can not meet environmental requirement; If adsorbent chamber body thickness is excessive, then flue gas resistance is large, and system energy consumption is high.
Adsorbent chamber height of the present invention is the most reasonable value considering that activated coke anti-pressure ability and adsorption tower take up an area.If activated coke housing depth is excessive, activated coke is easily crushed, adds the loss of activated coke; If activated coke housing depth is too small, under certain flue gas flow rate, then need increase the width of absorption cavity or increase the quantity of adsorption tower, the equipment that adds takes up an area.
In the present invention, flue gas is the optimal value considering flue gas resistance, gas residence time and activated coke cavity size by the flow velocity of absorption cavity void tower.If flue gas flow rate is too high, then flue gas is excessive by the resistance of active focus layer, and flue gas is too short by the time of staying of active focus layer, is unfavorable for adsorption reaction; If flue gas flow rate is too low, then the size of inevitable requirement activated coke cavity increases, and adds equipment investment and adsorption tower occupation of land.
Claims (4)
1. a multiple field activated coke gas cleaning adsorption tower, it is characterized in that: comprise the feeding warehouse (1) be connected from top to bottom, distribution bin (3), absorption cavity (4) and discharge bin (6), described feeding warehouse (1) is positioned at adsorption tower top, two groups of absorption cavity (4) are positioned at two middle side positions of adsorption tower, two distribution bin (3) are positioned between corresponding feeding warehouse (1) and absorption cavity (4), discharge bin (6) is positioned at the bottom of absorption cavity (4), often group absorption cavity is made up of some layers of adsorption layer, the bottom of each layer adsorption layer is all provided with a frequency conversion type major axis discharger (5), the length of this frequency conversion type major axis discharger (5) runs through whole absorption cavity (4), flue gas divides two strands perpendicular through two groups of absorption cavity (4), and flue gas is 0.2 ~ 0.6m/s by the flow velocity of absorption cavity void tower, the void tower time of staying of described flue gas in absorption cavity is 5 ~ 10s, and the thickness D of described often group absorption cavity (4) is 1.5 ~ 3.0m, and the height H of described absorption cavity (4) is 16 ~ 30m.
2. multiple field activated coke gas cleaning adsorption tower according to claim 1, it is characterized in that: be provided with inlet valve (2) between described feeding warehouse (1) and distribution bin (3), discharge bin (6) outlet is provided with discharge valve (7).
3. multiple field activated coke gas cleaning adsorption tower according to claim 1, is characterized in that: any point on the wall of described distribution bin (3) and the inclination alpha of feeding warehouse (1) line of centres are greater than 40 °.
4. multiple field activated coke gas cleaning adsorption tower according to claim 1, is characterized in that: any point on the wall of described discharge bin (6) and the angle of inclination beta of the discharge port line of centres are greater than 45 °.
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| CN103203182B (en) * | 2013-02-28 | 2015-01-14 | 煤炭科学技术研究院有限公司 | Flue gas combined desulfurization denitration demercuration device and method |
| CN103230724B (en) * | 2013-04-22 | 2015-04-08 | 西安西热锅炉环保工程有限公司 | New cross-convective flue gas purification absorption tower |
| CN103230723B (en) * | 2013-04-22 | 2015-01-07 | 西安西热锅炉环保工程有限公司 | Annular sectional cross-flow fume cleaning adsorption tower |
| CN106669357B (en) * | 2017-03-03 | 2023-01-31 | 国家能源集团科学技术研究院有限公司 | Multipoint distribution flow equalizing device |
| CN107433106A (en) * | 2017-08-29 | 2017-12-05 | 中国科学院过程工程研究所 | A kind of gas cleaning absorption tower and its processing method |
| CN109603520B (en) * | 2018-12-17 | 2024-04-26 | 中冶南方都市环保工程技术股份有限公司 | Layered cross-flow active coke desulfurization, denitrification and dedusting integrated adsorption device and use method |
| CN111470555A (en) * | 2020-04-23 | 2020-07-31 | 立达超微工业（苏州）有限公司 | Device for promoting removal of high-concentration phosphorus in wastewater by calcite |
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| JP3485453B2 (en) * | 1997-10-01 | 2004-01-13 | 住友重機械工業株式会社 | Desorption method of activated carbon adsorbing dioxin in waste gas treatment equipment of garbage incinerator |
| CN201140010Y (en) * | 2007-12-27 | 2008-10-29 | 盐城中科节能环保技术创新服务有限公司 | Impulse inverse air draft bag-type dust-collector |
| CN101721882A (en) * | 2009-12-15 | 2010-06-09 | 中电投远达环保工程有限公司 | Circulating cooling system for active coke dry-method desulfuration adsorption tower moving bed and method |
| CN102091484B (en) * | 2010-12-07 | 2012-07-04 | 哈尔滨工业大学（威海） | Integrated device for removal of dusts and gaseous pollutants |
| CN102350147B (en) * | 2011-07-06 | 2013-08-14 | 哈尔滨工业大学（威海） | Integrative adsorptive dust collection device |
| CN202860366U (en) * | 2012-10-23 | 2013-04-10 | 西安热工研究院有限公司 | Layered activated coke adsorption tower used for removing multiple pollutants in smoke |
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