CN101703884A - Wet desulfurization tower based flue gas desulphurization method capable of enhancing adaptability to low load - Google Patents
Wet desulfurization tower based flue gas desulphurization method capable of enhancing adaptability to low load Download PDFInfo
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- CN101703884A CN101703884A CN200910311850A CN200910311850A CN101703884A CN 101703884 A CN101703884 A CN 101703884A CN 200910311850 A CN200910311850 A CN 200910311850A CN 200910311850 A CN200910311850 A CN 200910311850A CN 101703884 A CN101703884 A CN 101703884A
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Abstract
The invention relates to a wet desulfurization tower based flue gas desulphurization method capable of enhancing the adaptability to low load, solving the problems as follows: when the load of the desulfurization tower is lowered (the load is lower than 30% of the amount of flue gas under rated load of the desulfurization tower), the amount of the flue gas flowing through the desulfurization tower is lessened; therefore, the demisting efficiency of a demister can not be maintained, the desulfurization efficiency is reduced and fly ash and liquid drops at the entrance and exit of the tower settle. The method mainly comprises the following steps: exhausting the flue gas desulfurized in the desulfurization tower after being demisted; and separating partial purified flue gas from all the purified flue gas under automatic regulation of a circulatory flue gas regulator when the load of a desulfurization system is lower than 30% of the rated load, and ensuring the partial purified flue gas to return back to the entrance of the desulfurization tower via a circulatory flue gas pipe, thus accelerating the air speed in the tower and ensuring the flue gas load in the desulfurization tower at the lower limit of at least 30% of the rated load under which the desulfurization tower can operate stably. The method enables the wet desulfurization tower to safely and stably operate under the condition of meeting 0%-110% of rated load and obviously enhances the adaptability of the desulfurization system to low load.
Description
Technical field
The present invention relates to a kind of fume desulphurization method, particularly relate to and a kind ofly have the fume desulphurization method that strengthens the underload conformability, belong to industrial waste gas purifying environmental protection field based on wet desulfuration tower.
Background technology
Wet process of FGD is to use in the world at present at most, the most effective sulfur removal technology, but wet desulfuration tower has certain load adaptability, generally energy stable operation under 30% to 110% desulfurizing tower rated load, when load is lower than 30% desulfurizing tower rated load, can cause a series of problems: the general inertial separation demister that adopts in (1) desulfurizing tower, when flue gas flow rate descends, a large amount of droplets that clean flue gas carries after the desulfurization are because droplet inertia power and centrifugal force decline, separative efficiency descends, promptly remove fog effect and significantly weaken, cause desulfurization clean flue gas tail flue gas passage and equipment normally to move; (2) decline of desulfurizing tower flue gas flow rate causes air velocity distribution skewness in the desulfurizing tower, and the high flue gas flow rate of regional area causes the flue gas corridor, and desulfuration efficiency descends; (3) desulfurizing tower inlet and outlet flue gas flow rate descend, and flying dust that flue gas carries and drop will can cause obstruction when serious in tower inlet and outlet bottom deposit.Based on the above, when the load of desulfurizing tower during less than 30% rated load, the minimizing of exhaust gas volumn cause the flowing through flue gas flow rate of demister reduces, the demist deleterious, making flue gas after the desulfurization contain the droplet amount rises, cause the burn into of back-end ductwork, chimney and equipment to stop up, finally cause desulphurization system or shutdown of boiler, and in desulphurization system (particularly for Industrial Boiler or adopt the desulphurization system of many stove one towers) running, the operating load of desulfurizing tower is lower than 30% rated load sometimes.Therefore, propose a kind ofly when desulfurizing tower load reduces, the method that still can keep demist efficient, the desulfuration efficiency of demister in the desulfurizing tower and solve tower gateway place's flying dust and droplet settling problem is very necessary.
Summary of the invention
The purpose of this invention is to provide a kind of fume desulphurization method that strengthens the underload conformability that has based on wet desulfuration tower, to solve when the desulfurizing tower load is lower than 30% rated load exhaust gas volumn and tails off, the demist efficient of demister can't keep in the desulfurizing tower, desulfuration efficiency reduces and the problem of flying dust and droplet settling is located in the tower gateway.
The present invention solves the problems of the technologies described above the technical scheme of taking to be: the inventive method is described to be had the fume desulphurization method that strengthens the underload conformability based on wet desulfuration tower and adopts wet desulfuration tower to carry out, and described fume desulphurization method is realized according to following steps:
Step 1, at first in the desulfurizing tower body, add calcium-based slurries, contain 5～8% (quality) gypsum seed in the described calcium-based slurries, air hose is set in the bottom of desulfurizing tower in order to CaSO to be provided
3The required oxygen of oxidation is provided with agitator in order to stir calcium-based slurries on the sidewall of desulfurizing tower body;
The invention has the beneficial effects as follows:
Patent of the present invention mainly is to propose at overcoming the desulfurizing tower adaptability problem that causes when being lower than 30% rated load, when load is lower than 30% rated load, this patent adopts the method that increases flue gas flow in the desulfurizing tower, guarantee to enter the desulfurizing tower flue gas flow rate and guaranteeing that demister removes within the flue gas flow rate scope of fog effect, the flue gas flow of having avoided flowing into desulfurizing tower reduces the corrosion of back-end ductwork behind the tower that causes, equipment and obstruction and the problem that can't normally move that causes; Flue gas flow rate rises, and has avoided flying dust and drop in smoke inlet and outlet bottom deposit, thereby avoids inlet and exit fouling and cause problems such as underdeposit corrosion and obstruction; Flue gas flow rate rises, and air-flow distributes and is tending towards evenly helping avoiding the flue gas corridor in the desulfurizing tower, can guarantee the desulfuration efficiency of desulfurizing tower.
When the inventive method has realized utilizing wet desulfuration tower that flue gas is carried out desulfurization, the inlet flue gas load is lower than the fog effect that removes that guaranteed desulfurizing tower at 30% o'clock, make the corrosion and the obstruction of back-end ductwork after the unlikely desulfurization of flue gas after the desulfurization, chimney and equipment, guarantee the desulphurization system safe operation.Under the circulating flue gas adjuster was automatically regulated, when the desulphurization system load was lower than 30% rated load, the clean flue gas of clean flue gas shunting part after purify was back to the desulfurizing tower inlet again by the circulating flue gas pipeline, made that gas speed increases in the tower, strengthened and removed fog effect.Thereby make wet desulfuration tower (desulphurization system) can satisfy safe and stable operation under 0% to 110% rated load, significantly strengthened the underload conformability of desulphurization system.Herein, the clean flue gas of the present invention's recirculation can enter the mouth by the desulfurizing tower body that air-introduced machine produces or the negative pressure of booster fan inlet circulates automatically, need not increases extra power set, have energy-conservation, regulating system is simple, property height safe and reliable to operation, investment advantage such as lower.
Description of drawings
Fig. 1 is the structural representation (air-introduced machine is located at the afterbody of desulfurizing tower) of the wet desulfuration tower that uses in the specific embodiment of the invention two described methods, and Fig. 2 is the structural representation (the desulfurization booster fan is located at the front portion of desulfurizing tower) of the wet desulfuration tower that uses in the specific embodiment of the invention three described methods.
The specific embodiment
The specific embodiment one: as depicted in figs. 1 and 2, present embodiment is described to be had the fume desulphurization method that strengthens the underload conformability based on wet desulfuration tower and adopts wet desulfuration tower to carry out, described fume desulphurization method is realized according to following steps: step 1, at first add calcium-based slurries in desulfurizing tower body 9, contain 5～8% (quality) gypsum seed in the described calcium-based slurries, air hose 8 is set in the bottom of desulfurizing tower in order to CaSO to be provided
3Required oxygen (the CaSO of oxidation
3Be by the SO in the flue gas
2With the CaCO in the calcium-based slurries
3Or Ca (OH)
2Reaction generates), agitator 7 is set in order to stir calcium-based slurries on the sidewall of desulfurizing tower body 9;
The specific embodiment two: as shown in Figure 1, present embodiment is in the step 3 of the specific embodiment, desulfurizing tower body 9 entrance negative pressures that utilize air-introduced machine 14 to be produced, the partial fume of air-introduced machine 14 outlets is drawn back automatically, mixed the formation mixed flue gas with the pending flue gas that enters pipe 13 from flue gas and together flow into desulfurizing tower body 9; Flue gas after the desulfurization in desulfurizing tower body 9 tops is extracted out; With outlet header 16 that smoke discharge tube 2 and circulating flue gas pipe 4 all are communicated with on air-introduced machine 14 is set, the flue gas part after the desulfurization is discharged from smoke discharge tube 2, another branch flows in the desulfurizing tower bodies 9 through desulfurizing tower inlet 6 from circulating flue gas pipe 4.Other step is identical with the specific embodiment one.
As Fig. 1, when desulphurization system was loaded greater than 30% rated load, this moment, the desulfurizing tower internal loading satisfied the adaptability requirement, and former flue gas enters desulfurizing tower body 9, with by 10 dozens of recycle slurry liquid pumps desulfurization slurry counter current contacting to spraying layer 11 atomizings, clean flue gas effluxes through air-introduced machine 14 after the desulfurization; When the desulphurization system load is lower than 30% rated load, for guaranteeing the lower limit of flue gas load at least 30% rated load in the desulfurizing tower, export the partial fume of shunting by circulating flue gas pipe 4 from air-introduced machine 14, after circulating flue gas adjuster 3 adjusting backflow cigarette amounts, under the effect of desulfurizing tower entrance negative pressure, enter desulfurizing tower after merging with former flue gas, clean flue gas is discharged by air-introduced machine 14 in desulfurizing tower after the desulfurization, part is recycled to desulfurizing tower body 9 inlets, and all the other flue gases efflux as purifying flue gas.
The specific embodiment three: as shown in Figure 2, present embodiment adopts desulfurization booster fan 5 that mixed flue gas is blasted in the desulfurizing tower body 9 in specific embodiment step 3; Desulfurization booster fan 5 is set entering on pipe 13 and the smoke inlet house steward 15 that all is communicated with of circulating flue gas pipe 4, the flue gas after pending flue gas and the desulfurization is blasted in the desulfurizing tower body 9 by desulfurization booster fan 5 with flue gas.Other step is identical with the specific embodiment one.
As Fig. 2, when desulphurization system was loaded greater than 30% rated load, this moment, the desulfurizing tower internal loading satisfied the adaptability requirement, and the former flue gas of desulfurization booster fan 5 outlets enters desulfurizing tower 9, with by 10 dozens of recycle slurry liquid pumps desulfurization slurry counter current contacting to spraying layer 11 atomizings, clean flue gas effluxes after the desulfurization; When the desulphurization system load is lower than 30% rated load, for guaranteeing the lower limit of flue gas load at least 30% rated load in the desulfurizing tower, from desulfurizing tower 9 exit portion flue gases by circulating flue gas pipe 4, behind circulating flue gas adjuster 3 adjusting air quantity, under the effect of desulfurization booster fan 5 entrance negative pressures, merge with former flue gas, again by entering desulfurizing tower after 5 superchargings of desulfurization booster fan, clean flue gas is discharged from tower after the desulfurization, part is recycled to desulfurization booster fan 5 inlets, and all the other flue gases efflux as purifying flue gas.
The specific embodiment four: the described circulating flue gas adjuster 3 of present embodiment adopts controlled electronic baffle door to regulate the capacity of returns of flue gas after desulfurization.Circulating flue gas adjuster 3 adopts controlled electronic baffle door, can be according to the flue gas flow of desulfurizing tower inlet, adjust electronic baffle door aperture by automatic control system, flue gas load in the desulfurizing tower is transferred to the load of exhaust gas volumn under the 30% desulfurizing tower rated load that can satisfy stable operation, avoid amount of circulating gas excessive, thus the power consumption of control blower fan (booster fan 5 or air-introduced machine 14).Other step is identical with the specific embodiment two or three.
Embodiment: evaporation capacity is the boiler of 65t/h, and its dry flue gas amount is 140000m under declared working condition
3/ h, when desulfurizing tower load boiler rated load (being the desulfurizing tower rated load) down exhaust gas volumn 30～110% the time, demister to remove the droplet amount that contains that fog effect can guarantee to purify in the flue gas be 75mg/m
3(quality that contains droplet in every cubic metre of dry flue gas); When the desulfurizing tower load dropped to 20%, exhaust gas volumn was 28000m
3The removing fog effect and can not satisfy the droplet amount that contains of the desulfurization dry flue gas of discharging desulfurizing tower of demister 12 in the/h, desulfurizing tower body 9 smaller or equal to 75mg/m
3This requirement, open circulating flue gas adjuster 3 this moment, and to make the smoke backflow amount be 14000m
3/ h, making exhaust gas volumn in the desulfurizing tower body 9 is 30% exhaust gas volumn of the desulfurizing tower load that requires of demister exhaust gas volumn under the boiler rated load, the droplet amount that contains that guarantees the flue gas after the desulfurization is smaller or equal to 75mg/m
3(quality of the water that contains in every cubic metre the dry flue gas).
Operation principle:
Under the automatic adjusting of circulating flue gas adjuster 3, when desulfurizing tower load be lower than exhaust gas volumn under the rated load 30% the time, the negative pressure of the desulfurizing tower porch that the clean flue gas utilization air-introduced machine 14 after purify produces or desulfurization booster fan 5 entrance negative pressures are the clean flue gas of splitter section controllably automatically, again be back to the desulfurizing tower inlet by circulating flue gas pipeline 4, make the interior gas speed of tower increase, the lower limit of exhaust gas volumn under at least 30% desulfurizing tower rated load of flue gas load energy stable operation in the assurance desulfurizing tower, thus make desulphurization system can satisfy safe and stable operation under 0% to 110% rated load.The circulating flue gas adjuster adopts controlled electronic baffle door, can be according to the flue gas flow of desulfurizing tower inlet, adjust electronic baffle door aperture by automatic control system, flue gas load in the desulfurizing tower is transferred to the load of exhaust gas volumn under the 30% desulfurizing tower rated load that can satisfy stable operation, avoid the flue gas recycled amount excessive, thereby the power consumption of control desulfurization booster fan or air-introduced machine is realized the economical operation of flue gas recirculation.
Claims (4)
1. has the fume desulphurization method that strengthens the underload conformability based on wet desulfuration tower, it is characterized in that: described fume desulphurization method adopts wet desulfuration tower to carry out, described fume desulphurization method is realized according to following steps: step 1, at first add calcium-based slurries in desulfurizing tower body (9), contain 5～8% (quality) gypsum seed in the described calcium-based slurries, air hose (8) is set in order to provide the CaSO3 oxidation required oxygen in the bottom of desulfurizing tower, agitator (7) is set on the sidewall of desulfurizing tower body (9) in order to stir calcium-based slurries;
Step 2, pending flue gas is entered pipe (13) in desulfurizing tower inlet (6) is sent into calcium-based slurries liquid level and the cavity between the spraying layer (11) in the desulfurizing tower body (9) by flue gas, by recycle slurry liquid pump (10) calcium-based slurries being evacuated to spraying layer (11) simultaneously locates to atomize, calcium-based slurries drop after the atomizing flows downward and contact with the pending flue gas adverse current that upwards flows and carries out desulphurization reaction, and the flue gas after the desulfurization continues upwards to flow after demister (12) demist from clean exhanst gas outlet (1) outflow at desulfurizing tower body (9) top; Simultaneously, desulfurizing agent lime stone or lime are added in the calcium-based slurries pond in desulfurizing tower body (9), make the calcium-based slurries pH value of desulfurizing tower body (9) entoplasm liquid pool remain on 5.0～6.0; Take out the part calcium-based slurries in desulfurizing tower body (9), carry out liquid-solid separation, isolated solid formation effluxes;
Step 3, flue gas part after the desulfurization of clean exhanst gas outlet (1) outflow is discharged from smoke discharge tube (2), another part is via circulating flue gas pipe (4) and form mixed flue gas from the pending flue gas that flue gas enters pipe (13) and together flow in the calcium-based slurries liquid level and the cavity between the spraying layer (11) in the desulfurizing tower body (9), mixed flue gas upwards flows and carries out reverse the contact with calcium-based slurries drop under spraying layer (11) spray and carry out desulphurization reaction, circulating flue gas adjuster (3) is set in order to regulate the capacity of returns of flue gas after desulfurization on circulating flue gas pipe (4), make the interior gas speed of desulfurizing tower increase, guarantee that flue gas load is at the lower limit of 30% rated load of desulfurizing tower energy stable operation in the desulfurizing tower.
2. the fume desulphurization method that has enhancing underload conformability based on wet desulfuration tower according to claim 1, it is characterized in that: in step 3, desulfurizing tower body (9) entrance negative pressure that utilizes air-introduced machine (14) to be produced, the partial fume of air-introduced machine (14) outlet is drawn back automatically, mixed the formation mixed flue gas with the pending flue gas that enters pipe (13) from flue gas and together flow into desulfurizing tower body (9); With outlet header (16) that smoke discharge tube (2) and circulating flue gas pipe (4) all are communicated with on air-introduced machine (14) is set, flue gas part after the desulfurization is discharged from smoke discharge tube (2), another branch from circulating flue gas pipe (4) in desulfurizing tower inlet (6) flows into desulfurizing tower bodies (9).
3. according to claim 1 have the fume desulphurization method that strengthens the underload conformability based on wet desulfuration tower, it is characterized in that: in step 3, adopt desulfurization booster fan (5) that mixed flue gas is blasted in the desulfurizing tower body (9); Desulfurization booster fan (5) is set entering on the smoke inlet house steward (15) that pipe (13) and circulating flue gas pipe (4) all be communicated with, the flue gas after pending flue gas and the desulfurization is blasted in the desulfurizing tower body (9) by desulfurization booster fan (5) with flue gas.
4. describedly have the fume desulphurization method that strengthens the underload conformability based on wet desulfuration tower according to claim 2 or 3, it is characterized in that: circulating flue gas adjuster (3) adopts controlled electronic baffle door to regulate the capacity of returns of flue gas after desulfurization.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102091520A (en) * | 2010-12-28 | 2011-06-15 | 哈尔滨工业大学 | Wet desulphurization device and dust-fall processing method for circulation sizing based on wet desulphurization device |
| CN102580487A (en) * | 2012-03-26 | 2012-07-18 | 煤炭工业济南设计研究院有限公司 | Double-alkali flue gas desulfurization oxidation tank |
| CN103638806A (en) * | 2013-12-11 | 2014-03-19 | 中国神华能源股份有限公司 | Method for preventing sulfur dioxide absorption tower from scaling inside |
| CN105435618A (en) * | 2015-12-11 | 2016-03-30 | 凯天环保科技股份有限公司 | Desulfurization tower and wet-process flue gas desulphurization method thereof |
| CN108640188A (en) * | 2018-05-08 | 2018-10-12 | 东南大学 | Bypass flue air-stream spraying dries desulfurizing waste water processing device and method |
| CN109915235A (en) * | 2019-04-08 | 2019-06-21 | 上海蓝魂环保科技有限公司 | Ten thousand casees wheel ship tail gas desulfurization gas gathering systems of one kind and gas collection method |
| CN110314526A (en) * | 2019-07-03 | 2019-10-11 | 西安热工研究院有限公司 | A kind of serum recycle system adjusts space calculation method and its device |
| CN111072090A (en) * | 2019-12-26 | 2020-04-28 | 浙江浙能技术研究院有限公司 | Desulfurization wastewater evaporation tower capable of maintaining constant flow field and method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102091520A (en) * | 2010-12-28 | 2011-06-15 | 哈尔滨工业大学 | Wet desulphurization device and dust-fall processing method for circulation sizing based on wet desulphurization device |
| CN102091520B (en) * | 2010-12-28 | 2012-08-22 | 哈尔滨工业大学 | Wet desulphurization device and dust-fall processing method for circulation sizing based on wet desulphurization device |
| CN102580487A (en) * | 2012-03-26 | 2012-07-18 | 煤炭工业济南设计研究院有限公司 | Double-alkali flue gas desulfurization oxidation tank |
| CN103638806A (en) * | 2013-12-11 | 2014-03-19 | 中国神华能源股份有限公司 | Method for preventing sulfur dioxide absorption tower from scaling inside |
| CN103638806B (en) * | 2013-12-11 | 2015-12-09 | 中国神华能源股份有限公司 | A kind of method preventing sulfur dioxide absorbing tower internal incrustation |
| CN105435618A (en) * | 2015-12-11 | 2016-03-30 | 凯天环保科技股份有限公司 | Desulfurization tower and wet-process flue gas desulphurization method thereof |
| CN108640188A (en) * | 2018-05-08 | 2018-10-12 | 东南大学 | Bypass flue air-stream spraying dries desulfurizing waste water processing device and method |
| CN108640188B (en) * | 2018-05-08 | 2020-12-25 | 东南大学 | Bypass flue gas flow spray drying desulfurization wastewater treatment device and method |
| CN109915235A (en) * | 2019-04-08 | 2019-06-21 | 上海蓝魂环保科技有限公司 | Ten thousand casees wheel ship tail gas desulfurization gas gathering systems of one kind and gas collection method |
| CN110314526A (en) * | 2019-07-03 | 2019-10-11 | 西安热工研究院有限公司 | A kind of serum recycle system adjusts space calculation method and its device |
| CN110314526B (en) * | 2019-07-03 | 2021-11-02 | 西安热工研究院有限公司 | Calculation method and device for adjustment space of slurry circulation system |
| CN111072090A (en) * | 2019-12-26 | 2020-04-28 | 浙江浙能技术研究院有限公司 | Desulfurization wastewater evaporation tower capable of maintaining constant flow field and method |
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Open date: 20100512 |