Integrated gasification combined cycle and the control method
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0915287
(2006-01-18)
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등록번호 |
US-7832191
(2011-01-16)
|
우선권정보 |
JP-2005-162585(2005-06-02) |
국제출원번호 |
PCT/JP2006/300596
(2006-01-18)
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§371/§102 date |
20071121
(20071121)
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국제공개번호 |
WO06/129398
(2006-12-07)
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발명자
/ 주소 |
- Osakabe, Michihiro
- Kozaki, Yasuo
- Tanaka, Hideaki
- Mishima, Shunsuke
- Furusako, Tatsuo
- Shoumura, Kazuyuki
- Saisu, Takumi
- Miyata, Hiroyuki
- Watanabe, Kotaro
|
출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
2 인용 특허 :
1 |
초록
▼
A gasification unit provided with a gasification furnace 23 to produce fuel gas production is provided. A combined power generation unit 25 which generates power by rotating a gas turbine and a steam turbine using fuel gas produced in the gasification unit is provided. The combined power generation
A gasification unit provided with a gasification furnace 23 to produce fuel gas production is provided. A combined power generation unit 25 which generates power by rotating a gas turbine and a steam turbine using fuel gas produced in the gasification unit is provided. The combined power generation unit 25 is made operable while fuel change over between fuel gas and an auxiliary fuel as the fuel. A control system is provided in which the degree of opening of a control valve 37 for a flare stack 28 provided in a fuel gas feed line is controlled depending upon the pressure of the fuel gas from the gasification unit when fuel change over from the fuel gas to the auxiliary fuel so as to allow the fuel gas supplied to the combined power generation unit 25 to gradually flare from a flare stack 28 until a flared status that total amount of the fuel gas is reached.
대표청구항
▼
The invention claimed is: 1. An integrated gasification combined cycle provided with a gasification unit and a combined power generation unit that uses a gas produced in the gasification unit as a fuel and generates power by rotating a gas turbine and a steam turbine using a fuel gas produced in th
The invention claimed is: 1. An integrated gasification combined cycle provided with a gasification unit and a combined power generation unit that uses a gas produced in the gasification unit as a fuel and generates power by rotating a gas turbine and a steam turbine using a fuel gas produced in the gasification unit, in the combined power generation unit comprising: a power load control system that controls the combined power generation unit so that the power generation output corresponds to a power load request; a gasification furnace load control system that controls the gasification unit so as to produce fuel gas with a production rate corresponding to the power load request; an auxiliary fuel supply device capable of supplying an auxiliary fuel instead of the fuel gas; a flare stack which is connected to a fuel gas feed line and emits the fuel gas as a flare when the pressure of the fuel gas becomes a predetermined pressure or more; and a flare valve that controls a flaring amount emitting from said flare stack and a control system thereof; wherein the integrated gasification combined cycle enables a fuel change over operation from the fuel gas to the auxiliary fuel and from the auxiliary fuel to the fuel gas; in the fuel change over operation, the control system of the flare valve has a dead time compensation circuit that compensates a dead time and a control delay of the gasification unit and the gasification furnace load control system that controls the operation of the gasification unit uses a request of the degree of opening for said flare valve as an advanced signal. 2. The integrated gasification combined cycle according to claim 1, wherein the control system for the flare valve includes a switching device that switches a control signal passing through said dead time compensation circuit of the control system to valid or invalid. 3. A control method for an integrated gasification combined cycle provided with a gasification unit and a combined power generation unit that uses a gas produced in the gasification unit as a fuel and generates power by rotating a gas turbine and a steam turbine using a fuel gas produced in the gasification unit, in the combined power generation unit comprising, the control method comprising the steps of: controlling the combined power generation unit using a power load control system so that the power generation output corresponds to a power load request; controlling the gasification unit using a gasification furnace load control system so as to produce fuel gas with a production rate corresponding to the power load request; and controlling a flaring amount emitted from a flare stack using a flare valve, the flare stack being connected to a fuel gas feed line and capable of emitting the fuel gas as a flare when a pressure of the fuel gas reaches a predetermined pressure or more; performing a fuel change over operation of the integrated gasification combined cycle from the fuel gas to the auxiliary fuel and from the auxiliary fuel to the fuel gas; in the fuel change over operation, controlling the flare valve by a signal compensating a dead time and a control delay of the gasification unit, and sending a request for the degree of opening of the flare valve to said gasification furnace load control system that controls the operation of the gasification unit as advanced signal. 4. The control method of the integrated gasification combined cycle according to claim 3, wherein, the fuel change over operation (A) from the fuel gas to the auxiliary fuel in said fuel change over operation comprises: (1) normal operation A1: adding a signal from the power load control system to a signal from a control system that controls the pressure of the fuel gas produced in the gasification unit, and sending to the gasification furnace load control system in order to operate the gasification unit, as well as operating the flare valve for the flare stack in an automatic mode by a signal from the gas pressure control system for the flare valve, so as to supply a total amount of the fuel gas produced by operating the gasification unit corresponding to the power load request; (2) fuel change over operation A2: switching the gas pressure control system for the flare valve from the automatic mode to a manual mode, so as to control the flare valve by the signal compensating the dead time and the control delay of the gasification unit, as well as sending a signal of the degree of opening of the flare valve as the advanced signal to the gasification furnace load control system, so as to gradually increase the operation load of the gasification unit from zero flared to a level of minimum flared; (3) fuel change over operation A3-1: canceling sending of a the signal, which is the addition of signals from the gas pressure control system and the power load control system, to the gasification furnace load control system and sending the signal of the degree of opening of the flare valve, so as to keep the load of the gasification furnace load control system at a fixed level, as well as returning the control of the gas pressure control system for the flare valve to the automatic mode, cancelling the signal compensating the dead time and the control delay of the gasification unit, and controlling the flare valve by a signal, which is an addition of signals from the gas pressure control system for flare valve and the power load control system; (4) fuel change over operation A3-2: continuing the same status of the fuel change over operation A3-1 regarding the flare valve control, while supplying the combined power generation unit with the fuel gas and the auxiliary fuel so that the total amount thereof becomes an equivalent amount corresponding to the power load request, gradually change over the fuel gas from 100% to zero and the auxiliary fuel from zero to 100%; (5) fuel change over operation A4: operating in the same manner as that of the fuel change over operation A3-2 except that, after fuel change over the fuel gas to the 100% auxiliary fuel, the signal from the power load control system to the gas pressure control system for flare valve is cancelled and the flare valve control is performed only by the signal from the gas pressure control system for flare valve, so as to operate to stop the operation of the gasification unit after a predetermined time. 5. The control method of the integrated gasification combined cycle according to claim 3, wherein, in said fuel switching operation, the fuel change over operation (B) from the auxiliary fuel to the fuel gas comprises: (1) auxiliary fuel operation B1: supplying the combined power generation unit with auxiliary fuel of an equivalent amount corresponding to the power load request, while ahead of starting the gasification unit so as to be capable of change over to the fuel gas to operate at a fixed load, and the flare valve is operated only by the signal from the gas pressure control system for flare valve; (2) fuel change over operation B2-1: operating with 100% auxiliary fuel, except for that the signal from the power load control system is added to the signal from the gas pressure control system for the flare valve to control the flare valve; (3) fuel change over operation B2-2: continuing the same status of the change over operation B2-1 regarding the flare valve and gasification unit control, and while supplying the combined power generation unit with the auxiliary fuel and the auxiliary fuel gas so that a total amount thereof becomes an equivalent amount corresponding to the power load request, gradually change over the auxiliary fuel from 100% to zero and the fuel gas from zero to 100%; (4) fuel change over operation B3: after fuel change over to the 100% fuel gas, switching the gas pressure control system for the gasification furnace from the manual mode to the automatic mode, and switching the flare valve control system from the automatic mode to the manual mode, so as to control the gasification furnace load by receiving a signal which is an addition of signals from the power load control system and the gas pressure control system for gasification furnace; (5) fuel change over operation B4: continuously operating the fuel change over operation B3, except for sending the signal of the degree of opening of the flare valve as an advanced signal to the gasification furnace load control system, as well as controlling the flare valve by the signal compensating a dead time and a control delay of the gasification unit; (6) fuel change over operation B5: adding the signal from the gas pressure control system for the gasification furnace to the signal from the power load control system and sending to the gasification furnace load control system in order to operate the gasification unit, and the combined power generation unit is supplied with the total amount of the fuel gas produced by a normal operation of the gasification furnace in a status corresponding to the power load request, and the flare valve for the flare stack is operated in the automatic mode by the gas pressure control signal for the flare valve.
이 특허에 인용된 특허 (1)
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Fick Bruce R. (Ballston Lake NY) Jones Robert M. (Scotia NY), Coal gasification power generation plant.
이 특허를 인용한 특허 (2)
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Kishi, Makoto; Fujishima, Yasuo; Sonoda, Takashi; Hirato, Koichiro; Takata, Yasutsugu; Fujii, Fuminori, Gas turbine control device and generating system.
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Varillas, Gerardo Fidel; Abdullah, Mustafa Ahmed; Day, Scott Arthur; Thomas, Stephen Robert, Turbomachine and method of operating a turbomachine to perform a fuel change over at a high load.
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