CN101862587A - Wet flue-gas desulfurization tower based on baffle air distribution - Google Patents
Wet flue-gas desulfurization tower based on baffle air distribution Download PDFInfo
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- CN101862587A CN101862587A CN 201010170455 CN201010170455A CN101862587A CN 101862587 A CN101862587 A CN 101862587A CN 201010170455 CN201010170455 CN 201010170455 CN 201010170455 A CN201010170455 A CN 201010170455A CN 101862587 A CN101862587 A CN 101862587A
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Abstract
The invention discloses a wet flue-gas desulfurization tower based on baffle air distribution. A flue-gas outlet is formed at the top of the desulfurization tower, and a desulfurizer slurry tank is arranged at the bottom thereof; a flue-gas inlet tilting downwards, a baffle air distribution area, a slurry spraying area and a demister area are sequentially arranged from the desulfurizer slurry tank at the bottom thereof to the flue-gas outlet at the top thereof; the desulfurizer slurry tank is connected with the slurry spraying area via an external slurry circulating pump; and the desulfurizer slurry tank is further connected to an external limestone slurry supplying device and an air oxidation system. Accordingly, the flue gas entering the desulfurization tower is subjected to baffle air distribution to form an even and upward turbulent flow; then, the flue gas further passes through the slurry spraying area arranged in a staggered manner, so that SO2 in the flue gas can be converted into CaSO3; the generated CaSO3, along with the absorption slurry, drops into the slurry tank at the lower part of the desulfurization tower drop by drop; and finally, the CaSO3 is oxidized into plaster. Compared with the wet flue-gas desulfurization tower based on even air distribution, the wet flue-gas desulfurization tower of the invention has the characteristics of simple structure and low cost; and for less components are arranged in the desulfurization tower, thus reducing the influence on the internal pressure drop of the desulfurization tower.
Description
Technical field
The present invention relates to purification treatment technology, be specifically related to a kind of dividing plate cloth humidifying method desulfurizing tower device flue gas that coal-fired power station boiler discharges.
Background technology
In the primary energy of China constituted, coal occupied critical leading position.Based on the thermal power generation of fire coal but can produce a large amount of polluters during coal combustion, be the pollution sources of present China air pollution emission maximum, its harmfulness has become common recognition.The SO that fire coal brings
2Pollute the subject matter of being not only Chinese air environmental pollution with acid rain, still restrict the important environmental factor of economic stable coordination development at present.In general, SO
2SO in total emission volumn and the flue gas
2The concentration increment rate is relevant with the sulfur content of Coal-fired capacity and fire coal.Power industry is as coal-fired rich and influential family, and it is more than half that the coal quantity of consumption accounts for national coal total output, and for many years in China's electric structure the thermoelectricity proportion high, all-the-time stable is about 80%.Therefore, power industry is China SO
2Most important emission source, the SO of control in the power generation process
2Discharging, the serious acid rain pollution problem has great importance for solving day by day.
At present, flue gas desulphurization technology commonly used mainly contains wet method, dry method and semidry method etc.Wherein, wet fuel gas desulfurizing technology has become the flue gas desulfurization technique of main flow owing to have advantages such as operational reliability is good, desulfuration efficiency is high, coal adaptability is strong.In wet fuel gas desulfurizing technology, desulfurizing tower is the core component of whole technology, and desulfurizing tower commonly used mainly contains spray column, liquid column tower, bubble tower and double etc.In these towers, advantage such as that spray column has is simple in structure, resistance is little has obtained to use widely.
But, for present traditional desulfurizing tower,, flue gas flows because entering then to turn in the tower upwards from side direction, and this has just caused inhomogeneous that the gas-liquid two-phase flow velocity distributes in the tower, will make the tower internal drop increase like this, and desulfuration efficiency reduces.A kind of tower for flue gas desulfurization in homogeneous air-humidifying method device of the inventor (patent No.: 201010138758.3) compare with the present invention and mainly exist the tower inner member many, the more relatively and relatively large shortcoming of investment once to tower internal drop influence, the present invention has proposed a kind of wet flue-gas desulfurization tower based on baffle air distribution device in order to solve above-mentioned shortcoming.
Summary of the invention
Purpose of the present invention is exactly the desulfurizing tower device that a kind of sulfur method of dividing plate cloth humidifying method flue gas and the gas-liquid two-phase flow field that can evenly distribute thereof will be provided.
Technical scheme of the present invention
A kind of wet flue-gas desulfurization tower based on baffle air distribution device
A kind of wet flue-gas desulfurization tower based on baffle air distribution device, comprise desulfurizing tower 8, described desulfurizing tower 8 comprises smoke inlet 3, exhanst gas outlet 7, desulfurization product plasma discharge mouth 1, slurries spray district 5, demister district 6, desulfurizer slurry pond 9, the outside device for supplying 10 of lime stone slurry, oxidation air system 11 and slurry circulating pump 2 and dividing plate wind region 4;
Exhanst gas outlet 7 is opened at the top of desulfurizing tower 8, and desulfurizer slurry pond 9 is located at the bottom of desulfurizing tower 8, and desulfurizer slurry pond 9 bottom sides have desulfurization product plasma discharge mouth 1;
The outside device for supplying 10 of lime stone slurry is connected with desulfurizer slurry pond 9 respectively with oxidation air system 11;
The desulfurizer slurry pond, bottom 9 of desulfurizing tower 8 and top exhanst gas outlet 7 are provided with downward-sloping smoke inlet 3, dividing plate wind region 4, slurries spray district 5, demister district 6 from bottom to top successively, and slurries pond 9 sprays between the district 5 with slurries and links to each other by external slurry circulating pump 2;
Downtilt angles between smoke inlet 3 and the horizontal plane is 10～20 °, dividing plate wind region 4 districts in the place ahead of smoke inlet 3 are provided with one and thickly are the dividing plate of 0.2m, its width extends to the tower center always, and its inclination angle is consistent with the inclination angle of smoke inlet 3, is downward 10～20 a ° inclination angle;
Slurries spray district 5 is provided with the lime stone slurry spraying layer of 3 floor interlaced arrangement;
The drop that the demister district, top 6 of desulfurizing tower 8 can remove in the flue gas.
A kind of application of wet flue-gas desulfurization tower based on baffle air distribution device
Adopt above-mentioned a kind of wet flue-gas desulfurization tower based on baffle air distribution device to carry out desulfurization, the technical process of its desulfurization is as follows:
The flue gas that needs desulfurization is at first passed through the dedusting preliminary treatment, to send into desulfurizing tower through desulfurizing tower bottom inlet with downward-sloping angle through the flue gas of pre-dust removal process, then carry out rectification so that flue gas flow field is evenly distributed through the dividing plate wind region, the flue gas spraying layer of top interlaced arrangement in the desulfurizing tower of flowing through then, with the lime stone slurry drop counter current contacting of spraying layer ejection, wherein contained SO
2Be absorbed and form CaSO
3, flue gas has also been strengthened the gas-liquid mass transfer between flue gas and the slurries simultaneously owing to the spray rectification that is subjected to slurries makes its Flow Field Distribution more even at this moment, has promoted SO
2Absorption.
Lime stone slurry absorbs SO
2Form CaSO
3After, contain CaSO
3Fall in the slurries pond of desulfurizing tower bottom, sufficient oxidation reaction takes place with air, the by-produced gypsum that is generated is discharged through the calcium plaster liquid pump in bottom, slurries pond, simultaneously, the flow through demister of desulfurizing tower upper area of clean flue gas after the desulfurization, remove drop entrained in the flue gas, the clean flue gas of gained is drawn from the desulfurizing tower top exit and is entered chimney.
Wherein inlet flue gas preferably with become with horizontal plane 10～20 ° in lower angle is introduced desulfurizing tower, flow process increases after can making flue gas enter desulfurizing tower like this, make on the one hand the damp impacts of flue gas to offside tower wall, and make and the time lengthening that flue gas flow direction deflects and puts in order help the even distribution of flue gas flow field; Also prolong the time of contact of gas-liquid two-phase in tower on the other hand, helped the carrying out of desulphurization reaction.
Lime stone slurry pH value in the above-mentioned desulfurizing tower slurries pond is controlled at 5.4～5.6 and is advisable.Like this, can guarantee that lime stone has suitable rate of dissolution to provide and SO
2Reaction
With
, so that the SO in the flue gas
2All the time be in the optimum chemical reactiveness with lime stone slurry, with further raising SO
2Removal efficiency.
In the above-mentioned technology, SO
2At first water-soluble, generate H
2SO
3, then with lime stone slurry in the CaCO that dissolves
3Reaction generates CaSO
3, its chemical equation is:
Simultaneously, the air that blasts in the slurries pond constantly with CaSO
3Reaction generates CaSO
4, its chemical equation is:
Gypsum slurries is discharged through the calcium plaster liquid pump in bottom, slurries pond, removes wherein contained moisture by hydrocyclone and vacuum belt dewaterer, finally obtains by-produced gypsum.
Beneficial effect of the present invention
A kind of wet flue-gas desulfurization tower based on baffle air distribution device provided by the invention and a kind of tower for flue gas desulfurization in homogeneous air-humidifying method device (patent No.: 201010138758.3) compare, wind region of the present invention has only replaced a kind of two-layer venturi mozzle layer of tower for flue gas desulfurization in homogeneous air-humidifying method device with a dividing plate, have simple in structure, cost is low, because the tower inner member is few, the tower internal drop is influenced little characteristics simultaneously thereby have.
Description of drawings
Fig. 1, dividing plate cloth wind and smoke qi exhaustion sulphur apparatus structure schematic diagram
A-A direction schematic diagram in Fig. 2, the dividing plate cloth wind and smoke qi exhaustion sulphur apparatus structure schematic diagram
Fig. 3, numerical simulation tradition desulfurizing tower cross section flue gas flow field speed cloud atlas
Fig. 4, numerical simulation dividing plate cloth wind fume desulfurizing tower cross section flue gas flow field speed cloud atlas
The specific embodiment
In conjunction with the accompanying drawings technology of the present invention and device thereof are further specified at a coal-burning boiler unit institute discharged flue gas below.
The structural representation of dividing plate cloth wind fume desulfurizing tower as shown in Figure 1, the A-A direction view in its median septum cloth wind and smoke qi exhaustion sulphur tower structure schematic diagram as shown in Figure 2.
A kind of wet flue-gas desulfurization tower based on baffle air distribution device, comprise desulfurizing tower 8, described desulfurizing tower 8 comprises smoke inlet 3, exhanst gas outlet 7, desulfurization product plasma discharge mouth 1, slurries spray district 5, demister district 6, desulfurizer slurry pond 9, the outside device for supplying 10 of lime stone slurry, oxidation air system 11 and slurry circulating pump 2 and dividing plate wind region 4;
Exhanst gas outlet 7 is opened at the top of desulfurizing tower 8, and desulfurizer slurry pond 9 is located at the bottom of desulfurizing tower 8,
The outside device for supplying 10 of lime stone slurry is connected with desulfurizer slurry pond 9 respectively with oxidation air system 11;
The desulfurizer slurry pond, bottom 9 of desulfurizing tower 8 and top exhanst gas outlet 7 are provided with downward-sloping smoke inlet 3, dividing plate wind region 4, slurries spray district 5, demister district 6 from bottom to top successively, and slurries pond 9 sprays between the district 5 with slurries and links to each other by external slurry circulating pump 2;
Angle of inclination between smoke inlet 3 and the horizontal plane is 10～20 °, dividing plate wind region 4 districts in the place ahead of smoke inlet 3 are provided with one and thickly are the dividing plate of 0.2m, its width extends to the tower center always, and its inclination angle is consistent with the inclination angle of smoke inlet 3, is downward 10～20 a ° inclination angle;
Slurries spray district 5 is provided with the lime stone slurry spraying layer of 3 floor interlaced arrangement;
Desulfurizing tower top is provided with demister district 6 to remove the drop in the flue gas.
Adopt the fume desulfurizing tower of traditional non-dividing plate cloth wind to carry out desulfurization
From the flue gas of boiler discharge, wherein SO
2Concentration is 1500mg/m
3, be 6785m through after the electric cleaner dedusting, selecting flue gas flow by booster fan
3/ h sends in the desulfurizing tower 8 through the smoke inlet 3 of desulfurizing tower 8, flue gas is divided into two-way, forming one respectively upwards flows with an anticlockwise vortex clockwise, and continue upwards to flow, pass the spray district 5 of interlaced arrangement above in desulfurizing tower 8, the lime stone slurry in the slurries pond 9 is 67.85m through lime stone slurry circulating pump 2 with the flow
3/ h constantly is transported to spray district 5, through the nozzle ejection, contacts with flue gas adverse current, thereby finishes desulfurization.Simultaneously, lime stone slurry device for supplying 10 is supply lime stone slurry in slurries pond 9 constantly, keeps its pH value between 5.4～5.6; 11 of simultaneous oxidation air systems are air supply in slurries pond 9 constantly, with CaSO
3Be oxidized to CaSO
4, the gypsum slurries of generation is then discharged by desulfurizing byproduct plasma discharge mouth 1, forms by-produced gypsum after dewatering, and smoke outlet utilizes moral Figure 35 0XL flue gas analyzer to measure outlet SO
2It is 93.7% that concentration, calculating can get desulfuration efficiency.
Limestone particle size in the used lime stone slurry is 30-50 μ m, and the slurries solid content is 20wt%, import SO
2Concentration is 1500mg/m
3
Embodiment 3
The fume desulfurizing tower of employing dividing plate cloth wind of the present invention carries out desulfurization
From the flue gas of boiler discharge, wherein SO
2Concentration is 1500mg/m
3, be 6785m through after the electric cleaner dedusting, selecting flue gas flow by booster fan
3/ h sends in the desulfurizing tower 8 through the smoke inlet 3 of desulfurizing tower 8, flue gas forms equally distributed flue gas turbulent flow through dividing plate 4 rectifications, and continue upwards to flow, pass the spray district 5 of interlaced arrangement above in desulfurizing tower 8, the lime stone slurry in the slurries pond 9 is 67.85m through lime stone slurry circulating pump 2 with the flow
3/ h constantly is transported to spray district 5, through the nozzle ejection, contacts with flue gas adverse current, thereby finishes desulfurization.Simultaneously, lime stone slurry device for supplying 10 is supply lime stone slurry in slurries pond 9 constantly, keeps its pH value between 5.4～5.6; 11 of simultaneous oxidation air systems are air supply in slurries pond 9 constantly, with CaSO
3Be oxidized to CaSO
4, the gypsum slurries of generation is then discharged by desulfurizing byproduct plasma discharge mouth 1, forms by-produced gypsum after dewatering, and smoke outlet utilizes moral Figure 35 0XL flue gas analyzer to measure outlet SO
2It is 97.1% that concentration, calculating can get desulfuration efficiency.
Limestone particle size in the used lime stone slurry is 30-50 μ m, and the slurries solid content is 20wt%, import SO
2Concentration is 1500mg/m
3
Fig. 3 is the CFD analog result of the flue gas flow field speed cloud atlas on the traditional desulfurizing tower cross section.
Fig. 4 is the CFD analog result of the desulfurizing tower cross section flue gas flow field speed cloud atlas of employing dividing plate cloth wind.
Can find out intuitively from Fig. 3 and Fig. 4, compare with traditional desulfurizing tower that the uniformity that the flue gas flow rate in the dividing plate cloth wind desulfurizing tower distributes has obtained tangible improvement, this has also verified the reasonability of this invention theoretically.
Above said content only is the basic explanation of the present invention under conceiving, and according to any equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.
Claims (6)
1. wet flue-gas desulfurization tower based on baffle air distribution device, comprise desulfurizing tower (8), described desulfurizing tower (8) comprises smoke inlet (3), exhanst gas outlet (7), desulfurization product plasma discharge mouth (1), slurries spray district (5), demister district (6), desulfurizer slurry pond (9), the outside device for supplying (10) of lime stone slurry, oxidation air system (11) and slurry circulating pump (2), it is characterized in that also comprising dividing plate wind region (4);
Described exhanst gas outlet (7) is opened at the top of desulfurizing tower (8), and desulfurizer slurry pond (9) are located at the bottom of desulfurizing tower (8), and desulfurizer slurry pond (9) bottom side has desulfurization product plasma discharge mouth (1); Be provided with smoke inlet (3), dividing plate wind region (4), slurries spray districts (5) and demister district (6) between described desulfurizer slurry pond (9) and the top exhanst gas outlet (7) from bottom to top successively;
Wherein desulfurizer slurry pond (9) are distinguished between (5) with the slurries spray and are linked to each other by external slurry circulating pump (2);
The outside device for supplying of lime stone slurry (10) is connected with desulfurizer slurry pond (9) respectively with oxidation air system (11).
2. a kind of wet flue-gas desulfurization tower based on baffle air distribution device as claimed in claim 1 is characterized in that described dividing plate wind region (4) district is provided with a dividing plate.
3. a kind of wet flue-gas desulfurization tower based on baffle air distribution device as claimed in claim 2 is characterized in that the thick 0.2m of being of described dividing plate, and its width extends to the tower center always, and its inclination angle is consistent with smoke inlet (3) inclination angle.
4. a kind of wet flue-gas desulfurization tower based on baffle air distribution device as claimed in claim 1 is characterized in that the downtilt angles between described smoke inlet (3) and the horizontal plane is 10～20 °.
5. a kind of wet flue-gas desulfurization tower based on baffle air distribution device as claimed in claim 1 is characterized in that described slurries spray districts (5) are provided with the spraying layer of interlaced arrangement.
6. a kind of wet flue-gas desulfurization tower based on baffle air distribution device as claimed in claim 2 is characterized in that the spraying layer that described slurries spray districts (5) are provided with interlaced arrangement is 3 floor.
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|---|---|---|---|
| CN 201010170455 CN101862587A (en) | 2010-05-10 | 2010-05-10 | Wet flue-gas desulfurization tower based on baffle air distribution |
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|---|---|---|---|
| CN 201010170455 CN101862587A (en) | 2010-05-10 | 2010-05-10 | Wet flue-gas desulfurization tower based on baffle air distribution |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102512943A (en) * | 2011-11-29 | 2012-06-27 | 南京龙玖环境工程有限公司 | Smoke desulfurization tower with smashing device |
| CN102941011A (en) * | 2012-11-26 | 2013-02-27 | 广东依科电力技术有限公司 | Spray desulfurizer and working method thereof |
| CN103182242A (en) * | 2012-11-26 | 2013-07-03 | 广东依科电力技术有限公司 | Spray tower for desulfurization project |
| CN103432893A (en) * | 2013-08-15 | 2013-12-11 | 内蒙古包钢钢联股份有限公司 | Wet flue gas desulfurization device and method |
| CN105056723A (en) * | 2015-07-29 | 2015-11-18 | 浙江富春江环保热电股份有限公司 | Twin-tower type flue gas deep purification device through plasma coupling and sodium based absorption and method thereof |
| CN110465170A (en) * | 2018-05-10 | 2019-11-19 | 中国石油化工股份有限公司 | A kind of desulfurizing tower and flue gas ash removal, desulfurization and wastewater treatment method |
| CN110559816A (en) * | 2018-06-05 | 2019-12-13 | 中国石油化工股份有限公司 | Flue gas desulfurization tower and flue gas dedusting, desulfurization and wastewater treatment process |
| CN113617198A (en) * | 2021-08-31 | 2021-11-09 | 王玉祥 | Flue gas desulfurization and purification system |
| CN114073888A (en) * | 2020-08-14 | 2022-02-22 | 华电国际电力股份有限公司技术服务分公司 | Optimization method of oxidizing air system in limestone-gypsum wet desulphurization system |
| CN114849459A (en) * | 2022-05-16 | 2022-08-05 | 中国神华煤制油化工有限公司 | Wet desulphurization spherical tower, application thereof and wet desulphurization process |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102512943A (en) * | 2011-11-29 | 2012-06-27 | 南京龙玖环境工程有限公司 | Smoke desulfurization tower with smashing device |
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| CN102941011A (en) * | 2012-11-26 | 2013-02-27 | 广东依科电力技术有限公司 | Spray desulfurizer and working method thereof |
| CN103182242A (en) * | 2012-11-26 | 2013-07-03 | 广东依科电力技术有限公司 | Spray tower for desulfurization project |
| CN103432893A (en) * | 2013-08-15 | 2013-12-11 | 内蒙古包钢钢联股份有限公司 | Wet flue gas desulfurization device and method |
| CN105056723B (en) * | 2015-07-29 | 2017-04-12 | 浙江富春江环保热电股份有限公司 | Twin-tower type flue gas deep purification device through plasma coupling and sodium based absorption and method thereof |
| CN105056723A (en) * | 2015-07-29 | 2015-11-18 | 浙江富春江环保热电股份有限公司 | Twin-tower type flue gas deep purification device through plasma coupling and sodium based absorption and method thereof |
| CN110465170A (en) * | 2018-05-10 | 2019-11-19 | 中国石油化工股份有限公司 | A kind of desulfurizing tower and flue gas ash removal, desulfurization and wastewater treatment method |
| CN110559816A (en) * | 2018-06-05 | 2019-12-13 | 中国石油化工股份有限公司 | Flue gas desulfurization tower and flue gas dedusting, desulfurization and wastewater treatment process |
| CN114073888A (en) * | 2020-08-14 | 2022-02-22 | 华电国际电力股份有限公司技术服务分公司 | Optimization method of oxidizing air system in limestone-gypsum wet desulphurization system |
| CN114073888B (en) * | 2020-08-14 | 2024-01-26 | 华电国际电力股份有限公司技术服务分公司 | Optimization method of oxidation wind system in limestone-gypsum wet desulfurization system |
| CN113617198A (en) * | 2021-08-31 | 2021-11-09 | 王玉祥 | Flue gas desulfurization and purification system |
| CN114849459A (en) * | 2022-05-16 | 2022-08-05 | 中国神华煤制油化工有限公司 | Wet desulphurization spherical tower, application thereof and wet desulphurization process |
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Application publication date: 20101020 |