CN212091673U - Front-mounted dry desulphurization CFB desulphurization device - Google Patents
Front-mounted dry desulphurization CFB desulphurization device Download PDFInfo
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- CN212091673U CN212091673U CN202020404545.XU CN202020404545U CN212091673U CN 212091673 U CN212091673 U CN 212091673U CN 202020404545 U CN202020404545 U CN 202020404545U CN 212091673 U CN212091673 U CN 212091673U
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Abstract
The utility model relates to a CFB (circulating fluid bed) desulfurization device with a preposed dry desulfurization function, which comprises a desulfurizer grinding and conveying system, a desulfurizer preparation system, a water tank, a desulfurization tower, a bag-type dust remover and a circulating fluidized tank which are arranged in sequence; the desulfurizer preparation system comprises a quicklime bin, a dry digester and a slaked lime bin which are sequentially arranged; the dry digester is connected with the water tank, and a digestion water pump is arranged between the dry digester and the water tank; the desulfurizer grinding and conveying system is positioned at a flue gas inlet pipeline and comprises a mill, a desulfurizer uniform distribution device and a pipeline connected with an inlet of a desulfurizing tower; a desulfurization water gun for providing desulfurization water is arranged in the desulfurization tower, a ship-shaped ash hopper is arranged at the lower part of the bag-type dust remover, a circulating fluidization groove and a desulfurization ash warehouse are arranged at the lower part of the ship-shaped ash hopper, and the bottom of the circulating fluidization groove is connected with the desulfurization tower; the bottom of the slaked lime bin is provided with a first discharge hole and a second discharge hole.
Description
Technical Field
The utility model belongs to the technical field of flue gas desulfurization, concretely relates to leading desulfurated CFB desulphurization unit of dry process.
Background
In order to control the pollution of sulfur dioxide and acid rain, the state increases the treatment strength of sulfur dioxide in flue gas, requires the flue gas to be desulfurized, and weakens the influence of sulfur dioxide on the ecological environment to the greatest extent. The dry flue gas desulfurization technology has the advantages of wide application industry, strong adaptability, low investment and wide application in the world, but has the defects of low utilization rate of the desulfurizer and low desulfurization efficiency.
The dry desulfurizing process includes spraying desulfurizing agent powder (slaked lime 20-25 microns) into flue to activate the desulfurizing agent, increasing the specific surface area, contacting with acid fume fully to produce physical and chemical reaction and SO in the fume2Etc. are absorbed and purified.
The desulfurizing agent uniformly enters a (grinding) mill through a star-shaped ash discharge valve, a grinding disc and a grading wheel of the mill rotate at a high speed under the drive of a motor, the desulfurizing agent is crushed after being impacted by the grinding disc rotating at the high speed, the material feeding grading wheel meeting the requirements enters a downstream system, and large particles enter a grinding area again to be crushed again under the action of a special airflow guide ring until the particle size meets the design requirement. The particle size is adjusted by adjusting the speed of the grading wheel and then sprayed into the pipeline to react with the flue gas. The adoption of a grinding machine can improve the desulfurization efficiency within a certain range, but the desulfurization process still adopts gas-solid reaction, and the defects of low utilization rate of the desulfurizer and low desulfurization efficiency still exist.
The CFB semi-dry desulfurizing technology is to mix the humidified fume with sprayed slaked lime absorbent in desulfurizing tower to produce physical and chemical reaction and SO in the fume2Is absorbed and purified. By absorption of SO2And the dried powder-containing flue gas is discharged from the desulfurizing tower and enters a bag-type dust collector for purification and further desulfurization reaction. The sprayed atomized water is used for reducing the smoke temperature in the desulfurization reactor to enable the smoke temperature to be reduced to be about 20 ℃ higher than the dew point of the smoke, SO that SO is generated2And Ca (OH)2Is converted into an ionic reaction which can be completed instantly. The CFB semi-dry desulfurization efficiency is high, but the limit that the flue gas temperature and the desulfurization efficiency are mutually restricted exists. When the flue gas temperature is low and the desulfurization efficiency is high, more desulfurization water needs to be sprayed in order to meet the requirement of high desulfurization efficiency, the flue gas temperature is reduced to be below a dew point due to large temperature drop caused by excessive water spraying, the desulfurization tower body can be corroded after the flue gas is condensed, dust is attached to a rear end cloth bag in a sticky mode, air permeable holes of the cloth bag are blocked, the air permeability is reduced, ash removal is difficult and ineffective, the pressure drop of a dust remover is too large, the dust remover cannot continue to operate, and dust cannot be collected in some dust removing bags. The flue gas condensation has its adverse effects on devices such as a desulfurizing tower and a rear-end dust remover.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve dry process desulfurization inefficiency, CFB semi-dry process desulfurization make the problem of flue gas dewfall. A CFB desulfurization device with a front dry desulfurization function is disclosed. The dry desulfurization has low efficiency, but does not need water spraying and does not reduce the temperature of the flue gas. The preposed dry desulfurization reduces SO at a CFB semi-dry desulfurization inlet2The concentration reduces the water spraying amount in the desulfurizing tower, and reduces the risk of flue gas condensation while meeting the requirement of high-efficiency desulfurization. The CFB desulfurization efficiency is high, and the defect of low pre-dry desulfurization efficiency is overcome.
In order to realize the above purpose, the technical scheme of the utility model is that: a front-mounted dry desulfurization CFB desulfurization device comprises a desulfurizer grinding and conveying system, a desulfurizer preparation system, a water tank, a desulfurization tower, a bag-type dust remover and a circulating fluidized tank which are sequentially arranged; the desulfurizer preparation system comprises a quicklime bin, a dry digester and a slaked lime bin which are sequentially arranged; the dry digester is connected with the water tank, and a digestion water pump is arranged between the dry digester and the water tank; the desulfurizer grinding and conveying system is positioned at a flue gas inlet pipeline and comprises a mill, a desulfurizer uniform distribution device and a pipeline connected with an inlet of a desulfurizing tower, wherein the mill in the desulfurizer grinding and conveying system grinds desulfurizer into powder and then the powder is uniformly sprayed into the pipeline through the desulfurizer uniform distribution device; a desulfurization water gun for providing desulfurization water is arranged in the desulfurization tower, a desulfurization water pump is arranged at the input end of the desulfurization water gun, the desulfurization water pump is connected with the water tank, the outlet of the desulfurization tower is connected with the inlet of a bag-type dust collector, a ship-shaped ash bucket is arranged at the lower part of the bag-type dust collector, a circulating fluidization groove and a desulfurization ash storehouse are arranged at the lower part of the ship-shaped ash bucket, and the bottom of the circulating fluidization groove is connected with the desulfurization tower;
the bottom of the slaked lime bin is provided with a first discharge port and a second discharge port, the first discharge port is connected with a mill feed inlet of a desulfurizer grinding and conveying system, and the second discharge port is directly connected with a desulfurizing tower.
Further, the dry digester is a three-stage dry digester.
Furthermore, the bottom of the lime slaking bin and the bottom of the lime slaking bin are both cones, fluidization plates are arranged on the inner surfaces of the cones, and a roots blower is arranged to blow air to fluidize the bins.
Further, the mill comprises a grinding disc and a grading wheel.
Furthermore, the desulfurizing tower is a desulfurizing tower adopting a plurality of venturi tubes, and the bottom of the desulfurizing tower is of a streamline air inlet structure.
Furthermore, an opening adjusting valve is arranged at an inlet of the circulating fluidization groove, and a steam heating mechanism is arranged on the circulating fluidization groove.
The utility model has the advantages that: the device improves the desulfurization efficiency, increases the utilization rate of the desulfurizer, has no wastewater discharge in the process, and has strong practicability and wide applicable range.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
in the figure: the left arrow indicates a flue gas inlet, the right arrow indicates a flue gas outlet, a 1-quicklime bin, a 2-dry digester, a 3-slaked lime bin, a 4-mill, a 5-desulfurizer uniform distribution device, a 6-water tank, a 7-water pump for digestion, an 8-water pump for desulfurization, a 9-desulfurization water gun, a 10-desulfurization tower, an 11-guide plate, a 12-bag-type dust remover, a 13-ship-type dust hopper, a 14-circulating fluidization tank, a 15-desulfurization dust bin, a 16-induced draft fan and a 17-chimney.
Detailed Description
The utility model discloses a (flue gas) front-mounted dry desulphurization CFB desulphurization device. Comprises a desulfurizer grinding and conveying system, a desulfurizer preparation system, a water tank 6, an absorption tower, namely a desulfurizing tower 10, a dust remover, namely a bag-type dust remover 12, a circulating fluidization tank 14 and the like. The quicklime is stored in a quicklime bin 1 and reacts with water through a dry digester 2 to generate slaked lime. The flue gas firstly reacts with slaked lime fine powder prepared by slaked lime through a mill 4 to remove part of SO in the flue gas2. Unreacted desulfurizer powder enters a desulfurizing tower 10 together with flue gas, and a spray gun for desulfurizing water, namely a desulfurizing water gun 9, is arranged in the desulfurizing tower 10. The flue gas contacts with the newly added desulfurizer, the unreacted desulfurizer powder in the previous step and water in the desulfurizing tower 10, and the reaction is continued to perform further desulfurization. The outlet of the desulfurizing tower 10 is connected with the inlet of a dust remover, namely a bag-type dust remover 12, the lower part of the bag-type dust remover 12 is provided with a ship-shaped ash bucket 13, and the ship-shaped ash bucket 13 is used for collecting the desulfurization ash. The collected desulfurization ash part enters the desulfurization tower 10 through the circulating fluidization groove 14, so that the stability of a bed layer in the desulfurization tower 10 is ensured, and meanwhile, the utilization rate of a desulfurizing agent is greatly increased; the rest part enters a desulfurization ash storage 15 to be treated and then is discharged. The device improves the desulfurization efficiency, increases the utilization rate of the desulfurizer, has no wastewater discharge in the process, and has strong practicability and wide applicable range.
A CFB desulfurization device with a front-mounted dry desulfurization comprises a desulfurizer grinding and conveying system, a desulfurizer preparation system, a water tank 6, a desulfurization tower 10, a bag-type dust remover 12, a circulating fluidization tank 14, an induced draft fan 16, a chimney 17 and the like.
The desulfurizer grinding and conveying system is positioned at the front end, a mill 4 in the desulfurizer grinding and conveying system grinds the desulfurizer into powder and then the powder is uniformly sprayed into an inlet pipeline of a desulfurizing tower 10 through a desulfurizer uniform distribution device 5, and referring to fig. 1, the inlet pipeline is connected with an inlet of the desulfurizing tower 10. The desulfurization water gun 9 used for providing desulfurization water is arranged in the desulfurization tower 10, the outlet of the desulfurization tower 10 is connected with the inlet of a bag-type dust collector 12 through a flue, a ship-shaped ash bucket 13 is arranged at the lower part of the bag-type dust collector 12, a circulating fluidization groove 14 and a desulfurization ash storage 15 are arranged at the lower part of the ship-shaped ash bucket 13, and the bottom of the circulating fluidization groove 14 is connected with the desulfurization tower 10.
Further, the utility model discloses dry-type digester 2 among the device adopts tertiary water distribution digestion for tertiary dry-type digester, through hierarchical formula science water distribution mode, makes quick lime fully digest. The digester must be independent of the main system, and its maintenance does not affect the operation of the main system for desulfurization.
The utility model discloses the bottom in the raw and slaked lime storehouse 1 among the device, 3 is the cone, and fluidization plate is all arranged to the internal surface to set up roots's fan and give the storehouse blast air fluidization, in order to avoid the jam of unloading system. The top of the bin is provided with a bin top cloth bag dust removal device so that the discharged gas meets the requirements of pollutant discharge standards.
Furthermore, the bottom of the slaked lime bin 3 comprises a first discharge port and a second discharge port, the first discharge port is connected with the feed port of the mill 4 through a pipeline, and the second discharge port directly enters the desulfurizing tower 10 through a pipeline.
The utility model discloses the desulfurizer particle diameter after grinding is adjusted through adjustment gradation wheel speed to mill 4 in the device, can satisfy the change of flue gas flow, sulphur content, also can practice thrift the mill power consumption simultaneously under the prerequisite that satisfies desulfurization efficiency.
Furthermore, the desulfurizing tower 10 is a desulfurizing tower with a plurality of venturi tubes, so that the flue gas flow field entering the tower is distributed uniformly. The air inlet mode of the desulfurizing tower 10 adopts a streamline bottom air inlet structure, so that the vortex generated by the collision of two air flows is avoided, and the uniform distribution of the air flow at the inlet of the desulfurizing tower is ensured.
Further, circulating fluidized tank 14 can be through adjusting the ash volume that its entrance valve aperture adjusted to get into, circulating fluidized tank 14 adopts steam to heat the fluidizing air, ensures that the desulfurization ash can not harden.
The utility model discloses a device work as follows:
the slaked lime is used as a desulphurization absorbent, the quicklime meeting the quality requirement is stored in a quicklime bin 1, enters a dry type digester 2 through a weighing and metering device, and reacts with slaked water from a water tank 6 in the dry type digester 2 to generate the slaked lime. The dry type digester 2 adopts three-stage digestion, is subjected to three-stage water distribution digestion, fully pre-digests the quicklime in a graded scientific water distribution mode, and enters a second-stage digestion reaction process after the first-stage digestion through the proportioning of the quicklime and reasonable water. At this time, the heat released from the quicklime in the secondary digester and the digestion speed are the best timing. When the second-level digestion enters the third-level digestion, the digested quicklime enters a semi-dry state. Finally, the quicklime is changed into fluffy dry powder slaked lime through three-stage digestion and is stored in the slaked lime bin 3. The quicklime bin 1 and the slaked lime bin 3 are made of steel structures, the quicklime bin and the slaked lime bin are sealed, the inner surfaces are flat and smooth, powder is not accumulated, and all inner surface welding lines are smooth.
The flue gas enters the gas inlet pipeline of the desulfurizing tower 10 from the gas inlet, and SO in the flue gas2And directly carrying out the first-step desulfurization reaction on the acid gas and the desulfurizer powder in a pipeline. The desulfurizer adopts Ca (OH)2The powder (with the particle size of 20-25 um) is uniformly sprayed in a pipeline after being ground by a desulfurizer grinding and conveying system, is fully mixed with the flue gas to generate a physical and chemical reaction, and finally part of SO in the flue gas is removed2And the like. The main reaction chemical equation is as follows:
Ca(OH)2+SO2＝CaSO3·1/2H2O+1/2H2O
Ca(OH)2+SO3＝CaSO4·1/2H2O+1/2H2O
CaSO3·1/2H2O+1/2O2＝CaSO4·1/2H2O
2Ca(OH)2+2HCl＝CaCl2·Ca(OH)2·2H2O
Ca(OH)2+2HF＝CaF2+2H2O
the unreacted desulfurizer powder enters the desulfurizing tower 10 together with the flue gas. A spray gun of water for desulfurization, namely a desulfurization water gun 9 is arranged in the desulfurization tower 10, and the water spray quantity of the desulfurization water gun 9 into the desulfurization tower 10 is controlled by measuring the temperature of the outlet of the desulfurization tower 10. The flue gas enters a fluidized bed body of the desulfurizing tower 10 after being accelerated by a Venturi tube at the lower part of the desulfurizing tower 10; the desulfurization tower with the venturi tubes is adopted, so that the flow field distribution of flue gas entering the tower is uniform, otherwise, the flow velocity difference of the venturi tubes is large, and solid particles can fall down from a certain tube. The desulfurizer is in the circulating fluidized bed, and gas-solid phases are violently turbulent and mixed under the action of airflow and fully contacted. The flue gas continuously reacts with the newly added desulfurizer, the unreacted desulfurizer powder in the previous step and cooling water in the desulfurizing tower 10, and the second step of desulfurization reaction is carried out. Finally removing most of SO in the flue gas2And the like. The main reaction chemical equation is as follows:
Ca(OH)2+SO2＝CaSO3·1/2H2O+1/2H2O
Ca(OH)2+SO3＝CaSO4·1/2H2O+1/2H2O
CaSO3·1/2H2O+1/2O2＝CaSO4·1/2H2O
Ca(OH)2+2HCl＝CaCl2·2H2O(～70℃)
2Ca(OH)2+2HCl＝CaCl2·Ca(OH)2·2H2O(>120℃)
Ca(OH)2+2HF＝CaF2+2H2O
the outlet of the desulfurizing tower 10 is connected with the inlet of the bag-type dust remover 12, and the desulfurized flue gas enters the bag-type dust remover 12 through the inlet of the bag-type dust remover 12 for dust removal. Flue gas enters a bag-type dust collector 12 from an ash bucket, a guide plate 11 is arranged at the air inlet of the ash bucket, and the guide plate 11 performs inertia pre-separation on large particles in the flue gas. Meanwhile, the guide plates 11 have the function of uniformly distributing the air flow entering the bag chamber, so that the air flow is uniformly distributed in the bag-type dust collector 12. The flue gas rises gradually along the gap of the filter bag, dust is filtered out by the filter bag, and meanwhile, the flue gas and the dust attached to the filter bag are subjected to further desulfurization reaction. And finally, the filtered smoke enters a gas purifying chamber. The air purifying chamber is a high air purifying chamber with the height of 2.5-3.5 m and is provided with a manhole, and when the filter bag needs to be overhauled or replaced, the filter bag can be directly overhauled or replaced in the air purifying chamber. Meanwhile, the arrangement mode of the high air purifying chamber can effectively avoid the problems of poor sealing, water leakage and the like of the traditional low air purifying chamber (with an access door).
The lower part of the bag-type dust collector 12 is provided with a boat-shaped dust hopper 13, and the boat-shaped dust hopper 13 is used for collecting desulfurization dust. The pressure drop of the desulfurization tower 10 is composed of a flue gas pressure drop and a solid particle pressure drop. Because the concentration of solid particles (or called solid-gas ratio) in the circulating fluidized bed is an important parameter for ensuring the good operation of the fluidized bed, the solid-gas ratio in the bed can be adjusted only by controlling the pressure drop of the desulfurizing tower during operation, so as to ensure that the reactor is always in a good operation condition. The material quantity entering the circulating fluidization groove 14 through the ship-shaped ash bucket 13 is adjusted, the recycling material quantity sent back to the desulfurizing tower 10 is controlled, and the pressure drop stability of the desulfurizing tower 10 can be ensured, so that the solid particle concentration required by the desulfurization reaction in the bed is ensured, and the utilization rate of the desulfurizing agent is increased. The rest part enters a desulfurization ash storage 15 to be treated and then is discharged.
Finally, the purified flue gas after desulfurization and dust removal is discharged through a chimney 17 under the action of an induced draft fan 16.
Because the uniform distribution of the air flow plays a vital role in dust removal, the device adopts a Computational Fluid Dynamics (CFD) method to carry out numerical simulation optimization design on the device. The numerical simulation optimization method can adopt a numerical simulation optimization design method in a patent-bag type dust collector air flow organization multi-parameter optimization method (publication number CN 105912745A).
Claims (6)
1. A front-mounted dry desulfurization CFB desulfurization device comprises a desulfurizer grinding and conveying system, a desulfurizer preparation system, a water tank (6), a desulfurization tower (10), a bag-type dust remover (12) and a circulating fluidized tank (14) which are sequentially arranged; the desulfurizer preparation system comprises a quicklime bin (1), a dry digester (2) and a slaked lime bin (3) which are sequentially arranged; the dry digester (2) is connected with the water tank (6), and a digestion water pump (7) is arranged between the dry digester (2) and the water tank (6); the method is characterized in that: the desulfurizer grinding and conveying system is positioned at a flue gas inlet pipeline and comprises a grinding machine (4), a desulfurizer uniform distribution device (5) and a pipeline connected with an inlet of a desulfurizing tower (10), wherein the grinding machine (4) in the desulfurizer grinding and conveying system grinds desulfurizer into powder and then the powder is uniformly sprayed in the pipeline through the desulfurizer uniform distribution device (5); a desulfurization water gun (9) used for providing desulfurization water is arranged in the desulfurization tower (10), a desulfurization water pump (8) is arranged at the input end of the desulfurization water gun (9), the desulfurization water pump (8) is connected with the water tank (6), the outlet of the desulfurization tower (10) is connected with the inlet of a bag-type dust remover (12), a ship-shaped dust hopper (13) is arranged at the lower part of the bag-type dust remover (12), a circulating fluidization groove (14) and a desulfurization ash storehouse (15) are arranged at the lower part of the ship-shaped dust hopper (13), and the bottom of the circulating fluidization groove (14) is connected with the desulfurization tower (10);
the bottom of the slaked lime bin (3) is provided with a first discharge port and a second discharge port, the first discharge port is connected with a feed port of a mill (4) of a desulfurizer grinding and conveying system, and the second discharge port is directly connected with a desulfurizing tower (10).
2. The CFB desulfurization apparatus for preliminary dry desulfurization according to claim 1, characterized in that: the dry digester (2) is a three-stage dry digester.
3. The CFB desulfurization apparatus for preliminary dry desulfurization according to claim 1, characterized in that: the bottoms of the lime slaking and slaking bins (1 and 3) are cones, fluidization plates are arranged on the inner surfaces of the cones, and a Roots blower is arranged to blow air to fluidize the bins.
4. The CFB desulfurization apparatus for preliminary dry desulfurization according to claim 1, characterized in that: the mill (4) comprises a grinding disc and a grading wheel.
5. The CFB desulfurization apparatus for preliminary dry desulfurization according to claim 1, characterized in that: the desulfurizing tower (10) is a desulfurizing tower adopting a plurality of venturi tubes, and the bottom of the desulfurizing tower (10) is of a streamline air inlet structure.
6. The CFB desulfurization apparatus for preliminary dry desulfurization according to claim 1, characterized in that: and a valve for adjusting the opening degree is arranged at the inlet of the circulating fluidization groove (14), and a steam heating mechanism is arranged on the circulating fluidization groove (14).
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| CN202020404545.XU CN212091673U (en) | 2020-03-24 | 2020-03-24 | Front-mounted dry desulphurization CFB desulphurization device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113926299A (en) * | 2021-11-26 | 2022-01-14 | 安徽恒夏环保科技有限公司 | Sodium-based dry desulfurization device capable of being efficiently utilized and process method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113926299A (en) * | 2021-11-26 | 2022-01-14 | 安徽恒夏环保科技有限公司 | Sodium-based dry desulfurization device capable of being efficiently utilized and process method |
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Denomination of utility model: CFB desulfurization device with pre-dry desulfurization Effective date of registration: 20230216 Granted publication date: 20201208 Pledgee: Hanshan County sub branch of Postal Savings Bank of China Ltd. Pledgor: ANHUI WEIDA ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2023980032709 |