CN202105591U - Clean smoke circulating system - Google Patents
Clean smoke circulating system Download PDFInfo
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- CN202105591U CN202105591U CN2010202754937U CN201020275493U CN202105591U CN 202105591 U CN202105591 U CN 202105591U CN 2010202754937 U CN2010202754937 U CN 2010202754937U CN 201020275493 U CN201020275493 U CN 201020275493U CN 202105591 U CN202105591 U CN 202105591U
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- flue gas
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- clean flue
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Abstract
The utility model discloses a clean smoke circulating system comprising a control system and a circulating smoke flue, wherein the circulating smoke flue is arranged between an outlet end of a draught fan and an inlet end of a desulfuration absorbing tower. The clean smoke circulating system is characterized in that a first sealing baffle door, a throttling device, an control damper and a second sealing baffle door are arranged on the circulating smoke flue in sequence, a gas manometer, a gas flowmeter and a gas thermometer are arranged between the second sealing baffle door and the control damper, the control system receives parameters output by the gas manometer, the gas flowmeter and the gas thermometer, compares and calculates the parameters and then outputs the result, and when the calculated result is equal to or smaller than the designed threshold value, the two sealing baffle doors are opened manually or automatically, or the control damper is adjusted simultaneously, and when the calculated result is larger than the design threshold value, the two sealing baffle doors are closed manually or automatically. The clean smoke circulating system can conveniently adjust the reflux quantity and the needed pressure drop of the clean smoke, and when being started, the system does not shock the normal running of a boiler and a desulfuration system.
Description
Technical field
The utility model 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 fluidized 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 fluidized, 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 utility model 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 when exhaust gas volumn significantly changes, can continue stable operation.
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, 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; The parameter of described control system receiver gases pressure gauge, gas flowmeter and gas thermometer output is also relatively calculated back output result with the former Gas Parameters of desulphurization system; When result of calculation is equal to or less than design threshold, manually or automatically open 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.
The device that the utility model provided 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.
The characteristics of the utility model are following:
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 through cycle flue, together go into tower, guaranteed to get into the exhaust gas volumn that desulphurization system sets with the former flue gas that boiler comes out; 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 fluidized 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 through 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 moved under declared working condition, its air quantity and blast reached design load, and this moment, boiler was also worked under declared working condition; Pressure drop when exhaust gas volumn and flue gas arrive the 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 under one situation, 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 through 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
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Fig. 1 is the structured flowchart of the utility model.
The specific embodiment
With reference to Fig. 1; A kind of clean flue gas recirculation system of the utility model; 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, gas thermometer 7 and the second airtight baffle door 3, the input of described control system links to each other with gas gauge 5, gas flowmeter 6 and the output of gas thermometer 7, and the output of control system links to each other with the control end that saves damper 2 with two airtight baffle doors 3.
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 ability 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, through the corresponding measuring point signal of DCS or PLC, but can control the also operation of manual control system automatically.
When the former exhaust gas volumn that gets into desulfuration absorbing tower is lower than 80% than the ratio of the rated value of design, 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; Go out to need the additional actual clean flue gas amount of returning by COMPUTER CALCULATION; 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 the explanation of the utility model, rather than to the restriction of the utility model, any utility model that does not exceed in the utility model connotation scope is created, and all falls within the protection domain of the utility model.
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), 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); The parameter of described control system's receiver gases pressure gauge (5), 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 result of calculation is equal to or less than design threshold, manually or automatically open 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. like 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 |
|---|---|---|---|
| CN2010202754937U CN202105591U (en) | 2010-07-29 | 2010-07-29 | Clean smoke circulating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202754937U CN202105591U (en) | 2010-07-29 | 2010-07-29 | Clean smoke circulating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202105591U true CN202105591U (en) | 2012-01-11 |
Family
ID=45431040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202754937U Expired - Fee Related CN202105591U (en) | 2010-07-29 | 2010-07-29 | Clean smoke circulating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202105591U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102008871A (en) * | 2010-07-29 | 2011-04-13 | 浙江博奇电力科技有限公司 | Clean flue gas circulation system |
| CN104338434A (en) * | 2013-07-26 | 2015-02-11 | 上海梅山钢铁股份有限公司 | Load-variable adjustable circulating fluidized bed desulfurizing method |
| CN107551790A (en) * | 2017-09-29 | 2018-01-09 | 江苏亿金环保科技有限公司 | A kind of urgent bypass protection system of boiler flue gas desulfurization EGR |
-
2010
- 2010-07-29 CN CN2010202754937U patent/CN202105591U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102008871A (en) * | 2010-07-29 | 2011-04-13 | 浙江博奇电力科技有限公司 | Clean flue gas circulation system |
| CN104338434A (en) * | 2013-07-26 | 2015-02-11 | 上海梅山钢铁股份有限公司 | Load-variable adjustable circulating fluidized bed desulfurizing method |
| CN107551790A (en) * | 2017-09-29 | 2018-01-09 | 江苏亿金环保科技有限公司 | A kind of urgent bypass protection system of boiler flue gas desulfurization EGR |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120111 Termination date: 20130729 |