CN1139742C - Exhaust smoke temperature program control system for power station boiler - Google Patents
Exhaust smoke temperature program control system for power station boiler Download PDFInfo
- Publication number
- CN1139742C CN1139742C CNB01126330XA CN01126330A CN1139742C CN 1139742 C CN1139742 C CN 1139742C CN B01126330X A CNB01126330X A CN B01126330XA CN 01126330 A CN01126330 A CN 01126330A CN 1139742 C CN1139742 C CN 1139742C
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- air heater
- boiler
- steam air
- program control
- temperature
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Abstract
The present invention relates to an exhaust smoke temperature program control system for boilers of power stations, which is composed of air preheater 1 for a boiler, an adjustable steam air heater 2, a drain valve 3, an electric adjusting valve 4 and a program control cabinet 5. The adjustable air heater 2 is adjusted through the electric adjusting valve, the air temperature of the outlet of the adjustable air heater is changed, and then the goal of controlling the exhaust smoke temperature of boilers of power stations is achieved. Thus, the present invention has the advantages of reduction of low-temperature radiation, enhancement of boiler efficiency and reduction of coal consumption for power generation of a machine set.
Description
Technical field
The present invention relates to the station boiler technical field, belong to the exhaust gas temperature stored program controlled specifically.
Background technology
In the at present domestic and international thermal power unit operation, exhaust gas temperature is not realized on request control automatically, and the unit that has is provided with steam air heater, and the unit that has is not provided with steam air heater, and steam air heater is also non-adjustable, and in fact exhaust gas temperature is in any variable condition.Owing to differ about 30 ℃ summer in outside air temperature winter, make the boiler inlet air themperature change significantly.Sulfur content and water content significantly change in the coal simultaneously, cause that boiler air preheater cold junction wall temperature reduces, and make cold end corrosion aggravate; Cause that perhaps exhaust gas temperature raises, boiler efficiency reduces.The former makes air preheater damage too early, influences the normal operation of boiler; The latter makes the unit generation coal consumption increase, and wastes energy.
Summary of the invention
The purpose of this invention is to provide by changing the condition of work of adjustable steam air heater heating surface, change the outlet wind-warm syndrome of adjustable steam air heater, the control exhaust gas temperature, thereby change boiler air preheater cold junction wall temperature, alleviating under the prerequisite of cold end corrosion, improve boiler efficiency, reduce a kind of exhaust smoke temperature program control system for power station boiler of unit generation coal consumption.
Technical scheme of the present invention is: when extraneous coal and temperature Change, sulfur content with coal, water content data and temperature data are input to computer, calculate the boiler air preheater cold junction minimum wall temperature of cold end corrosion requirement by software for calculation, calculate the gross coal consumption rate after extracted steam from turbine influence and exhaust gas temperature influence simultaneously, send control instruction after the best of definite adjustable steam air heater that requires outlet wind-warm syndrome thus and make the control valve auto-action, change adjustable steam air heater condensation water level, make adjustable steam air heater outlet wind-warm syndrome change, thereby realize that exhaust gas temperature is program control.Exhaust smoke temperature program control system for power station boiler with existing boiler air preheater, steam air heater, drain valve composition, by extracted steam from turbine, outdoor cold wind enters steam air heater, steam air heater outlet wind-warm syndrome is changed, it is characterized in that being arranged on the control valve and the presetting apparatus of adjustable steam air heater hydrophobic side, control to adjust the aperture of valve by program control device, thereby control exhaust gas temperature.
Description of drawings Fig. 1 is a structure chart of the present invention.
The specific embodiment
According to shown in Figure 1, exhaust smoke temperature program control system for power station boiler is by boiler air preheater 1, adjustable steam air heater 2, and drain valve 3, control valve 4 and program control cabinet 5 are formed, and are drawn gas by steam turbine 7, and outdoor cold wind 8 enters steam air heater 2, and steam air heater outlet wind-warm syndrome is changed.The invention is characterized in the control valve 4 that is arranged on adjustable steam air heater hydrophobic side,, thereby reach the temperature of controlling boiler exhaust gas 6 by the aperture of program control device 5 control and regulation valves 4.Therefore the control valve 4 of the present invention's setting is regulated adjustable steam air heater 2, changes the exchange capability of heat of adjustable steam air heater 2, reaches the purpose of control station boiler exhaust gas temperature.
The exothermic coefficient that steam condenses to tube wall is far longer than the exothermic coefficient of single-phase water to tube wall, by regulating the water level of adjustable steam air heater 2, changes steam condensation heat heat transfer area, and just can change adjustable steam air heater and exert oneself, thus change boiler export wind-warm syndrome.
When extraneous coal changes or during temperature Change, sulfur content, water content data and the temperature data of coal is input to the computer of 5 li in program control cabinet, calculate the cold junction minimum wall temperature of the boiler air preheater 1 that cold end corrosion requires by software for calculation.Calculate the gross coal consumption rate after extracted steam from turbine influence and exhaust gas temperature influence simultaneously, determine the best outlet of the adjustable steam air heater wind-warm syndrome of requirement thus, compare with measured data again.The control instruction of being sent by program control cabinet 5 makes control valve 4 auto-actions, changes the condensation water level of adjustable steam air heater 2, makes adjustable steam air heater outlet wind-warm syndrome change, thereby realizes the program control of exhaust gas temperature.Control valve 4 plays the effect of system's control.
Embodiment 1: coal changes
When sulfur content increase or moisture increase,, necessarily require the exhaust gas temperature rising because the cold junction cold end corrosion aggravation that the flue gas dew point temperature raises and makes boiler air preheater 1 prevents the cold junction wall temperature raising of cold end corrosion requirement.The data of the sulfur content of coal and water content are input to the computer of 5 li in program control cabinet, calculate the cold junction minimum wall temperature of the boiler air preheater 1 of cold end corrosion requirement, determine the best outlet of the adjustable steam air heater wind-warm syndrome that requires thus by software for calculation.The control instruction of being sent by program control cabinet 5 makes control valve 4 increase aperture automatically, reduce the condensation water level of adjustable steam air heater 2, increase exerting oneself of adjustable steam air heater 2, the outlet wind-warm syndrome of adjustable steam air heater 2 improves, the import wind-warm syndrome that is boiler improves, exhaust gas temperature raises naturally, reaches to improve boiler cold junction wall temperature, prevents the purpose of cold end corrosion.
Embodiment 2: outside air temperature raises
When summer temp is more than 30 ℃, the import wind-warm syndrome of adjustable steam air heater 2 improves, at this moment temperature data is input to the computer of 5 li in program control cabinet, calculates the extracted steam from turbine influence, determine the best outlet wind-warm syndrome of the adjustable steam air heater 2 of requirement thus by software for calculation.Sending instruction by program control cabinet 5 makes control valve 4 reduce aperture automatically, the raise condensation water level of adjustable steam air heater 2 reduces exerting oneself of adjustable steam air heater 2, and the outlet wind-warm syndrome of keeping adjustable steam air heater 2 is constant substantially, it is constant substantially to keep exhaust gas temperature, makes boiler efficiency constant substantially.Because the steam consumption quantity of adjustable steam air heater 2 reduces, extracted steam from turbine reduces, and steam turbine power increases, and the unit generation coal consumption descends, thereby reaches energy-saving effect.
Embodiment 3: when outside air temperature changed, coal also changed
This moment, the cold junction wall temperature that is calculated the boiler air preheater 1 that prevents the cold end corrosion requirement by software for calculation reached the corresponding with it exhaust gas temperature and the outlet wind-warm syndrome of adjustable steam air heater 2 with sulfur content and the data of water content and the computer that temperature data is input to 5 li in program control cabinet of coal.The comparative analysis of the outlet wind-warm syndrome of the adjustable steam air heater 2 that steam consumption quantity of keeping this outlet wind-warm syndrome correspondence simultaneously requires with above-mentioned cold end corrosion the trend that influences of unit generation coal consumption obtains the outlet wind-warm syndrome of the best adjustable steam air heater 2 that control.As setting valve, regulate with the outlet wind-warm syndrome contrast of surveying the adjustable steam air heater 2 that obtains.When actual measurement temperature is on the low side, send instruction by program control cabinet 5 and make control valve 4 increase aperture automatically, equate that until actual measurement wind-warm syndrome and best wind-warm syndrome the function of this adjusting is to prevent cold end corrosion; Otherwise, when actual measurement temperature is higher, sends instruction by program control cabinet 5 and make control valve 4 reduce aperture automatically, equate with best wind-warm syndrome that until the actual measurement wind-warm syndrome function of this adjusting is to reduce exhaust gas temperature, reduces the unit generation coal consumption, reaches purpose of energy saving.
Claims (1)
1, a kind of exhaust smoke temperature program control system for power station boiler, it is made up of boiler air preheater, steam air heater, control valve; In steam air heater, heat cold wind by extracted steam from turbine, by control valve control steam air heater outlet wind-warm syndrome is changed on request, it is characterized in that adjustable steam air heater (2) hydrophobic side is provided with control valve (4), by the aperture of program control device (5) control and regulation valves (4), change the temperature of the condensation water level control boiler exhaust gas (6) in the steam air heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01126330XA CN1139742C (en) | 2001-07-24 | 2001-07-24 | Exhaust smoke temperature program control system for power station boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01126330XA CN1139742C (en) | 2001-07-24 | 2001-07-24 | Exhaust smoke temperature program control system for power station boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1399097A CN1399097A (en) | 2003-02-26 |
| CN1139742C true CN1139742C (en) | 2004-02-25 |
Family
ID=4666351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01126330XA Expired - Fee Related CN1139742C (en) | 2001-07-24 | 2001-07-24 | Exhaust smoke temperature program control system for power station boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1139742C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846329A (en) * | 2010-06-23 | 2010-09-29 | 魏熙臣 | Draining system for steam air heater of utility boiler |
| CN102278768B (en) * | 2011-06-28 | 2013-12-04 | 高明逊 | Energy-saving optimizing control system of power station boiler steam air heater |
-
2001
- 2001-07-24 CN CNB01126330XA patent/CN1139742C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1399097A (en) | 2003-02-26 |
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |