CN2843598Y - Smoke circulating fluidized-bed desulfurizer - Google Patents

Smoke circulating fluidized-bed desulfurizer Download PDF

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Publication number
CN2843598Y
CN2843598Y CN 200520077100 CN200520077100U CN2843598Y CN 2843598 Y CN2843598 Y CN 2843598Y CN 200520077100 CN200520077100 CN 200520077100 CN 200520077100 U CN200520077100 U CN 200520077100U CN 2843598 Y CN2843598 Y CN 2843598Y
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China
Prior art keywords
flue gas
reaction
absorption tower
tower
smoke
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Expired - Lifetime
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CN 200520077100
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Chinese (zh)
Inventor
李仁刚
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Nanjing Longyuan Environment Co Ltd
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李仁刚
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Priority to CN 200520077100 priority Critical patent/CN2843598Y/en
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Abstract

The utility model relates to a smoke desulfurizer for a circulating fluidized bed, which is the structure of a cylindrical reaction tower. The upper part of a reaction and absorption tower is provided with an outlet communicated with a dust removor, the bottom of the reaction and absorption tower is provided with an ash discharging port, and the lower part of the reacting absorption tower (1) is a smoke inlet (4) and a Venturi pipe (3) which are communicated; the upper part of the Venturi pipe (3) is provided with a dry lime slaker and a water fog spraying head (5), and smoke enters the inlet to interact with dry slaked lime powder and sprayed atomized water through the Venturi pipe; the outlet of the tower is communicated with the dust remover. The utility model is provided with a smoke recirculating pipeline (10-1) which is connected to the smoke inlet of the reaction and absorption tower from a clean smoke flue (14) outside the outlet of the reaction and absorption tower so that the utility model enhances the flow velocity of the smoke and prevents a bed from collapsing. The utility model has the advantages of high desulfurizing efficiency, little occupation area and load-variation adaptation of a large amplitude range, and is suitable for the desulfurizing modification of large machine sets as well as medium and small machine sets and old machine sets.

Description

Flue gas circulating fluidized bed desulfurizing device
One, the technical field
The utility model relates to a flue gas desulphurization unit of power plant, especially flue gas circulating fluidized bed desulphurization unit.
Second, background Art
As early as the 70 s, Lurgi, Germany, used a circulating fluidized bed for treating the tail gas of an aluminum plant and in the middle of the 80 s for treating utility boiler flue gas. The flue gas circulating fluidized bed desulfurization is based on the principle of a circulating fluidized bed, and SO in flue gas is recycled for many times through the recycling of an absorbent in a reaction tower2And gases such as HF, HCl and the like are fully contacted with the absorbent for 30min, so that the utilization rate of the absorbent is greatly improved, and when the molar ratio of Ca to S (1.2-1.5), the desulfurization rate of the process can reach 93-97 percent, which is equivalent to the high level of a wet desulfurization process.
The flue gas circulating fluidized bed adopts lime as an absorbent, and has the main advantages of simple ① system, reliable operation, low engineering investment of ②, wet 1/2-2/3, small occupied area, strong adaptability of ③ to coal types, capability of treating flue gas of low-sulfur coal and medium-sulfur coal, high utilization rate of ④ calcium, capability of achieving desulfurization efficiency equivalent to that of the wet method under the condition of low Ca/S molar ratio (1.2-1.5), no need of reheating flue gas treated by ⑤, basically no corrosion problem of the ⑥ system (comprising equipment, pipelines and the like), capability of being manufactured by carbon steel, no wastewater discharge of ⑦, and the defects that ① adopts slaked lime or lime as an absorbent, too high mass concentration of smoke dust at the outlet of the ② reaction tower, heavy load of a dust remover, ③ desulfurization product is CaSO3、CaSO1④ is generally used for treating middle and small capacity unit flue gas, and is applied to treating 300MW unit flue gas.
Third, the invention
The utility model discloses the purpose is: the utility model provides a circulating fluidized bed desulphurization unit, with lime slaking device and absorption tower combination as an organic whole, and can adapt to the load change of great range, especially be used for handling big, medium capacity unit flue gas.
The purpose of the utility model is realized like this: a flue gas desulfurization device of a circulating fluidized bed is of a cylindrical reaction tower structure, the upper part of the reaction tower is provided with an outlet communicated with a dust remover, the bottom of the reaction tower is provided with an ash residue outlet, the lower part of the tower is provided with a flue gas recirculation inlet 10-1, an absorption tower flue gas inlet 4 and a Venturi tube, the flue gas inlet 4 is communicated with the Venturi tube, the upper part of the Venturi tube is provided with a lime dry digester and a water mist spray nozzle 5, the flue gas is accelerated through a Venturi throat pipe from the inlet, so that the flue gas is uniformly distributed in the tower, and the upper part of the Venturi tube interacts with added dry slaked lime powder and sprayed atomized water. The utility model discloses lime slaker makes the system more simple, and sets up flue gas recirculation, adaptable boiler low-load operation.
The outlet is connected with an electric dust collector or a bag-type dust collector, and then passes through a shutter type separator.
The utility model discloses a working process is: the flue gas from the boiler is input into the desulfurization reaction tower through an electric dust remover and is peripheralThe equipment also comprises absorbent (quicklime powder) preparation, absorbent recycling, a dust remover and the like. The flue gas discharged from the boiler and not dedusted or dedusted for the first time enters from the lower part of the reaction tower. In order to make the flue gas uniformly distributed in the tower and prevent the material from leaking downwards under the condition of low load, the lower portion of reaction tower is equipped with a Venturi tube, and above the Venturi tube the dry slaked lime powder and atomized water are added and mixed, and the mixture is Ca (OH)2With SO in flue gas2、SO3HCl and HF react to produce CaSO4、CaSO3、CaCl2And CaF2And (3) mixing:
in addition, the flue gas contains CO2Exist, also produceThe reaction of the noodles consumes a part of Ca (OH)2
The mass concentration of the smoke dust of the desulfurized smoke gas at the outlet of the reaction tower reaches 800-3Before entering the dust remover, the desulfurization ash passes through a louver type separator, the dust removal efficiency of the louver type separator is 50%, and then the desulfurization ash enters a subsequent dust remover to be collected. The temperature of the flue gas after desulfurization and dust removal is 70-75 ℃, and the flue gas can be directly discharged from a chimney without being heated.
Compared with other CFB technologies, the flue gas circulating fluidized bed desulfurization technology of the utility model has the main characteristics that:
(1) the independent absorbent preparation system, the slaked lime bin and the slaked lime feeding and metering device are not arranged, only a small lime slaker is arranged beside the absorption tower, and the small lime slaker is arranged according to the raw smoke gas quantity and the inlet and outlet SO of the reaction tower2The feeding amount of lime is controlled by concentration, and the lime is digested by a digester and then directly enters an absorption tower.
(2) In order to ensure that the desulfurization device does not have a phenomenon of treading at low load, the desulfurization device is provided with a flue gas recirculation system, a flue is connected to the outlet of an induced draft fan and returns to the front of an absorption tower, and an air door is arranged. When the boiler operates at low load, the air door of the circulating flue is opened, part of clean flue gas returns to the front of the absorption tower, the flow rate of the flue gas required by the normal operation of the absorption tower is kept, and the desulfurization device can be normally put into operation under the working condition of 30-100% BMCR.
(3) High-concentration dust at the outlet of the desulfurizing tower is collected by adopting an electric bag combined dust remover, so that the equipment investment can be reduced on one hand, and the concentration of the dust at the outlet of the ADCF B flue gas circulating fluidized bed desulfurizing device can be ensured to be less than 50mg/Nm on the other hand3
The utility model discloses flue gas circulating fluidized bed desulphurization unit's desulfurization efficiency is high, and the construction investment is more economized, and area is less, under the condition that can satisfy high-grade lime supply and properly handle the desulfurization ash, has better development prospect, and can adapt to the load change of great range scope, both has been applicable to big unit, also is applicable to the desulfurization transformation of little unit in and old unit.
Description of the drawings
FIG. 1 is a schematic view of the structure of the present invention
The device comprises a tower 1, an ash discharge port 2, a Venturi tube 3, a flue gas inlet 4, a water mist spray head 5, a lime dry digester 6, a tower top 7, a dust remover 8, an induced draft fan 9, an air return pipe 10, a baffle door 11, a star-shaped feeder 12, a double-shaft dry digester 13, a smoke purification flue 14, a flue gas recirculation inlet 10-1, a desulfurization ash bin 15, a desulfurization ash pipeline 16, a shutter type separator 17 and a bin pump 18.
Fifth, detailed description of the invention
The circulating fluidized bed flue gas desulfurization device is a cylindrical reaction tower structure, the upper part of the reaction tower is provided with an outlet communicated with a dustremover, the bottom of the reaction tower is provided with an ash residue outlet, the lower part of the tower is provided with a flue gas inlet 4 and a Venturi tube, the flue gas inlet 4 is communicated with the Venturi tube, the upper part of the Venturi tube is provided with a lime dry digester and a water spray nozzle 5, the lime dry digester supplies materials, and the flue gas interacts with added dry slaked lime powder and sprayed atomized water through the Venturi tube from the inlet. The flue gas interacts with the dry slaked lime powder and the sprayed atomized water from the inlet through a Venturi throat, and the outlet of the tower is communicated with a dust remover.
Another embodiment is that the outlet of the tower is connected with a shutter type separator and then connected with a dust remover.
The utility model discloses lime slaker makes the system more simple, and sets up flue gas recirculation, adaptable boiler low-load operation.
The lime dry digester comprises a double-shaft dry digester, an air trough, a star-shaped feeder and the like.
The utility model discloses set up flue gas recirculation pipeline (10-1), locate to be connected to the flue gas entry of absorption tower from the outer clean cigarette flue (14) of export of tower to improve the flue gas velocity of flow, prevent the bed collapse.

Claims (3)

1. A flue gas desulfurization device of a circulating fluidized bed is of a cylindrical reaction tower structure, the upper part of a reaction absorption tower is provided with an outlet communicated with a dust remover, the bottom of the reaction absorption tower is provided with an ash residue outlet, the lower part of the reaction absorption tower (1) is provided with a flue gas inlet (4) and a Venturi tube (3), the flue gas desulfurization device is characterized in that the flue gas inlet (4) is communicated with the Venturi tube, the upper part of the Venturi tube is provided with a lime dry digester and a water mist spray nozzle (5), flue gas interacts with dry slaked lime powder and sprayed atomized water from the inlet through a Venturi tube, and the outlet of the tower is communicated with the dust remover.
2. A circulating fluidized bed flue gas desulfurization unit as defined in claim 1, wherein the outlet of the tower is connected to a louver-type separator and then to a dust collector.
3. A circulating fluidized bed flue gas desulfurization apparatus according to claim 1, characterized in that a flue gas recirculation line (10-1) is provided, which is connected to the flue gas inlet of the reaction-absorption tower from a flue gas cleaning duct (14) outside the outlet of the reaction-absorption tower.
CN 200520077100 2005-11-04 2005-11-04 Smoke circulating fluidized-bed desulfurizer Expired - Lifetime CN2843598Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200520077100 CN2843598Y (en) 2005-11-04 2005-11-04 Smoke circulating fluidized-bed desulfurizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200520077100 CN2843598Y (en) 2005-11-04 2005-11-04 Smoke circulating fluidized-bed desulfurizer

Publications (1)

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CN2843598Y true CN2843598Y (en) 2006-12-06

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010139168A1 (en) * 2009-06-03 2010-12-09 江苏博际环保工程有限公司 Digestion circulating fluidized bed flue gas desulfurization method and device
CN102806006A (en) * 2012-08-30 2012-12-05 太原重工股份有限公司 Flue gas desulfurization purifying system
CN104138698A (en) * 2014-07-23 2014-11-12 无锡红旗除尘设备有限公司 Smoke defluorination and efficient dust removal system
CN107694317A (en) * 2017-11-14 2018-02-16 遵义市贵科科技有限公司 A kind of flue gas desulfurization processing unit
CN111804131A (en) * 2020-07-30 2020-10-23 威海市正大环保设备股份有限公司 Two-stage desulfurization technology with downstream ash curtain

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010139168A1 (en) * 2009-06-03 2010-12-09 江苏博际环保工程有限公司 Digestion circulating fluidized bed flue gas desulfurization method and device
CN102806006A (en) * 2012-08-30 2012-12-05 太原重工股份有限公司 Flue gas desulfurization purifying system
CN102806006B (en) * 2012-08-30 2015-06-24 太原重工股份有限公司 Flue gas desulfurization purifying system
CN104138698A (en) * 2014-07-23 2014-11-12 无锡红旗除尘设备有限公司 Smoke defluorination and efficient dust removal system
CN107694317A (en) * 2017-11-14 2018-02-16 遵义市贵科科技有限公司 A kind of flue gas desulfurization processing unit
CN111804131A (en) * 2020-07-30 2020-10-23 威海市正大环保设备股份有限公司 Two-stage desulfurization technology with downstream ash curtain
CN111804131B (en) * 2020-07-30 2022-02-15 威海市正大环保设备股份有限公司 Downstream ash curtain two-stage desulfurization method

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ASS Succession or assignment of patent right

Owner name: NANJING LONGYUAN ENVIRONMENT CO., LTD.

Free format text: FORMER OWNER: LI RENGANG

Effective date: 20110929

C41 Transfer of patent application or patent right or utility model
COR Change of bibliographic data

Free format text: CORRECT: ADDRESS; FROM: 210008 NANJING, JIANGSU PROVINCE TO: 210012 NANJING, JIANGSU PROVINCE

TR01 Transfer of patent right

Effective date of registration: 20110929

Address after: 210012 No. 10-2 Yuhua South Road, Yuhuatai District, Jiangsu, Nanjing

Patentee after: Nanjing Longyuan Environment Co., Ltd.

Address before: 210008 1807 Tianfeng Hotel, 26 North Hongwu Road, Jiangsu, Nanjing

Patentee before: Li Rengang

CX01 Expiry of patent term

Granted publication date: 20061206

EXPY Termination of patent right or utility model