JP3716014B2 - Pressure control equipment for gasification plant - Google Patents
Pressure control equipment for gasification plant Download PDFInfo
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- JP3716014B2 JP3716014B2 JP25633295A JP25633295A JP3716014B2 JP 3716014 B2 JP3716014 B2 JP 3716014B2 JP 25633295 A JP25633295 A JP 25633295A JP 25633295 A JP25633295 A JP 25633295A JP 3716014 B2 JP3716014 B2 JP 3716014B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Description
【０００１】
【発明の属する技術分野】
本発明はガス化プラントの空気・ガス系圧力制御装置もしくは昇圧機制御装置に適用される制御アルゴリズムに関する。
【０００２】
【従来の技術】
図４は石炭ガス化複合発電プラントの一例を示す概要図である。この図に示されるように、石炭ガス化複合発電プラントは、ガス化炉設備（１００）、脱塵設備（１１０）、脱硫設備（１２０）、ガスタービン発電機（１３２）、（１３３）、排熱回収ボイラ（１４０）、蒸気タービン発電機（１５０）、（１５１）、空気昇圧機（１６１）、（１６２）、石炭供給装置（１７０）等から成る。石炭供給装置（１７０）から微粉炭を圧縮空気とともにガス化炉（１０１）内へ噴射して、ガス化剤（空気または酸素）で燃焼させることにより石炭をガス化する。
【０００３】
ガス化炉（１０１）で生成した石炭ガスは、ガス化炉後方のガス冷却器（１０２）で冷却された後、チャー回収系（１０３）、脱塵設備（１１０）、脱硫設備（１２０）で石炭ガスを精製した後、ガスタービン燃焼器へ送られて発電を行なう。また、ガスタービン駆動の空気圧縮機（１３４）から取り出された抽気は、ガス化炉圧力調整のために空気昇圧機（１６１）、（１６２）で昇圧された後、搬送用および燃焼用として加圧状態のガス化炉に圧入される。
【０００４】
石炭ガス化複合発電においては、ガス冷却器（１０２）で発生した主蒸気とガスタービン後流のガス処理装置付き排熱回収ボイラ（１４０）で発生した主蒸気を全量、蒸気タービン（１５０）で混圧結合し発電することができる程の蒸気発生となり、加圧燃焼の効果もあって、排熱回収ＬＮＧ複合発電とはガスタービン／蒸気タービンの負荷配分が異なる。
【０００５】
図５は従来の石炭ガス化炉圧力制御方式の一例を示す図である。この図に示すように、圧力設定器（３０）による圧力設定に対して、ガス化炉出口圧力（３１）と脱塵装置出口圧力信号（３２）を比較してカスケードフィードバックを行ない、Ｃ１弁（ガス焼却炉入口圧力調節弁）開度指令（３３）とともにＣ１弁に対する開度制御（３４）を行なっている。このガス化炉出口圧力制御ブロック（３５）によって構成されたガス化炉圧力制御指令（３６）は、昇圧機吐出圧力設定器（３７）に渡されて、昇圧機吐出圧力信号（４０）と比較し、昇圧機吐出圧力制御装置（３８）によって空気昇圧機入口案内ベーン開度（３９）を操作する。
【０００６】
また、制御モードがガス化炉負荷制御モード（４２）からガス化炉圧力制御モード（４３）に切り換えられた時には、ガス化炉負荷指令信号（４４）の代わりにガス化炉圧力制御指令（３６）がガス化炉入力指令（ＧＩＤ）信号（３７）として燃料および空気流量の制御を行なうようになっている。
【０００７】
上記のように、従来のガス化プラントの負荷・圧力・制御においては、ガス化炉入力要求に対して負荷・圧力制御の切り換えが採用され、またガスタービンリード、ガス化炉リード、協調制御が提案されたが、昇圧機吐出圧力は一定値制御されていた。また、それとは独立にガス化炉圧力に比して一定差圧だけ高くすることにより、昇圧機吐出圧力が必要以上に高くなることを防止する方法が提案されていた。
【０００８】
【発明が解決しようとする課題】
前記従来の圧力制御方式には、次のような解決すべき課題があった。
【０００９】
１）ガス化炉の圧力は、負荷変化等の外乱に対しても大きな変動をしないように制御を行なわないと、給炭系との差圧の変動のために燃料流量の脈動や逆流を引き起こす恐れがある。
【００１０】
２）昇圧機の吐出圧力は、高負荷帯における制御性を考えて調整すると、低負荷帯における安定性が損なわれてハンチングを起こす恐れがある。
【００１１】
３）昇圧機の吸込流量が低負荷帯で規定値よりも少なくなると、サージングを引き起こす恐れがある。
【００１２】
４）昇圧機の吸気湿度が高い場合に過冷却を行なうと、ドレンが発生して昇圧機が液圧縮を起こしたり、初段にエロージョンを起こす恐れがある。
【００１３】
【課題を解決するための手段】
本発明者は、前記従来の課題を解決するために、下記１）ないし７）に示されるガス化プラントの圧力制御装置を提案するものである。
【００１４】
１）固体燃料または液体燃料をガス化するガス化炉と、そのガス化炉で発生したガスを燃焼させて発電するガスタービンと、そのガスタービンと同軸結合された空気圧縮機と、その空気圧縮機の抽気を昇圧して上記ガス化炉へ送給する昇圧機とを備え、ガスタービンデマンドの関数としてガス化炉圧力設定を構成し、ガスタービンガバナ弁開度指令およびガス化炉入力デマンドによる負荷制御およびガス化炉圧力制御に対してガスタービン出力偏差の修正とともにガス化炉圧力偏差の修正を行なう協調制御装置において、空気供給弁とガスタービンガバナ弁を制御するとともに上記昇圧機の吐出圧力を制御する手段を備え、その設定値を、ガス化炉圧力設定に対してガス化炉へ供給される空気量により定まる圧損分を上乗せして設定し、上記昇圧機吐出圧力制御手段の調節によって昇圧機の吐出圧力を制御することを特徴とするガス化プラントの圧力制御装置。
【００１５】
２）上記要件に加えて、上記昇圧機の吐出圧力制御手段として昇圧機の入口案内ベーンを用いることを特徴とするガス化プラントの圧力制御装置。
【００１６】
３）上記１）の要件に加えて、上記昇圧機の吐出圧力制御手段として昇圧機の回転数制御を用いることを特徴とするガス化プラントの圧力制御装置。
【００１７】
４）上記１）の要件に加えて、上記昇圧機の吐出圧力制御手段として昇圧機上流に設置した入口弁を用いることを特徴とするガス化プラントの圧力制御装置。
【００１８】
５）上記１）の要件に加えて、上記ガスタービン負荷指令の関数として制御器のゲインを定め、低負荷ほど小さく設定することを特徴とするガス化プラントの圧力制御装置。
【００１９】
６）上記１）の要件に加えて、上記昇圧機の圧縮比の関数として定まるサージングライン以上の吸込流量を確保するように、再循環弁の開度を自動調節することを特徴とするガス化プラントの圧力制御装置。
【００２０】
７）上記１）の要件に加えて、上記上乗せする圧損分ΔＰを次式で定めることを特徴とするガス化プラントの圧力制御装置。
【００２１】
ΔＰ＝Ｋ（Ｐｏ／Ｐ）（Ｔ／Ｔｏ）Ｗ2
ここに Ｋ：定格点での流調弁Ｃｖ値および配管等の圧損抵抗から定まる係数
Ｐｏ、Ｔｏ：定格点での圧力、温度
Ｐ、Ｔ ：運転状態での圧力、温度
Ｗ ：空気流量
上記１）ないし４）のように制御すると、負荷変動による空気流量変化があったとしても、空気流調弁の開度を規定値＋α％の範囲に抑えることができるので、一定差圧分上乗せする場合よりも、弁のレンジアビリティを広げ流量制御装置の感度を上げることができるとともに、全閉／全開までの裕度が増すので外乱に対する対応力／耐力を上げることができる。また負荷変化に対するガスタービンガバナ弁の動きによって発生するガス圧力の変動分を、圧力修正項によって打ち消すことができる。
【００２２】
そして上記５）のように制御すると、昇圧機のＱ／Ｈ特性の傾斜の急な低負荷帯ではループゲインを下げることによってゲイン余裕の減少を防止することができる。
【００２３】
更に上記６）のように制御すると、昇圧機のサージマージンを常にある程度以上確保することができる。
【００２４】
加えて上記７）のように制御すると上記１）ないし４）の空気圧力制御の精度を向上させることができる。
【００２５】
【発明の実施の形態】
次に本発明の実施の形態を図面によって説明する。
【００２６】
まず図１に示す空気・ガス系制御について説明する。ガスタービン出力偏差信号（１）およびガス化炉圧力偏差（２）を比例制御した信号（３）、（５）および比例積分制御した信号（４）、（６）を、ガスタービン出力指令（７）の関数として定まる信号（８）、（９）にそれぞれ加減算し、ガスタービンガバナ弁開度指令（１０）およびガス化炉入力要求（１１）として、燃料、空気、スプレイ先行制御を行なう。また、ガスタービンデマンドの関数として定まるガス化炉圧力設定（１２）を２次空気流量指令信号（１３）の関数および１次空気流量指令信号（１４）の関数に加算して、それぞれの昇圧機の吐出圧力信号（１５）、（１６）と比較し（１７）、（１８）、比例・積分を行なった信号をそれぞれの昇圧機の入口案内ベーン開度を操作する信号（１７′）、（１８′）とする。
【００２７】
次に図２に２次空気昇圧機制御を纏めて示すと、図１に述べた２次空気昇圧機入口案内ベーン開度制御に加えて、ガスタービン負荷指令（１９）のゲインスケジュール関数を２次空気昇圧機吐出圧力偏差信号に乗ずることによるゲイン補正機能と、２次空気昇圧機吐出圧力（１５）と吸込圧力（２１）との比すなわち圧縮比（２２）の関数としてのサージ流量（２３）と２次空気昇圧機吸込流量（２４）の差信号（２５）の関数の時間遅れ信号によって、２次空気昇圧機再循環ベーン開度を操作する（２７）機能とを付加することになる。１次空気に関してもほぼ同様である。
【００２８】
これらの制御機能の基本構成を纏めて表現したものが図３である。
【００２９】
本実施形態の基本的原理は、ガス化炉圧力の変動を最小限に抑制するために、下流側のガスタービンガバナ弁開度指令およびガス化炉入力指令に対して、適切なガスタービン出力偏差修正および圧力偏差修正を追加するとともに、ガス化炉に空気を送る昇圧機の吐出圧力の設定に際して、空気流量変化によって変わる昇圧機からガス化炉までの圧損分だけ上乗せするような設定値制御を行なって、昇圧機入口案内ベーン開度を操作するものである。更に、この昇圧機による空気系の圧力制御機能の安定性と信頼性を補助する手段として、第１に昇圧機吐出圧力制御器のゲインをガスタービン負荷指令の関数として定めて低負荷ほど小さく設定し、第２に圧縮比の関数として定まるサージングライン以上の吸込流量を確保するように再循環弁の開度を自動調節するものである。
【００３０】
【発明の効果】
本発明においては、負荷要求指令に対してガスタービンに出された出力要求に応じて操作されるガスタービンガバナ弁および空気供給系により外乱を与えられるガス化炉圧力系に対して、空気流調弁裕度向上と制御器の感度向上およびガバナ弁による圧力偏差修正等の作用により、外乱による圧力の変動を小さく抑える効果がある。また上記の効果によって、派生的にガス化炉の燃焼状況にも好影響を与え、燃焼およびガス化特性を安定化させる効果がある。
【００３１】
更に、空気供給弁開度の変化を小さく抑えるように昇圧機吐出圧力を制御することができ、負荷変動に対しても空気供給弁に過剰な絞りを加えることがないから、絞り損失を低減でき、また部分負荷での流量制御性を確保しつつ吐出圧力が過大とならないので、補機動力を削減することができる。この点は、ガス化炉圧力に一定値を上乗せして吐出圧力設定を行なう方式よりもすぐれている特徴的な効果である。
【００３２】
本発明ではまた、どの負荷帯においても昇圧機吐出圧力制御の安定性が増し、ハンチングを防止できる。そして、どの負荷帯においても昇圧機のサージング発生を抑制でき、昇圧機制御の信頼性が増す。加えて昇圧機制御の精度が向上し、信頼性が増す。
【図面の簡単な説明】
【図１】図１は本発明の実施の一形態に係る空気・ガス系圧力制御装置を示す制御フロー図である。
【図２】図２は上記実施形態における２次空気昇圧機制御装置を示す制御フロー図である。
【図３】図３は上記実施形態の圧力制御基本構成を示す制御フロー図である。
【図４】図４は石炭ガス化複合発電プラントの一例を示す概要図である。
【図５】図５は従来の石炭ガス化炉圧力制御方式の一例を示す制御フロー図である。
【符号の説明】
（１００） ガス化炉設備
（１０１） ガス化炉
（１０２） ガス冷却器
（１０３） チャー回収系
（１１０） 脱塵設備
（１２０） 脱硫設備
（１３０） ガスタービン入口弁
（１３１） ガスタービン燃焼器
（１３２） ガスタービン
（１３３） 発電機
（１３４） 空気圧縮機
（１４０） 排熱回収ボイラ
（１５０） 蒸気タービン
（１５１） 発電機
（161)、(162) 空気昇圧機
（１６３） 空気供給弁
（１７０） 石炭供給装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control algorithm applied to an air / gas system pressure control device or a booster control device of a gasification plant.
[0002]
[Prior art]
FIG. 4 is a schematic diagram showing an example of a combined coal gasification combined power plant. As shown in this figure, the coal gasification combined power plant includes a gasification furnace facility (100), a dust removal facility (110), a desulfurization facility (120), gas turbine generators (132), (133), an exhaust It consists of a heat recovery boiler (140), steam turbine generators (150) and (151), air boosters (161) and (162), a coal supply device (170) and the like. Coal is gasified by injecting pulverized coal into the gasification furnace (101) together with compressed air from the coal supply device (170) and burning it with a gasifying agent (air or oxygen).
[0003]
The coal gas generated in the gasification furnace (101) is cooled by the gas cooler (102) at the rear of the gasification furnace, and then the char recovery system (103), the dust removal equipment (110), and the desulfurization equipment (120). After refining coal gas, it is sent to a gas turbine combustor to generate electricity. In addition, the bleed air taken out from the gas turbine driven air compressor (134) is pressurized by the air boosters (161) and (162) to adjust the gasification furnace pressure, and then added for conveyance and combustion. Pressurized into a gasification furnace under pressure.
[0004]
In the combined coal gasification combined power generation, the main steam generated in the gas cooler (102) and the main steam generated in the exhaust heat recovery boiler (140) with the gas treatment device downstream of the gas turbine are all in the steam turbine (150). Steam generation to the extent that it is possible to generate power by mixed pressure coupling is possible, and there is also an effect of pressurized combustion, and the load distribution of the gas turbine / steam turbine is different from the exhaust heat recovery LNG combined power generation.
[0005]
FIG. 5 is a diagram showing an example of a conventional coal gasifier pressure control system. As shown in this figure, for the pressure setting by the pressure setting device (30), the gasification furnace outlet pressure (31) and the dedusting device outlet pressure signal (32) are compared to perform cascade feedback, and the C1 valve ( The opening control (34) for the C1 valve is performed together with the opening command (33) of the gas incinerator inlet pressure control valve). The gasifier pressure control command (36) constituted by the gasifier outlet pressure control block (35) is passed to the booster discharge pressure setting device (37) and compared with the booster discharge pressure signal (40). The air booster inlet guide vane opening (39) is operated by the booster discharge pressure control device (38).
[0006]
When the control mode is switched from the gasifier load control mode (42) to the gasifier pressure control mode (43), the gasifier pressure control command (36) is used instead of the gasifier load command signal (44). ) Controls the flow rate of fuel and air as a gasifier input command (GID) signal (37).
[0007]
As described above, in conventional gasification plant load / pressure / control, switching of load / pressure control is adopted in response to gasifier input requirements, and gas turbine leads, gasifier leads, and coordinated control are used. Although proposed, the booster discharge pressure was controlled at a constant value. Independently, a method for preventing the booster discharge pressure from becoming higher than necessary has been proposed by increasing it by a certain differential pressure as compared with the gasifier pressure.
[0008]
[Problems to be solved by the invention]
The conventional pressure control system has the following problems to be solved.
[0009]
1) If the pressure in the gasifier is not controlled so that it does not fluctuate greatly against disturbances such as load changes, fuel flow pulsation and backflow will occur due to fluctuations in the differential pressure with the coal supply system. There is a fear.
[0010]
2) If the discharge pressure of the booster is adjusted in consideration of controllability in the high load zone, the stability in the low load zone may be impaired and hunting may occur.
[0011]
3) If the suction flow rate of the booster is less than the specified value in the low load zone, surging may occur.
[0012]
4) If supercooling is performed when the intake air humidity of the booster is high, drainage may occur and the booster may cause liquid compression or erosion in the first stage.
[0013]
[Means for Solving the Problems]
In order to solve the conventional problems, the present inventor proposes a pressure control device for a gasification plant shown in the following 1) to 7).
[0014]
1) A gasification furnace that gasifies solid fuel or liquid fuel, a gas turbine that generates electricity by burning gas generated in the gasification furnace, an air compressor that is coaxially coupled to the gas turbine, and an air compression thereof A gas booster pressure setting as a function of the gas turbine demand, and depending on the gas turbine governor valve opening command and the gasifier input demand In a cooperative control device that corrects a gas turbine output deviation as well as a gas turbine output deviation with respect to load control and gasifier pressure control, and controls an air supply valve and a gas turbine governor valve and discharge pressure of the booster The set value is set by adding a pressure loss determined by the amount of air supplied to the gasifier with respect to the gasifier pressure setting, Intensifier discharge pressure pressure controller in the gasification plant, characterized by controlling the discharge pressure of the booster by adjustment of the control means.
[0015]
2) In addition to the above-mentioned requirements, a pressure control device for a gasification plant using an inlet guide vane of a booster as discharge pressure control means of the booster.
[0016]
3) In addition to the requirement of 1) above, a pressure control device for a gasification plant, wherein the booster rotation speed control is used as discharge pressure control means for the booster.
[0017]
4) In addition to the requirement of 1) above, a gas control plant pressure control apparatus using an inlet valve installed upstream of the booster as discharge pressure control means of the booster.
[0018]
5) In addition to the requirements of 1) above, a gas control plant pressure control apparatus is characterized in that a gain of a controller is determined as a function of the gas turbine load command and is set to be smaller as the load is lower.
[0019]
6) In addition to the requirements of 1) above, the gasification is characterized by automatically adjusting the opening of the recirculation valve so as to secure a suction flow rate equal to or higher than the surging line determined as a function of the compression ratio of the booster. Plant pressure control device.
[0020]
7) In addition to the requirement of 1) above, a pressure control device for a gasification plant, wherein the additional pressure loss ΔP is determined by the following equation.
[0021]
ΔP = K (Po / P) (T / To) W 2
Here, K: coefficient Po determined from the flow regulating valve Cv value at the rated point and pressure loss resistance of the piping, To: pressure at the rated point, temperature P, T: pressure at the operating state, temperature W: air flow rate 1 above If the control is performed as in (4) to (4), even if there is a change in the air flow rate due to load fluctuations, the opening of the air flow control valve can be kept within the specified value + α% range. In addition, the rangeability of the valve can be expanded and the sensitivity of the flow rate control device can be increased, and the tolerance to fully closed / fully opened increases, so the response / resistance to disturbance can be increased. Further, the fluctuation of the gas pressure generated by the movement of the gas turbine governor valve with respect to the load change can be canceled by the pressure correction term.
[0022]
When the control is performed as in 5) above, it is possible to prevent the gain margin from decreasing by lowering the loop gain in the low load zone where the Q / H characteristic of the booster is steep.
[0023]
Further, if the control is performed as in 6) above, it is possible to always ensure a surge margin of the booster to some extent.
[0024]
In addition, if the control is performed as in the above 7), the accuracy of the air pressure control in the above 1) to 4) can be improved.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0026]
First, the air / gas system control shown in FIG. 1 will be described. The gas turbine output deviation signal (1) and the gasifier pressure deviation (2) which are proportionally controlled (3) and (5) and the signals (4) and (6) which are proportionally integral controlled are converted into a gas turbine output command (7 ) Is added to or subtracted from the signals (8) and (9) determined as a function of the fuel gas, governor valve opening command (10) and gasifier input request (11), and fuel, air, and spray advance control are performed. Further, the gasifier pressure setting (12) determined as a function of the gas turbine demand is added to the function of the secondary air flow rate command signal (13) and the function of the primary air flow rate command signal (14), and each booster is added. Compared with the discharge pressure signals (15) and (16) of (16), (17) and (18), signals (17 ') and (17') for operating the inlet guide vane opening of each booster are obtained by performing proportional and integral signals. 18 ').
[0027]
Next, FIG. 2 summarizes the secondary air booster control. In addition to the secondary air booster inlet guide vane opening control described in FIG. 1, the gain schedule function of the gas turbine load command (19) is 2 The gain correction function by multiplying the secondary air booster discharge pressure deviation signal and the surge flow rate (23 as a function of the ratio of the secondary air booster discharge pressure (15) and the suction pressure (21), ie, the compression ratio (22). ) And a time delay signal that is a function of the difference signal (25) between the secondary air booster suction flow rate (24) and (27) a function of manipulating the secondary air booster recirculation vane opening. . The same applies to the primary air.
[0028]
FIG. 3 collectively shows the basic configuration of these control functions.
[0029]
The basic principle of this embodiment is that an appropriate gas turbine output deviation with respect to the downstream gas turbine governor valve opening command and gasifier input command in order to minimize fluctuations in the gasifier pressure. In addition to the correction and pressure deviation correction, when setting the discharge pressure of the booster that sends air to the gasification furnace, the set value control is added so as to add only the pressure loss from the booster to the gasification furnace that changes depending on the air flow rate change. In operation, the booster inlet guide vane opening is operated. Furthermore, as a means for assisting the stability and reliability of the pressure control function of the air system by the booster, firstly, the gain of the booster discharge pressure controller is determined as a function of the gas turbine load command, and is set smaller as the load becomes lower. Second, the opening degree of the recirculation valve is automatically adjusted so as to ensure a suction flow rate that is equal to or higher than the surging line determined as a function of the compression ratio.
[0030]
【The invention's effect】
In the present invention, air flow control is applied to a gas turbine governor valve operated in response to an output request issued to a gas turbine in response to a load request command and a gasifier pressure system that is disturbed by an air supply system. There is an effect of minimizing pressure fluctuations due to disturbances, by improving valve tolerance, improving controller sensitivity, and correcting pressure deviations with governor valves. In addition, the effect described above has an effect of deriving positively the combustion state of the gasification furnace and stabilizing the combustion and gasification characteristics.
[0031]
Furthermore, the booster discharge pressure can be controlled so as to keep the change in the air supply valve opening small, and the throttle loss can be reduced because an excessive throttle is not applied to the air supply valve even for load fluctuations. In addition, since the discharge pressure does not become excessive while ensuring the flow rate controllability at the partial load, the auxiliary machine power can be reduced. This is a characteristic effect that is superior to the method of setting the discharge pressure by adding a certain value to the gasifier pressure.
[0032]
In the present invention, the stability of the booster discharge pressure control is increased in any load zone, and hunting can be prevented. Further, the occurrence of surging of the booster can be suppressed in any load band, and the reliability of booster control is increased. In addition, the accuracy of booster control is improved and the reliability is increased.
[Brief description of the drawings]
FIG. 1 is a control flow diagram showing an air / gas system pressure control apparatus according to an embodiment of the present invention.
FIG. 2 is a control flow diagram showing a secondary air booster control device in the embodiment.
FIG. 3 is a control flow diagram showing a basic configuration of pressure control in the embodiment.
FIG. 4 is a schematic diagram showing an example of a combined coal gasification combined power plant.
FIG. 5 is a control flow diagram showing an example of a conventional coal gasifier pressure control system.
[Explanation of symbols]
(100) Gasification furnace equipment (101) Gasification furnace (102) Gas cooler (103) Char recovery system (110) Dedusting equipment (120) Desulfurization equipment (130) Gas turbine inlet valve (131) Gas turbine combustor (132) Gas turbine (133) Generator (134) Air compressor (140) Waste heat recovery boiler (150) Steam turbine (151) Generator (161), (162) Air booster (163) Air supply valve ( 170) Coal feeder
Claims (7)
ΔＰ＝Ｋ（Ｐｏ／Ｐ）（Ｔ／Ｔｏ）Ｗ2
ここに Ｋ：定格点での流調弁Ｃｖ値および配管等の圧損抵抗から定まる係数
Ｐｏ、Ｔｏ：定格点での圧力、温度
Ｐ、Ｔ ：運転状態での圧力、温度
Ｗ ：空気流量The pressure control device for a gasification plant according to claim 1, wherein the pressure loss ΔP to be added is determined by the following equation.
ΔP = K (Po / P) (T / To) W 2
Here, K: coefficient Po determined from the flow regulating valve Cv value at the rated point and the pressure loss resistance of the piping, To: pressure at the rated point, temperature P, T: pressure at the operating state, temperature W: air flow rate
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25633295A JP3716014B2 (en) | 1995-10-03 | 1995-10-03 | Pressure control equipment for gasification plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25633295A JP3716014B2 (en) | 1995-10-03 | 1995-10-03 | Pressure control equipment for gasification plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0996227A JPH0996227A (en) | 1997-04-08 |
| JP3716014B2 true JP3716014B2 (en) | 2005-11-16 |
Family
ID=17291210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25633295A Expired - Fee Related JP3716014B2 (en) | 1995-10-03 | 1995-10-03 | Pressure control equipment for gasification plant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3716014B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963323A (en) * | 2020-07-29 | 2020-11-20 | 东方电气自动控制工程有限公司 | Fuel control method in gas turbine speed-up process |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006118391A (en) | 2004-10-20 | 2006-05-11 | Mitsubishi Heavy Ind Ltd | Control device for extracted air boosting facility in integrated gasification combined cycle plant |
| JP4745940B2 (en) | 2006-11-09 | 2011-08-10 | 三菱重工業株式会社 | Coal gasification combined power generation system and operation control method thereof |
| JP4929010B2 (en) | 2007-03-30 | 2012-05-09 | 東京電力株式会社 | Power generation system |
| JP5733906B2 (en) * | 2010-04-05 | 2015-06-10 | 三菱重工業株式会社 | Boiler equipment |
| KR101866651B1 (en) * | 2016-08-16 | 2018-06-11 | 한국서부발전 주식회사 | Control System for Integrated Gasification Combined Cycle Facility |
| CN114507550B (en) * | 2022-02-23 | 2023-04-25 | 新奥科技发展有限公司 | Pressure control system of voltage transformation device |
-
1995
- 1995-10-03 JP JP25633295A patent/JP3716014B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963323A (en) * | 2020-07-29 | 2020-11-20 | 东方电气自动控制工程有限公司 | Fuel control method in gas turbine speed-up process |
| CN111963323B (en) * | 2020-07-29 | 2022-08-02 | 东方电气自动控制工程有限公司 | Fuel control method in gas turbine speed-up process |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0996227A (en) | 1997-04-08 |
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