IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0045294
(2008-03-10)
|
등록번호 |
US-8230825
(2012-07-31)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
14 |
초록
▼
A boiler control system for efficiently controlling the operation of a packaged boiler is provided. The system includes a combustion air control system, a fuel control system, a flue gas sensing system, and a boiler controller. The boiler controller is in operative communication with the combustion
A boiler control system for efficiently controlling the operation of a packaged boiler is provided. The system includes a combustion air control system, a fuel control system, a flue gas sensing system, and a boiler controller. The boiler controller is in operative communication with the combustion air control system, fuel control system, and the flue gas sensing system. Based upon a system demand, the boiler controller controls coarse-level operation of the combustion air control system and the fuel control system. The flue gas sensing system includes an oxygen sensor and a flue gas differential sensor that senses a change in a characteristic of the flue gas. When the flue gas differential sensor senses a change in the flue gas characteristic that meets a flue gas differential setpoint, the boiler controller controls fine-level operation of the combustion air control system to efficiently control the amount of oxygen in the flue gas.
대표청구항
▼
1. A boiler control system for controlling the operation of a boiler (100), comprising: A) a combustion air control system (200) including a combustion air fan (210) for supplying combustion air to the boiler (100) and a combustion air damper (220) for controlling the amount of combustion air suppli
1. A boiler control system for controlling the operation of a boiler (100), comprising: A) a combustion air control system (200) including a combustion air fan (210) for supplying combustion air to the boiler (100) and a combustion air damper (220) for controlling the amount of combustion air supplied to the boiler (100) by the combustion air fan (210);B) a fuel control system (300) including a burner (310) for supplying fuel to the boiler (100) and a fuel valve (320) for controlling the amount of fuel supplied to the boiler (100) by the burner (310);C) a flue gas sensing system (400) including an oxygen sensor (410) and a flue gas differential sensor (420), wherein the oxygen sensor (410) senses the amount of oxygen in the flue gas leaving the boiler (100) and the flue gas differential sensor (420) senses a change in a predetermined characteristic of the flue gas associated with a change in the combustion air control system (200); andD) a boiler controller (500) having a system demand setpoint (510), a flue gas oxygen setpoint (520), and a flue gas differential setpoint (530), (i) wherein the boiler controller (500) is in operative communication with the combustion air control system (200), the fuel control system (300), and the flue gas sensing system (400), and(ii) wherein the boiler controller (500) controls coarse-level operation of the combustion air fan (210) and the fuel valve (320) based upon the system demand setpoint (510), and(iii) wherein when the flue gas differential sensor (420) has sensed a change in the flue gas predetermined characteristic that meets the flue gas differential setpoint (530) the boiler controller (500) controls the fine-level operation of the combustion air fan (210) to maintain the flue gas oxygen setpoint (520) based upon the amount of oxygen in the flue gas sensed by the oxygen sensor (410). 2. The boiler control system of claim 1, wherein the flue gas differential sensor (420) is a temperature sensor (422) measuring the temperature of the flue gas and the flue gas differential setpoint (530) is a predetermined change in flue gas temperature. 3. The boiler control system of claim 2, wherein the predetermined change in flue gas temperature is a temperature change of at least 10% and is sustained for at least 10 seconds before the flue gas oxygen level based fine-level operation of the combustion air fan (210) begins. 4. The boiler control system of claim 1, wherein the flue gas differential sensor (420) is a flowrate sensor (424) measuring the flowrate of the flue gas and the flue gas differential setpoint (530) is a predetermined change in flowrate of the flue gas. 5. The boiler control system of claim 4, wherein the predetermined change in flue gas flowrate is a flowrate change of at least 25% and is sustained for at least 10 seconds before the flue gas oxygen level based fine-level operation of the combustion air fan (210) begins. 6. The boiler control system of claim 1, wherein the flue gas differential sensor (420) is a pressure sensor (426) measuring the pressure of the flue gas and the flue gas differential setpoint (530) is a predetermined change in flue gas pressure. 7. The boiler control system of claim 6, wherein the predetermined change in flue gas pressure is a pressure change of at least 25% and is sustained for at least 10 seconds before the flue gas oxygen level based fine-level operation of the combustion air fan (210) begins. 8. The boiler control system of claim 1, wherein the flue gas differential sensor (420) is a particulate sensor (428) measuring the amount of particulate in the flue gas and the flue gas differential setpoint (530) is a predetermined change in amount of particulate in the flue gas. 9. The boiler control system of claim 1, wherein the combustion air fan (210) includes a fan speed controller (212) to vary the speed of the combustion air fan (210) to adjust the amount of combustion air supplied to the boiler (100) by the combustion air fan (210). 10. The boiler control system of claim 1, further including an auxiliary combustion air damper (230) to control the fine-level operation of the combustion air fan (210). 11. A boiler control system for controlling the operation of a boiler (100), comprising: A) a combustion air control system (200) including a combustion air fan (210) for supplying combustion air to the boiler (100) and a combustion air damper (220) and an auxiliary combustion air damper (230) for controlling the amount of combustion air supplied to the boiler (100) by the combustion air fan (210);B) a fuel control system (300) including a burner (310) for supplying fuel to the boiler (100) and a fuel valve (320) for controlling the amount of fuel supplied to the boiler (100) by the burner (310);C) a flue gas sensing system (400) including an oxygen sensor (410) and a temperature sensor (422), wherein the oxygen sensor (410) senses the amount of oxygen in the flue gas leaving the boiler (100) and the temperature sensor (422) measures the temperature of the flue gas; andD) a boiler controller (500) having a system demand setpoint (510), a flue gas oxygen setpoint (520), and a flue gas differential setpoint (530) set at a 10% change in flue gas temperature, (i) wherein the boiler controller (500) is in operative communication with the combustion air control system (200), the fuel control system (300), and the flue gas sensing system (400), and(ii) wherein the boiler controller (500) controls coarse-level operation of the combustion air fan (210) and the fuel valve (320) based upon the system demand setpoint (510), and(iii) wherein when the temperature sensor (420) has sensed a change in flue gas temperature that meets the flue gas differential setpoint (530) and the change is sustained for at least 10 seconds, the boiler controller (500) communicates with the auxiliary combustion air damper (230) to control the fine-level operation of the combustion air fan (210) to maintain the flue gas oxygen setpoint (520) based upon the amount of oxygen in the flue gas sensed by the oxygen sensor (410). 12. A boiler control system for controlling the operation of a boiler (100), comprising: A) a combustion air control system (200) including a combustion air fan (210) for supplying combustion air to the boiler (100) and a combustion air damper (220) and an auxiliary combustion air damper (230) for controlling the amount of combustion air supplied to the boiler (100) by the combustion air fan (210);B) a fuel control system (300) including a burner (310) for supplying fuel to the boiler (100) and a fuel valve (320) for controlling the amount of fuel supplied to the boiler (100) by the burner (310);C) a flue gas sensing system (400) including an oxygen sensor (410) and a flowrate sensor (424), wherein the oxygen sensor (410) senses the amount of oxygen in the flue gas leaving the boiler (100) and the flowrate sensor (422) measures the flowrate of the flue gas; andD) a boiler controller (500) having a system demand setpoint (510), a flue gas oxygen setpoint (520), and a flue gas differential setpoint (530) set at a 25% change in flue gas flowrate, (i) wherein the boiler controller (500) is in operative communication with the combustion air control system (200), the fuel control system (300), and the flue gas sensing system (400), and(ii) wherein the boiler controller (500) controls coarse-level operation of the combustion air fan (210) and the fuel valve (320) based upon the system demand setpoint (510), and(iii) wherein when the flowrate sensor (420) has sensed a change in flue gas flowrate that meets the flue gas differential setpoint (530) and the change is sustained for at least 10 seconds, the boiler controller (500) communicates with the auxiliary combustion air damper (230) to control the fine-level operation of the combustion air fan (210) to maintain the flue gas oxygen setpoint (520) based upon the amount of oxygen in the flue gas sensed by the oxygen sensor (410).
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