CN102806007A - Circulating fluidized bed flue gas desulfurizating and returning device - Google Patents
Circulating fluidized bed flue gas desulfurizating and returning device Download PDFInfo
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- CN102806007A CN102806007A CN2012102756122A CN201210275612A CN102806007A CN 102806007 A CN102806007 A CN 102806007A CN 2012102756122 A CN2012102756122 A CN 2012102756122A CN 201210275612 A CN201210275612 A CN 201210275612A CN 102806007 A CN102806007 A CN 102806007A
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Abstract
The invention belongs to the technical field of dry desulphurization for flue gas, and relates to a returning device, in particular to a circulating fluidized bed flue gas desulfurating and returning device. The circulating fluidized bed flue gas desulfurating and returning device comprises a desulphurization tower, an ash hopper of an ash collector and a middle ash bin. An ash discharge outlet of the ash hopper of the ash collector is connected with the middle ash bin through a primary screw conveyor so that desulfurized ash is horizontally conveyed to the middle ash bin; the middle ash bin is connected with the desulfurization tower through a secondary screw conveyer so that most desulfurized ash in the middle ash bin is conveyed into the desulfurization tower to be subjected to reaction again; and thus, the desulfurized ash is recycled by multiple times. The ash discharge outlet of the ash hopper of the ash collector is connected with the primary screw conveyer through a buffer bend. Failures of the screw conveyor due to abrupt ash discharge are avoided by the simple structure that the ash discharge outlet of the ash hopper of the ash collector is connected with the primary screw conveyor through the buffer bend skillfully, and uniform reactions of boilers, induced draft fans and the desulfurization tower due to uniform ash discharge of the ash collector are avoided.
Description
Technical field
The invention belongs to the flue gas dry desulfurizing technical field, relate to a kind of material-returning device, a kind of specifically circulating fluid bed flue-gas desulfurizing material-returning device.
Background technology
Pernicious gases such as the sulfur dioxide in flue gas that produces when fire coal, fuel oil, combustion gas, nitrogen oxide enter atmosphere, cause acid rain, destroy ecological environment, influence the healthy of people.To the more strict control control criterion of the relevant environmental regulation of China to the permission concentration of emission proposition of sulfur dioxide in flue gas, nitrogen oxide, various flue gas desulfurization technique method and apparatus arise at the historic moment.
Coal-burning sulfur dioxide control method can be divided three classes: desulfurization and burning back desulfurization (flue gas desulfurization) in desulfurization before the burning, the burning, wherein desulfurization is considered to control SO after the smoke combustion
2Pollute valid approach.With regard to flue gas desulfurization technique, the flue gas desulfurization technique of be applied at present broad development and application mainly contains 4 kinds: humidification water activation method (LIFAC) and recirculating fluidized bed flue gas purifying technique (CFB-FGD) behind wet type limestone/gypsum absorption process (Wet-FGD), dry spraying dry decontamination technology (SDA), the in-furnace calcium spraying.
The recirculating fluidized bed flue gas purifying technique is with the Ca (OH) that adds desulfurizing tower
2SO in powder and the flue gas
2And other compositions such as SO in the flue gas
3, sour gas such as HCl, HF fully contact mixing, the atomized water that the desulfurizing tower porch sprays into reduces flue-gas temperature on the one hand, guarantees optimum reaction condition, on the other hand at Ca (OH)
2The surface of particle forms liquid phase.Ca (OH) in the desulfurizing tower
2Powder, flue gas and the moisture that sprays into fully mix under suspended state, and through excessive Ca (OH)
2Powder is repeatedly circulation in desulfurizing tower, is under 1.3～1.6 conditions at appropriate C a/S ratio, makes SO in the flue gas
2, SO
3Absorbed more fully Deng the sour gas physical efficiency, realized the efficient utilization of high-efficiency desulfurization and desulfurizing agent.
Desulfurizing agent is shorter at the desulfurization dwell time in the tower; Most of initiate desulfurizing agent gets into the back deduster with flue gas from the outlet of desulfurization top of tower; In the desulphurization ash that deduster is collected, contain a large amount of not desulfurizing agents of reflection; Need desulphurization ash be back to desulfurizing tower through a cover material-returning device and utilize again, thereby be implemented in the higher desulfuration efficiency of realization under the lower calcium sulfur ratio.More general material-returning device is to utilize air flume to combine with air-lock device at present.Such material-returning device need dispose that blower fan and heater are auxiliary blows to air flume, and each ash bucket needs the configuration ash exhauster down, and like the storehouse pump etc., this material-returning device motor is more, and power consumption is big, needs supporting special air-lock device, like star-like ash ejector etc.
The application number that the applicant proposes is 200920233508.0 utility model patent; A kind of circulating fluid bed flue-gas desulfurizing material-returning device is disclosed; But this device is during in use in the face of various operating mode; Because of suddenly descending ash to break down, grey inequality causes boiler to spiral under the deduster thereby make sometimes, and air-introduced machine and desulfurizing tower react unequal phenomenon.
Summary of the invention
Technical problem to be solved by this invention is; Overcome the shortcoming of prior art; A kind of circulating fluid bed flue-gas desulfurizing material-returning device is provided, can prevents that spiral from breaking down because of suddenly descending ash, avoid under the deduster grey inequality to cause boiler, air-introduced machine and sulphur tower reaction uneven phenomenon.
The technical scheme that the present invention solves above technical problem is:
The circulating fluid bed flue-gas desulfurizing material-returning device comprises desulfurizing tower, dust collector ash hopper and middle grey storehouse; The dust collector ash hopper dust inlet connects grey storehouse, said centre through the one-level conveying worm; With desulphurization ash horizontal feed to middle grey storehouse; Middle grey storehouse connects said desulfurizing tower through the deuterostrophies conveyer; Most of desulphurization ash in the grey storehouse, centre is delivered to reaction again in the desulfurizing tower, and so desulphurization ash is through recycled for multiple times; The dust collector ash hopper dust inlet connects the one-level conveying worm through buffer bent.
The present invention connects institute's one-level conveying worm at the dust collector ash hopper dust inlet through buffer bent cleverly, and simple structure prevents that spiral from breaking down because of suddenly descending ash, avoids that grey inequality causes that boiler, air-introduced machine and sulphur tower react uneven phenomenon under the deduster.Traditional method, ash are to rely on gravity directly to drop down onto the one-level conveying worm, and vertical pipe can not dust stratification, and when boiler or air-introduced machine parameter fluctuation, the grey quantity that falls fluctuates thereupon; After adopting elbow, the elbow second half section is because of horizontal dust stratification section plays cushioning effect, the ash fluctuation that falls that stops or reduce to cause because of boiler or air-introduced machine parameter fluctuation.
Technical scheme the applicant of the present invention further research improved making whether further on the basis of original technology; When whether the applicant can further improve ash evenly in research; There is improved space the junction of finding dust collector ash hopper dust inlet and one-level conveying worm; And then carried out Multitest; Finally found a not only simple but also practical technical scheme, promptly the dust collector ash hopper dust inlet connects the one-level conveying worm through buffer bent and can reach and prevent that spiral from breaking down because of suddenly descend ash, and the grey down uniform purpose of deduster; No matter be angle from the discovery technique problem, or technical scheme itself, creative work all paid.
The technical scheme that the present invention further limits is:
Aforesaid circulating fluid bed flue-gas desulfurizing material-returning device, the bent angle of buffer bent is for being the acute angle less than 45 ° of degree.It is stronger that such angle is provided with cushioning effect, the ash fluctuation that falls that stops or reduce to cause because of boiler or air-introduced machine parameter fluctuation.
Aforesaid circulating fluid bed flue-gas desulfurizing material-returning device, embedded deuterostrophies conveyer in the middle grey storehouse.
The invention has the beneficial effects as follows: but the ⑴ desulphurization ash can suitably reduce the requirement to the difference in height of back dust collector ash hopper and desulfurizing tower returning charge mouth through the conveying worm horizontal feed; ⑵ need not air-lock device, can reach lock gas purpose through grey storehouse, centre; ⑶ package unit has only two motors, and more traditional material-returning device saves at least three motors, thereby reaches the purpose of power and energy saving; ⑷ at least one cover ash conveying device was saved in the discharging down of grey storehouse in the middle of desulfurization ash concentrated on, and had reduced the number of devices of desulphurization system, reduced investment, was convenient to maintenance and maintenance; ⑸ meet one-level conveying worm place at the ash bucket dust inlet buffer bent be set for adapting to various operating modes, prevent spiral because of suddenly descend ash and break down and deduster under grey inequality cause boiler, air-introduced machine, desulfurizing tower react unequal phenomenon; ⑹ because shorten space length, and spatial placement is compact, more adapts to a lot of transformation projects.
Description of drawings
Fig. 1 is a connection sketch map of the present invention.
Fig. 2 is a dust collector ash hopper of the present invention and the sketch map that is connected of one-level conveying worm.
The specific embodiment
Embodiment 1
Present embodiment provides a kind of circulating fluid bed flue-gas desulfurizing material-returning device; Connect as shown in Figure 1; Comprise desulfurizing tower 1, dust collector ash hopper 2 and middle grey storehouse 3; Grey storehouse 3 in the middle of the dust inlet 6 of dust collector ash hopper 2 connects through one-level conveying worm 4, embedded deuterostrophies conveyer 5 in the middle grey storehouse 3 connects desulfurizing tower 1 through deuterostrophies conveyer 5.Dust collector ash hopper dust inlet 6 connects one-level conveying worm 4 through buffer bent 7, connects as shown in Figure 2ly, and the bent angle of buffer bent is for for less than the acute angle of 45 ° of degree.
Flue gas gets into desulfurizing tower 1; In desulfurizing tower 1, add desulfurizing agent simultaneously and carry out desulphurization reaction, unreacted desulfurizing agent mixes desulphurization ash and gets into back deduster, desulphurization ash to dust collector ash hopper 2 places that back deduster is collected together; Dust collector ash hopper 2 dust inlet places connect one-level conveying worm 4; With desulphurization ash horizontal feed to middle grey storehouse 3, embedded deuterostrophies conveyer 5 in the middle grey storehouse 3 is delivered to reaction again in the desulfurizing tower 1 with the most of desulphurization ash in the grey storehouse 3, centre; So desulphurization ash can be passed through recycled for multiple times, is issued to the purpose than high desulfurization efficiency thereby reach at lower calcium sulfur ratio.Connect institute's one-level conveying worm at the dust collector ash hopper dust inlet through buffer bent, simple structure prevents that spiral from breaking down because of suddenly descending ash, avoids that grey inequality causes that boiler, air-introduced machine and sulphur tower react uneven phenomenon under the deduster.
Except that the foregoing description, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (3)
1. the circulating fluid bed flue-gas desulfurizing material-returning device comprises desulfurizing tower, dust collector ash hopper and middle grey storehouse; Said dust collector ash hopper dust inlet connects grey storehouse, said centre through the one-level conveying worm; With desulphurization ash horizontal feed to middle grey storehouse; Grey storehouse, said centre connects said desulfurizing tower through the deuterostrophies conveyer; Most of desulphurization ash in the grey storehouse, centre is delivered to reaction again in the desulfurizing tower, and so desulphurization ash is through recycled for multiple times; It is characterized in that: said dust collector ash hopper dust inlet connects said one-level conveying worm through buffer bent.
2. circulating fluid bed flue-gas desulfurizing material-returning device as claimed in claim 1 is characterized in that: the bent angle of said buffer bent is the acute angle less than 45 ° of degree.
3. according to claim 1 or claim 2 circulating fluid bed flue-gas desulfurizing material-returning device is characterized in that: embedded deuterostrophies conveyer in the grey storehouse, said centre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102756122A CN102806007A (en) | 2012-08-03 | 2012-08-03 | Circulating fluidized bed flue gas desulfurizating and returning device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102756122A CN102806007A (en) | 2012-08-03 | 2012-08-03 | Circulating fluidized bed flue gas desulfurizating and returning device |
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| CN102806007A true CN102806007A (en) | 2012-12-05 |
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| CN2012102756122A Pending CN102806007A (en) | 2012-08-03 | 2012-08-03 | Circulating fluidized bed flue gas desulfurizating and returning device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201493051U (en) * | 2009-07-24 | 2010-06-02 | 黄震 | Flue gas desulfurization and return device for circulating fluidized bed |
| CN202011619U (en) * | 2011-04-08 | 2011-10-19 | 枣庄福源印染机械有限公司 | Mobile spiral feeding conveyer |
| CN202725022U (en) * | 2012-08-03 | 2013-02-13 | 南京龙玖环境工程有限公司 | Flue gas desulfurization returning device of circulating fluidized bed |
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2012
- 2012-08-03 CN CN2012102756122A patent/CN102806007A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201493051U (en) * | 2009-07-24 | 2010-06-02 | 黄震 | Flue gas desulfurization and return device for circulating fluidized bed |
| CN202011619U (en) * | 2011-04-08 | 2011-10-19 | 枣庄福源印染机械有限公司 | Mobile spiral feeding conveyer |
| CN202725022U (en) * | 2012-08-03 | 2013-02-13 | 南京龙玖环境工程有限公司 | Flue gas desulfurization returning device of circulating fluidized bed |
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Application publication date: 20121205 |