IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0759805
(2007-06-07)
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등록번호 |
US-8104283
(2012-01-31)
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발명자
/ 주소 |
- Cheng, Xu
- Menten, Charles H.
- Kephart, Richard W.
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출원인 / 주소 |
- Emerson Process Management Power & Water Solutions, Inc.
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대리인 / 주소 |
Marshall, Gerstein & Borun LLP
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인용정보 |
피인용 횟수 :
2 인용 특허 :
6 |
초록
▼
A technique of controlling a boiler system such as that used in a power generation plant includes using manipulated variables associated with or control inputs to a reheater section of the boiler system to control the operation of the furnace, and in particular to control the fuel/air mixture provid
A technique of controlling a boiler system such as that used in a power generation plant includes using manipulated variables associated with or control inputs to a reheater section of the boiler system to control the operation of the furnace, and in particular to control the fuel/air mixture provided to the furnace or the fuel to feedwater ratio used in the furnace or boiler. In the case of a once-through boiler type of boiler system, using the burner tilt position, damper position or reheater spray amount to control the fuel/air mixture or the fuel to feedwater flow ratio of the system provides better unit operational efficiency.
대표청구항
▼
1. A method of controlling a steam generating boiler system having a furnace, a superheater section and a reheater section, comprising: obtaining, at a controller, a first signal, the first signal being indicative of a desired value of: a reheater control variable, ora reheater manipulated variable,
1. A method of controlling a steam generating boiler system having a furnace, a superheater section and a reheater section, comprising: obtaining, at a controller, a first signal, the first signal being indicative of a desired value of: a reheater control variable, ora reheater manipulated variable,and the first signal being not indicative of a superheater spray setpoint;obtaining, at the controller, a second signal indicative of an actual value of: the reheater control variable, orthe reheater manipulated variable;using the first signal in conjunction with the second signal to generate, by the controller, a third signal; andusing the third signal in conjunction with a signal indicative of a firing rate to generate, by the controller, a fourth signal to control: a fuel feedwater ratio of the furnace and a boiler of the steam generating boiler system,a fuel/air mixture provided to the furnace, oran amount, a quanity or a type of fuel,to thereby control a steam temperature generated by the superheater section. 2. The method of controlling a steam generating boiler system of claim 1, wherein obtaining the first signal includes obtaining a signal indicative of a furnace burner tilt position. 3. The method of controlling a steam generating boiler system of claim 1, wherein obtaining the first signal includes obtaining a signal indicative of a damper position. 4. The method of controlling a steam generating boiler system of claim 3, wherein the signal indicative of a damper position comprises a signal indicative of a damper position in the reheater section of the boiler. 5. The method of controlling a steam generating boiler system of claim 1, wherein using the first signal in conjuction with the second signal includes comparing the first signal with the second signal and using a difference between the first signal and the second signal to generate the third signal. 6. The method of controlling a steam generating boiler system of claim 1, wherein using the fourth signal to control the fuel/air mixture provided to the furnace includes varying fuel/air mixture provided to the furnace to operate the furnace based on changes in the fourth signal. 7. The method of controlling a steam generating boiler system of claim 1, wherein using the fourth signal to control the fuel to feedwater ratio of the furnace and the boiler includes varying the fuel to feedwater ratio used in the furnace and the boiler based on changes in the fourth signal. 8. The method of controlling a steam generating boiler system of claim 1, wherein obtaining the first signal includes obtaining a signal indicative of a once-through boiler reheater manipulated variable used to control steam temperature in a once-through reheater section. 9. The method of controlling a steam generating boiler system of claim 1, wherein: using the first signal in conjunction with the second signal to generate the third signal includes using a first proportional-integral-derivative control routine to generate the third signal based on the first signal and the second signal; andusing the third signal in conjunction with the signal indicative of the firing rate to generate the fourth signal includes using a second proportional-integral-derivative control routine to generate the fourth signal based on the third signal and the signal indicative of the firing rate. 10. The method of controlling a steam generating boiler system of claim 1, wherein: using the first signal in conjunction with the second signal to generate the third signal includes using a first multiple-input/multiple-output control routine to generate the third signal based on the first signal and the second signal; andusing the third signal in conjunction with the signal indicative of the firing rate to generate the fourth signal includes using a second multiple-input/multiple-output control routine to generate the fourth signal based on the third signal and the signal indicative of the firing rate. 11. The method of controlling a steam generating boiler system of claim 1, wherein: using the first signal in conjunction with the second signal to generate the third signal includes using a first multiple-input/single-output control routine to generate the third signal based on the first signal and the second signal; andusing the third signal in conjunction with the signal indicative of the firing rate to generate the fourth signal includes using a second multiple-input/single-output control routine to generate the fourth signal based on the third signal and the signal indicative of the firing rate. 12. A controller unit for use in a steam generating boiler system having a boiler with a furnace, a superheater section and a reheater section, the controller unit comprising: a first input to receive a setpoint corresponding to at least one of a reheater steam temperature control variable or a reheater steam temperature manipulated variable, wherein the setpoint does not correspond to a superheater spray;a second input to receive a signal indicative of an actual value of the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable; a control routine that uses the signal indicative of the actual value of the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable and the setpoint associated with the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable to develop a first signal, and that uses the first signal indicative of a firing rate to develop a control signal; andan output to provide the control signal to the furnace to control: a fuel to feedwater ratio of the furnace and a boiler of the steam generating boiler system,a fuel/air mixture provided to the furnace, oran amount, a quantity or a type of fuel,thereby controlling a steam temperature generated by the superheater section. 13. The controller unit of claim 12, wherein the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable is indicative of a burner tilt position in the furnace. 14. The controller unit of claim 12, wherein the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable is indicative of a damper position of a damper in the boiler. 15. The controller unit of claim 12 wherein the control routine compares the actual value of the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable with the setpoint and uses a difference between the actual value of the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable and the setpoint to develop the first signal. 16. The controller unit of claim 12, wherein the control signal developed at the output operates to vary the fuel/air mixture provided to the furnace to operate the furnace based on changes in the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable. 17. The controller unit of claim 12, wherein the control signal developed at the output operates to vary the fuel to feedwater ratio used in the furnace and the boiler to operate the furnace based on changes in the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable. 18. The controller unit of claim 12, wherein the control routine implements a proportional-integral-derivative control routine to generate the control signal. 19. The controller unit of claim 12, wherein the control routine implements a multiple-input/multiple-output control routine to generate the control signal. 20. The controller unit of claim 12, wherein the control routine implements a multiple-input/single-output control routine to generate the control signal. 21. A steam generating boiler system, comprising: a boiler having a furnace, a superheater section and a reheater section coupled to the superheater section; anda controller communicatively coupled to the boiler to control operation of the boiler, the controller being communicatively connected to the reheater section to receive a signal, the signal being indicative of a desired value of at least one of a reheater steam temperature control variable or a reheater steam temperature manipulated variable, and the signal being not indicative of a superheater spray setpoint and the controller including:a first routine that uses the signal indicative of the desired value of the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable to produce a first signal, anda second routine that uses the first signal and a second signal indicative of a firing rate to generate a control signal to be used to control: a fuel to feedwater ratio of the furnace and a boiler of the steam generating boiler system,a fuel/air mixture provided to the furnace, oran amount, a quantity or a type of fuel,thereby controlling a steam temperature generated by the superheater section. 22. The steam generating boiler system of claim 21, wherein the boiler includes one or more dampers for directing flow of gas through the superheater section and the reheater section and wherein the signal indicative of the desired value of the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable is indicative of a desired position of the one or more dampers. 23. The steam generating boiler system of claim 21, wherein the furnace includes one or more tiltable burners for effecting a temperature of gas in the superheater section and the reheater section and the desired value of the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable is indicative of a desired tilt position of the one or more tiltable burners. 24. The steam generating boiler system of claim 21, wherein the boiler is a once-through boiler. 25. The steam generating boiler system of claim 21, further including a reheater spray unit for controlling steam temperature at an output of the reheater section and wherein the controller includes a further control routine for controlling an operation of the reheater spray unit. 26. The steam generating boiler system of claim 25, further including a superheater spray unit for controlling steam temperature at an output of the superheater section and wherein the controller includes a further control routine for controlling an operation of the superheater spray unit. 27. The steam generating boiler system of claim 21, further including a superheater spray unit for controlling steam temperature at an output of the superheater section and wherein the controller includes a further control routine for controlling an operation of the superheater spray unit. 28. The steam generating boiler system of claim 21, wherein the control routine is a proportional-integral-derivative control routine. 29. The steam generating boiler system of claim 21, wherein the control routine is a multiple-input/multiple-output control routine. 30. The steam generating boiler system of claim 21, wherein the control routine is a multiple-input/single-output control routine. 31. A once-through boiler system, comprising: a furnace;a superheater section;a first turbine coupled to the output of the superheater section;a reheater section coupled to the first turbine;a second turbine coupled to the output of the reheater section; anda controller to control operation of the furnace, the controller being communicatively connected to the reheater section to receive a first signal, the first signal being indicative of a desired value of one of a reheater steam temperature control variable or a reheater steam temperature manipulated variable, and the first signal being not indicative of a superheater spray setpoint and the controller including:a first routine that uses the first signal and a second signal indicative of an actual value of the one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable indicative of the reheater steam temperature control or manipulated variable to produce a third signal; anda second routine that uses the third signal and a signal indicative of a firing rate to produce a control signal, the control signal to be used to control: a fuel to feedwater ratio of the furnace and a boiler of the steam generating boiler system,a fuel/air mixture provided to the furnace, oran amount, a quantity or a type of fuel,thereby controlling a steam temperature at the output of the superheater section. 32. The once-through boiler system of claim 31, further including one or more dampers for directing flow of gas through the superheater section and the reheater section and wherein one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable is indicative of a position of the one or more dampers. 33. The once-through boiler system of claim 31, wherein the furnace includes one or more tiltable burners for effecting the temperature of gas in the superheater section and the reheater section and wherein the one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable is indicative of a tilt position of the one or more tiltable burners. 34. The method of controlling a steam generating boiler system of claim 1: wherein the first signal is indicative of the desired value of the reheater manipulated variable;the method further comprises obtaining, at the controller, a fifth signal indicative of the reheater control variable used in the reheater section; andwherein using the first signal in conjunction with the second signal to generate the third signal comprises using the first signal and the fifth signal in conjunction with the second signal to generate the third signal. 35. A controller unit of claim 12, wherein the signal indicative of the actual value of the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable is a signal indicative of the actual value of the reheater steam temperature manipulated variable, and the controller unit further comprises: a third input to receive a signal indicative of the actual value of the reheater steam temperature control variable used in steam temperature control of the reheater section; anda fourth input to receive a setpoint associated with the reheater steam temperature control variable,wherein the control routine uses the signal indicative of the actual value of the reheater steam temperature control variable, the setpoint associated with the reheater steam temperature control variable, the signal indicative of the actual value of the reheater steam temperature manipulated variable, and the setpoint associated with the reheater steam temperature manipulated variable to develop the control signal. 36. The steam generating boiler system of claim 21, wherein: the signal indicative of the desired value of the at least one of the reheater steam temperature control variable or the reheater steam temperature manipulated variable is a signal indicative of the desired value of the reheater steam temperature manipulated variable,the controller is communicatively connected to the reheater section to further receive a signal indicative of the desired value of the reheater steam temperature control variable, andthe routine included in the controller uses the signal indicative of the desired value of the reheater steam temperature control variable and the signal indicative of the desired value of the reheater steam temperature manipulated variable to produce the first signal. 37. The once-through boiler system of claim 31, wherein: the first signal is indicative of the desired value of the reheater steam temperature manipulated variable,the controller is communicatively connected to the reheater section to further receive a fourth signal indicative of the desired value of the reheater steam temperature control variable, andthe routine included in the controller uses the first signal, the second signal, indicative of the reheater steam temperature control variable and the fourth signal indicative of the reheater steam temperature manipulated variable to produce the third signal to be used to control the fuel to feedwater ratio, the fuel/air mixture, or the amount, the quantity or the type of fuel.
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