CN102008871A - Clean flue gas circulation system - Google Patents
Clean flue gas circulation system Download PDFInfo
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- CN102008871A CN102008871A CN 201010240068 CN201010240068A CN102008871A CN 102008871 A CN102008871 A CN 102008871A CN 201010240068 CN201010240068 CN 201010240068 CN 201010240068 A CN201010240068 A CN 201010240068A CN 102008871 A CN102008871 A CN 102008871A
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- flue gas
- clean flue
- gas
- airtight baffle
- gas recirculation
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Abstract
The invention discloses a clean flue gas circulation system consisting of a control system and a circulation flue, wherein the circulation flue is arranged between the outlet end of a draft fan and the inlet end of a desulfuration absorption tower. The clean flue gas circulation system is characterized in that a first airtight baffle door, a throttling device, an air damper and a second airtight baffle door are arranged on the circulation flue in sequence, a gas pressure gear, a gas flowmeter and a gas thermometer are arranged between the second airtight baffle door and the air damper, and the control system receives parameters output by the gas pressure meter, the gas flowmeter and the gas thermometer and outputs a result after comparison and calculation; when the calculation result is equal to or lower than a design threshold value, the two airtight baffle doors are opened manually or automatically or the air damper is adjusted at the same time; and when the calculation result is higher than the design threshold value, the two airtight baffle doors are closed manually or automatically. By using the clean flue gas circulation system provided in the invention, clean flue gas reflux quantity and required pressure drop can be adjusted conveniently, and the normal operation of a boil and a desulfuration system is not influenced during the starting or the stop of the system.
Description
Technical field
The present invention relates to the flue gas desulfurization technique field, particularly a kind of circulating fluid bed semi-drying method flue gas desulfurization technology and clean smoke backflow technology, specifically a kind of clean flue gas recirculation system.
Background technology
In the boiler flue gas desulfurization process technology, circulating fluid bed semi-drying method flue gas desulfurization technology has many advantages: desulfuration efficiency 〉=90%; No waste water produces; No acid corrosion, the building of desulfurizer, equipment need not anticorrosion; Surrounding environment is good, is therefore extensively adopted by numerous big-and-middle-sized steam power plants and Industrial Boiler institute.
But circulating fluid bed semi-drying method desulfurizer, because its inherent operation principle, fluidized state is relatively more responsive to the change of going into the tower flue gas amount in the desulfuration absorbing tower, go into tower flue gas amount off-design exhaust gas volumn when big in the tower fluidisation attitude can change, make the desulphurization system can not stable operation, sometimes even the bed that collapses.And boiler is the phenomenon that often has owing to the variation of loading causes exhaust gas volumn significantly to change.Thereby a clean flue gas recirculation flue generally is set, the clean flue gas that comes out from air-introduced machine returns a part and replenishes tower, makes into the tower flue gas amount approachingly with the design exhaust gas volumn, keeps normal fluidisation attitude, reaches aim of stable operation.
Because the clean flue gas recirculation system that adopts at present, be provided with simply, can't effectively control the clean flue gas amount of returning, also can influence boiler sometimes and normally move, therefore often with clean flue gas recirculation system closing need not, perform practically no function.
Summary of the invention
The present invention will solve is the problems referred to above that prior art exists, and aims to provide a kind of novel clean flue gas recirculation system, can effectively and easily control the clean flue gas amount of returning, and makes desulphurization system can continue stable operation when exhaust gas volumn significantly changes.
The technical scheme that addresses the above problem employing is: a kind of clean flue gas recirculation system, comprise control system and cycle flue, described cycle flue is arranged between the port of export and desulfuration absorbing tower arrival end of air-introduced machine, it is characterized in that on described cycle flue, being provided with successively the first airtight baffle door, throttling arrangement, the damper and the second airtight baffle door, between the second airtight baffle door and damper, be provided with gas gauge, gas flowmeter and gas thermometer, described control system receiver gases pressure gauge, the parameter of gas flowmeter and gas thermometer output is also relatively calculated the back with the former Gas Parameters of desulphurization system and is exported the result, when being equal to or less than design threshold, result of calculation manually or automatically opens two airtight baffle doors, or regulate damper simultaneously, and when result of calculation is higher than design threshold, manually or automatically close two airtight baffle doors.
Device provided by the present invention can be regulated clean smoke backflow amount and required pressure drop easily, does not impact the normal operation of boiler and desulphurization system during system start and stop.
Characteristics of the present invention are as follows:
1. be discharged to from the desulphurization system air-introduced machine and extract a part the clean flue gas of chimney out, turn back to the desulfuration absorbing tower porch by cycle flue, together go into tower with the former flue gas that boiler comes out, guaranteed to enter the exhaust gas volumn that desulphurization system sets, the former exhaust gas volumn of coming out when boiler reduces, then add clean smoke backflow amount, the exhaust gas volumn that remains desulfuration absorbing tower into is constant, and the fluidisation attitude is moved under nominal situation.
2. the clean flue gas that air-introduced machine is come out, the power that turns back to desulfuration absorbing tower are due to the negative pressure of air-introduced machine itself, and condition is that air-introduced machine operates in the setting operating mode all the time, and the change with the boiler smoke amount does not change operating condition.
3. the amount of returning of clean flue gas can be decided according to the specified exhaust gas volumn of design and the difference of the former exhaust gas volumn of boiler.
4. controlling what method of the clean flue gas amount of returning is the pressure drop of control cycle flue system, and the unlatching size by damper in the cycle flue system reaches required pressure drop, thereby the clean flue gas amount of returning what are regulated.
5. when air-introduced machine moves under declared working condition, its air quantity and blast reach design load, this moment, boiler was also worked under declared working condition, pressure drop when exhaust gas volumn and flue gas arrive flue before the desulfuration absorbing tower also is in design load, when if boiler load significantly reduces, its exhaust gas volumn also reduces thereupon, and the flue gas pressure drop that is reflected in this moment before the desulfuration absorbing tower also reduces thereupon, can regulate air-introduced machine immediately generally speaking, make it coupling.Open clean flue gas recirculation system if do not regulate air-introduced machine, then can come the indirect control system overall presure drop by regulating the backflow exhaust gas volumn, thereby it is constant that the air-introduced machine inlet pressure is remained, system moves continually and steadily.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a structured flowchart of the present invention.
The specific embodiment
With reference to Fig. 1, a kind of clean flue gas recirculation of the present invention system, comprise control system and cycle flue 4, described cycle flue 4 is arranged between the port of export and desulfuration absorbing tower arrival end of air-introduced machine, it is characterized in that on described cycle flue 4, being provided with successively the first airtight baffle door 3, throttling arrangement 1, damper 2, gas flowmeter 6, gas gauge 5, the gas thermometer 7 and the second airtight baffle door 3, the input of described control system and gas gauge 5, gas flowmeter 6 links to each other with the output of gas thermometer 7, and the output of control system links to each other with the control end of two airtight baffle doors 3 with joint damper 2.
Described throttling arrangement 1 is circular orifice or venturi throttling arrangement, plays the throttling damping action when opening in clean flue gas recirculation system, does not make clean exhaust gas volumn moment of returning excessive, influences boiler operatiopn.
The section of described cycle flue 4 can be circle or rectangle.
Described damper 2 is single shaft or twin shaft louvre window, and Starting mode can be electronic or pneumatic.Change the keying angle of damper 2 blades, regulate the clean flue gas amount of returning, control required pressure drop.
Described two airtight baffle doors 3 are the baffle door that has the leak free energy fast opening and closing of seal fan, and Starting mode can be electronic or pneumatic.Airtight baffle door 3 plays the keying effect of clean flue gas recirculation system, system not the time spent keep system airtight, do not make the clean flue gas desulphurization system of bleeding.
Described control system is PLC or DCS control system, by the corresponding measuring point signal of DCS or PLC, but can control the also operation of manual control system automatically.
The ratio that compares the rated value of design when the former exhaust gas volumn that enters desulfuration absorbing tower is lower than 80%, and clean flue gas recirculation return-flow system promptly can start automatically, or reports to the police by manually starting;
The adjusting of the clean flue gas amount of returning is according to the temperature of clean flue gas and the temperature and the mixed gas temperature of former flue gas, calculate the additional actual clean flue gas amount of returning that needs by computer, control to adjust air door 2 then, come Correction and Control damper 2 from the parameter signal of gas flowmeter 6 and the difference between the required clean flue gas amount of returning, make it reach the required clean flue gas amount of returning.Whether reach the required clean flue gas amount of returning, also can obtain proofreading and correct the pressure gauge in desulfuration absorbing tower.
What should be understood that is: the foregoing description is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the connotation scope of the present invention all fall within protection scope of the present invention.
Claims (8)
1. clean flue gas recirculation system, comprise control system and cycle flue (4), described cycle flue (4) is arranged between the port of export and desulfuration absorbing tower arrival end of air-introduced machine, it is characterized in that on described cycle flue (4), being provided with successively the first airtight baffle door (3), throttling arrangement (1), the damper (2) and the second airtight baffle door (3), between the second airtight baffle door (3) and damper (2), be provided with gas gauge (5), gas flowmeter (6) and gas thermometer (7), described control system receiver gases pressure gauge (5), the parameter of gas flowmeter (6) and gas thermometer (7) output is also relatively calculated the back with the former Gas Parameters of desulphurization system and is exported the result, when being equal to or less than design threshold, result of calculation manually or automatically opens two airtight baffle doors (3), or regulate damper (2) simultaneously, and when result of calculation is higher than design threshold, manually or automatically close two airtight baffle doors (3).
2. a kind of clean flue gas recirculation as claimed in claim 1 system is characterized in that described throttling arrangement (1) is circular orifice or venturi throttling arrangement.
3. a kind of clean flue gas recirculation as claimed in claim 1 system, the section that it is characterized in that described cycle flue (4) is circle or rectangle.
4. a kind of clean flue gas recirculation as claimed in claim 1 system is characterized in that described damper (2) is single shaft or twin shaft louvre window.
5. a kind of clean flue gas recirculation as claimed in claim 1 system is characterized in that described two airtight baffle doors (3) are for having the leak free baffle door that can fast opening and closing of seal fan.
6. a kind of clean flue gas recirculation as claimed in claim 1 system is characterized in that described two airtight baffle doors (3) and damper (2) are electronic or pneumatic structure.
7. as any one described a kind of clean flue gas recirculation system of claim 1-6, it is characterized in that described design threshold is that the ratio of actual exhaust gas volumn and the exhaust gas volumn of design of boiler output is 80%.
8. a kind of clean flue gas recirculation as claimed in claim 1 system is characterized in that described control system is PLC or DCS control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010240068 CN102008871A (en) | 2010-07-29 | 2010-07-29 | Clean flue gas circulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010240068 CN102008871A (en) | 2010-07-29 | 2010-07-29 | Clean flue gas circulation system |
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| Publication Number | Publication Date |
|---|---|
| CN102008871A true CN102008871A (en) | 2011-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010240068 Pending CN102008871A (en) | 2010-07-29 | 2010-07-29 | Clean flue gas circulation system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106292747A (en) * | 2016-08-30 | 2017-01-04 | 湖南循安环境资源技术有限公司 | A kind of self-loopa adjusting means for atmosphere pollution processing equipment and self-loopa control method |
| CN110081422A (en) * | 2019-05-13 | 2019-08-02 | 中国华能集团清洁能源技术研究院有限公司 | A kind of smoke circulating system and method for circulating fluidized bed boiler |
| CN110585896A (en) * | 2019-10-30 | 2019-12-20 | 苏州仕净环保科技股份有限公司 | Dry-type desulfurization system for ship exhaust gas |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202105591U (en) * | 2010-07-29 | 2012-01-11 | 浙江博奇电力科技有限公司 | Clean smoke circulating system |
-
2010
- 2010-07-29 CN CN 201010240068 patent/CN102008871A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202105591U (en) * | 2010-07-29 | 2012-01-11 | 浙江博奇电力科技有限公司 | Clean smoke circulating system |
Non-Patent Citations (1)
| Title |
|---|
| 《广东科技》 20090430 陈才要 脱硫烟气旁路挡板的特点分析与控制方案设计 203-204页 1-8 , 第210期 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106292747A (en) * | 2016-08-30 | 2017-01-04 | 湖南循安环境资源技术有限公司 | A kind of self-loopa adjusting means for atmosphere pollution processing equipment and self-loopa control method |
| CN110081422A (en) * | 2019-05-13 | 2019-08-02 | 中国华能集团清洁能源技术研究院有限公司 | A kind of smoke circulating system and method for circulating fluidized bed boiler |
| CN110585896A (en) * | 2019-10-30 | 2019-12-20 | 苏州仕净环保科技股份有限公司 | Dry-type desulfurization system for ship exhaust gas |
| CN110585896B (en) * | 2019-10-30 | 2024-02-13 | 苏州仕净科技股份有限公司 | Ship exhaust gas dry desulfurization system |
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Application publication date: 20110413 |