CN106050419A - 燃气轮机压水堆蒸汽轮机联合循环*** - Google Patents
燃气轮机压水堆蒸汽轮机联合循环*** Download PDFInfo
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- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
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- F22B1/162—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour in combination with a nuclear installation
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- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
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- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
本发明燃气轮机压水堆蒸汽轮机联合循环***涉及一种新型大容量的节能、低碳、清洁能源***;用重型燃气轮机与压水堆蒸汽轮机组成联合循环***,利用燃气轮机尾气的热量将二回路主蒸汽温度由272.8℃向上提升,随压水堆产汽量的不同和重型燃气轮机投入的台数及负荷的不同,二回路主蒸汽温度在272.8℃至630℃之间滑温运行;燃气轮机压水堆蒸汽轮机联合循环***的热效率明显高于现有技术压水堆蒸汽轮机的热效率;就燃气增发的电量而言,燃气轮机压水堆蒸汽轮机联合循环***的热效率也明显高于现有技术的燃气‑蒸汽联合循环。
Description
(一)技术领域:
本发明燃气轮机压水堆蒸汽轮机联合循环***涉及一种新型大容量的节能、低碳、清洁能源***。燃气轮机压水堆蒸汽轮机联合循环***的热效率明显高于现有技术压水堆蒸汽轮机的热效率;就燃气增发的电量而言,燃气轮机压水堆蒸汽轮机联合循环***的热效率也明显高于现有技术的燃气-蒸汽联合循环。
(二)背景技术:
压水堆(Pressurized Water Reactor)使用加压轻水作冷却剂和慢化剂,且水在堆内不沸腾的核反应堆。核燃料为低浓铀。是世界公认的大型化技术成熟,运行安全、经济实用的核反应堆型。AP1000可以作为第三代压水堆核电站的代表性产品。
AP1000第三代核电站蒸汽发生器(Steam Generator)的主要参数:
AP1000第三代核电站汽轮发电机的主要参数:
两台蒸汽发生器产生的饱和蒸汽由二回路主蒸汽***送入汽轮机高压缸,在汽轮机高压缸膨胀做功后排汽进入2台外置式汽水分离再热器;在额定负荷条件下,外置式汽水分离再热器把汽轮机高压缸排汽中所含的10%-13%的湿度减小到大约0.17%或更小;外置式汽水分离再热器设有2级再热器,第1级采用高压缸抽汽为热源,第2级采用主蒸汽为热源,将进入再热器的蒸汽加热到过热状态;蒸汽被加热后通过6根管道进入3台双流的汽轮机低压缸;部分蒸汽从高压缸和低压缸抽出用于对给水和凝结水进行回热。主凝汽器对凝结水进行除氧并将废热传到循环水***;给水由二回路主给水泵注入蒸汽发生器;汽轮机为6级给水回热提供抽汽;高压缸的抽汽点为1号高压加热器提供抽汽,高压缸排汽向除氧器提供抽汽,低压缸的第3、4、5、6级抽汽点分别向第3、4、5、6号低压加热器提供抽汽,5号低压加热器和6号低压加热器通常布置在凝汽器的喉部。
我国(包括台湾地区)已投入商业运营的核电机组全部为压水堆;从技术、安全、经济、环保和产业特点看,压水堆核电机组不宜参加电网调峰,特别是频繁地进行大幅度负荷调整。
根据工作时燃烧温度的高低和机组功率大小,电站用重型燃气轮机共分为A-B-C-D-E-F-G-H八个级别。燃气轮机的进气温度越高,机组功率越大,级别越高,热效率越高,通常燃气轮机的排气温度也越高。
现有技术燃气轮机通常与现有技术的余热锅炉、蒸汽轮机组成燃气-蒸汽联合循环***;该蒸汽轮机再热或不再热、无回热抽汽口,具有中、低压补汽进口;该蒸汽轮机配有必要的辅机,如凝结水泵、循环水泵、凝汽器、真空泵、冷却塔、润滑油***、控制油***、旁路***等;该余热锅炉通常设计成双压或者三压,分别提供不同压力的过热蒸汽,每一压力均有自己的省煤器、蒸发器、汽包、过热器;通常燃气轮机驱动的发电机所发电量约占燃气-蒸汽联合循环机组的2/3强;蒸汽轮机驱动的发电机所发电量约占燃气-蒸汽联合循环机组的1/3弱。
(三)发明内容:
所要解决的技术问题:
压水堆的蒸汽发生器只能生产二回路使用的饱和蒸汽,没有蒸汽过热能力;外置式汽水分离再热器的主要功能是把高压汽轮机排汽中所含的10%-13%的湿度减小到大约0.17%或更小,为了取得低压缸入口不到90K的过热度,甚至动用了二回路主蒸汽作为外置式汽水分离再热器的热源;压水堆蒸汽轮机的高压缸基本上是一台湿蒸汽汽轮机,各透平级的动叶片在湿蒸汽条件下工作,不利于动叶片长周期安全运行;低压缸排汽湿度也颇高于燃煤超超临界机组;高压缸、低压缸内效率仅80%左右,其热耗高达10405.7kJ/kWh(扣除电动泵功率),热效率仅34.6%(扣除电动泵功率)。
解决其技术问题采用的技术方案:
本发明燃气轮机压水堆蒸汽轮机联合循环***采取与现有技术完全不同的技术路线,用重型燃气轮机与压水堆蒸汽轮机组成联合循环***,利用燃气轮机尾气的热量将二回路主蒸汽温度由272.8℃向上提升,随压水堆产汽量的不同和重型燃气轮机投入的台数及负荷的不同,二回路主蒸汽温度在272.8℃至630℃之间滑温运行;燃气轮机压水堆蒸汽轮机联合循环***的热效率明显高于现有技术压水堆蒸汽轮机的热效率;就燃气增发的电量而言,燃气轮机压水堆蒸汽轮机联合循环***的热效率也明显高于现有技术的燃气-蒸汽联合循环。
本发明燃气轮机压水堆蒸汽轮机联合循环***包括蒸汽轮机高压缸(1)、汽水分离再热器(2)、蒸汽轮机低压缸(3)、主汽再热关断阀(4)、凝汽器(5)、1号高压加热器(6)、二回路主给水泵(7)、除氧器(8)、3号低压加热器(9)、4号低压加热器(10)、5号低压加热器(11)、6号低压加热器(12)、凝结水泵(13)、余热锅炉过热器(14)、余热锅炉高压省煤器(15)、余热锅炉低压省煤器(16)、蒸汽发生器(17)、压水堆(18)、一回路主给水泵(19)、燃气轮机(20)、汽水分离再热器旁路阀(21)、1段抽汽再热关断阀(22)、DCS分布式控制***;压水堆(18)中核燃料棒产生的热量经循环的一回路压力水在蒸汽发生器(17)中产生二回路饱和蒸汽;蒸汽发生器(17)的饱和蒸汽出口与余热锅炉过热器(14)的蒸汽进口相连接;余热锅炉过热器(14)的蒸汽出口经主汽门、调速汽门与蒸汽轮机高压缸(1)的进口相连接;余热锅炉过热器(14)的蒸汽出口经主汽再热关断阀(4)与汽水分离再热器(2)的主蒸汽进口相连接;高压缸的1段抽汽出口经1段抽汽再热关断阀(22)与汽水分离再热器(2)的1段抽汽进口相连接;余热锅炉高压省煤器(15)的水侧与1号高压加热器(6)的水侧并联,以分流的方式加热二回路主给水泵(7)出口的高压给水;余热锅炉低压省煤器(16)的水侧与由3号低压加热器(9)、4号低压加热器(10)、5号低压加热器(11)、6号低压加热器(12)串联组成的低压加热器组的水侧并联,以分流的方式加热凝结水泵(13)出口的凝结水;燃气轮机(20)的透平压气机进口经空气滤网组吸入空气,压缩后的空气在燃气轮机(20)的低氮燃烧***内与天然气混合并充分燃烧,高温高压燃气在燃气轮机(20)的燃气涡轮组中做功驱动燃气轮机侧的发电机;燃气轮机(20)的燃气涡轮组出口的燃机尾气,经烟道进入包括余热锅炉过热器(14)、余热锅炉高压省煤器(15)、余热锅炉低压省煤器(16)的燃机余热锅炉的烟侧入口;燃机余热锅炉的烟侧出口与烟囱连接或者以烟塔合一的方式由冷却塔排烟;重型燃气轮机与压水堆蒸汽轮机组成联合循环***,利用燃气轮机尾气的热量将二回路主蒸汽温度由272.8℃向上提升,随压水堆产汽量的不同和重型燃气轮机投入的台数、负荷的不同,二回路主蒸汽温度在272.8℃至630℃之间滑温运行;DCS分布式控制***协调控制压水堆(18)、燃气轮机(20)、汽水分离再热器(2)、主汽再热关断阀(4)、1段抽汽再热关断阀(22)、汽水分离再热器旁路阀(21)、蒸汽轮机高压缸(1)、蒸汽轮机低压缸(3);随压水堆产汽量的不同和重型燃气轮机投入的台数及负荷的不同,二回路主蒸汽温度在272.8℃至630℃之间滑温运行。
发明的有益效果:
●压水堆蒸汽轮机由湿蒸汽汽轮机转变为主蒸汽温度在272.8℃至630℃之间滑温运行的蒸汽轮机,在高主汽温度工况,大幅度提高了压水堆蒸汽轮机主蒸汽的进口焓值,各透平级的内效率也显著提高,在相同进口质量流量的条件下,大幅度提高了压水堆蒸汽轮机的有效焓降,输出轴功率大幅度增加;
●在高主汽温度工况,蒸汽轮机高压缸各透平级消除水蚀风险,安全性明显提高;
●在高主汽温度工况,蒸汽轮机低压缸大部分透平级消除水蚀风险,安全性明显提高,末级叶片和末前级叶片湿度显著减小,安全性、经济性明显提高;
●由于末级叶片和末前级叶片湿度显著减小,安全性可控,提供了进一步降低低压缸排汽背压,提高燃气轮机压水堆蒸汽轮机联合循环***的热效率的空间;
●余热锅炉高压省煤器(15)和余热锅炉低压省煤器(16)的设置使余热锅炉过热器(14)出口的烟气余热得到充分的利用,排烟温度可以降到45℃或者更低,排挤出来的1段抽汽、3段抽汽、4段抽汽、5段抽汽、6段抽汽可以在蒸汽轮机低压缸(3)内继续做功,转换为有用的轴功率;
●依托本发明燃气轮机压水堆蒸汽轮机联合循环***可以设计、制造单轴出力2000MW或更高出力的半转速(1800rpm或者1500rpm)巨型蒸汽轮机;
●依托本发明燃气轮机压水堆蒸汽轮机联合循环***可以设计、制造单台容量2200MVA或更高容量的半转速(1800rpm或者1500rpm)巨型汽轮发电机;
●依托本发明燃气轮机压水堆蒸汽轮机联合循环***可以设计、制造大、中型空冷发电机组,适用于内陆缺水地区;
●小功率燃气轮机压水堆蒸汽轮机联合循环***适用于全电推进的大型舰艇和民用船舶;
●本发明燃气轮机压水堆蒸汽轮机联合循环***的建造成本明显低于同容量的独立的压水堆核电机组加独立的燃气-蒸汽联合循环机组;
●本发明燃气轮机压水堆蒸汽轮机联合循环***的占地面积明显少于同容量的独立的压水堆核电机组加独立的燃气-蒸汽联合循环机组;
●本发明燃气轮机压水堆蒸汽轮机联合循环***的碳排放量明显少于同容量的独立的压水堆核电机组加独立的燃气-蒸汽联合循环机组;
●本发明燃气轮机压水堆蒸汽轮机联合循环***的单位装机容量耗水量明显少于同容量的独立的压水堆核电机组加独立的燃气-蒸汽联合循环机组;
●本发明燃气轮机压水堆蒸汽轮机联合循环***的供电量明显大于相同核燃料耗量的独立压水堆核电机组加相同天然气耗量的独立燃气-蒸汽联合循环机组;
●保留汽水分离再热器(2),在***低谷时,调停全部燃气轮机(20),打开主汽再热关断阀(4)、1段抽汽再热关断阀(22),关闭汽水分离再热器旁路阀(21),压水堆蒸汽轮机带基本负荷运行,燃气轮机(20)仍然具有完全、完整的日调峰能力;
●如将压水堆蒸汽轮机由于大幅度提高主蒸汽的进口焓值和各透平级的内效率显著提高而增发的电量全部归算到燃气-蒸汽联合循环,这种没有独立汽轮机***的燃气-蒸汽联合循环的净热效率可高达创记录的65%或更高;
●如将余热锅炉过热器(14)、余热锅炉高压省煤器(15)、余热锅炉低压省煤器(16)吸收的热量全部归算为余热锅炉的有效吸热量,这种没有蒸发器和汽包的余热锅炉的热效率(按低位发热量计算)可高达创记录的100%或更高;
●每台燃气轮机(20)都有自带的发电机,数量众多的燃气轮机群是最可靠的多重保安电源,足以保证在灾难情况下一回路主给水泵(19)和二回路主给水泵(7)的连续运行,有效避免堆芯融化恶性事故。
(四)附图说明:
图1为燃气轮机压水堆蒸汽轮机联合循环***图。
在图1中:
1 蒸汽轮机高压缸、 2 汽水分离再热器、
3 蒸汽轮机低压缸、 4 主汽再热关断阀、
5 凝汽器、 6 1号高压加热器、
7 二回路主给水泵、 8 除氧器、
9 3号低压加热器、 10 4号低压加热器、
11 5号低压加热器、 12 6号低压加热器、
13 凝结水泵、 14 余热锅炉过热器、
15 余热锅炉高压省煤器、 16 余热锅炉低压省煤器、
17 蒸汽发生器、 18 压水堆、
19 一回路主给水泵、 20 燃气轮机、
21 汽水分离再热器旁路阀、 22 1段抽汽再热关断阀。
(五)具体实施方式:
实施例1:
现结合图1以一台AP1000的压水堆、蒸汽发生器,重新设计的蒸汽轮机发电机组与3台H级燃气轮机和配套的余热锅炉为例说明实现本发明的优选方式。
本发明燃气轮机压水堆蒸汽轮机联合循环***包括蒸汽轮机高压缸(1)、汽水分离再热器(2)、蒸汽轮机低压缸(3)、主汽再热关断阀(4)、凝汽器(5)、1号高压加热器(6)、二回路主给水泵(7)、除氧器(8)、3号低压加热器(9)、4号低压加热器(10)、5号低压加热器(11)、6号低压加热器(12)、凝结水泵(13)、余热锅炉过热器(14)、余热锅炉高压省煤器(15)、余热锅炉低压省煤器(16)、蒸汽发生器(17)、压水堆(18)、一回路主给水泵(19)、燃气轮机(20)、汽水分离再热器旁路阀(21)、1段抽汽再热关断阀(22)、DCS分布式控制***;压水堆(18)中核燃料棒产生的热量经循环的一回路压力水在蒸汽发生器(17)中产生二回路饱和蒸汽;蒸汽发生器(17)的饱和蒸汽出口与余热锅炉过热器(14)的蒸汽进口相连接;余热锅炉过热器(14)的蒸汽出口经主汽门、调速汽门与蒸汽轮机高压缸(1)的进口相连接;余热锅炉过热器(14)的蒸汽出口经主汽再热关断阀(4)与汽水分离再热器(2)的主蒸汽进口相连接;高压缸的1段抽汽出口经1段抽汽再热关断阀(22)与汽水分离再热器(2)的1段抽汽进口相连接;余热锅炉高压省煤器(15)的水侧与1号高压加热器(6)的水侧并联,以分流的方式加热二回路主给水泵(7)出口的高压给水;余热锅炉低压省煤器(16)的水侧与由3号低压加热器(9)、4号低压加热器(10)、5号低压加热器(11)、6号低压加热器(12)串联组成的低压加热器组的水侧并联,以分流的方式加热凝结水泵(13)出口的凝结水;燃气轮机(20)的透平压气机进口经空气滤网组吸入空气,压缩后的空气在燃气轮机(20)的低氮燃烧***内与天然气混合并充分燃烧,高温高压燃气在燃气轮机(20)的燃气涡轮组中做功驱动燃气轮机侧的发电机;燃气轮机(20)的燃气涡轮组出口的燃机尾气,经烟道进入包括余热锅炉过热器(14)、余热锅炉高压省煤器(15)、余热锅炉低压省煤器(16)的燃机余热锅炉的烟侧入口;燃机余热锅炉的烟侧出口与烟囱连接或者以烟塔合一的方式由冷却塔排烟;重型燃气轮机与压水堆蒸汽轮机组成联合循环***,利用燃气轮机尾气的热量将二回路主蒸汽温度由272.8℃向上提升,随压水堆产汽量的不同和重型燃气轮机投入的台数、负荷的不同,二回路主蒸汽温度在272.8℃至630℃之间滑温运行;DCS分布式控制***协调控制压水堆(18)、燃气轮机(20)、汽水分离再热器(2)、主汽再热关断阀(4)、1段抽汽再热关断阀(22)、汽水分离再热器旁路阀(21)、蒸汽轮机高压缸(1)、蒸汽轮机低压缸(3);随压水堆产汽量的不同和重型燃气轮机投入的台数及负荷的不同,二回路主蒸汽温度在272.8℃至630℃之间滑温运行。
蒸汽轮机高压缸(1)双流、切向进汽,1500rpm或者1800rpm,其通流能力按最高进汽温度和最高质量流量同时达到进行设计;蒸汽轮机高压缸(1)的转子、高温进汽室、喷嘴、动叶使用的材料满足最高进汽温度下连续运行的要求;蒸汽轮机高压缸(1)的转子、喷嘴、动叶的强度满足最高进汽温度和最高质量流量同时达到时对材料的要求,并有足够的安全裕量。
蒸汽轮机低压缸(3)按工作背压不同由3台或者4台同轴的双流、切向进汽的低压缸组成;1500rpm或者1800rpm;蒸汽轮机低压缸(3)的进汽温度在343.5℃至253.6℃区间内滑温运行;蒸汽轮机低压缸(3)的最大通流能力按进汽温度343.5℃设计;当燃气轮机(20)的负荷降低,蒸汽轮机低压缸(3)的进汽温度降低到接近253.6℃时,打开主汽再热关断阀(4),关闭汽水分离再热器旁路阀(21),使蒸汽轮机低压缸(3)的进汽温度不低于253.6℃;当燃气轮机(20)负荷到0,打开1段抽汽再热关断阀(22)。
燃气轮机(20)由3台H级燃气轮机组成;3台H级燃气轮机别驱动各自的发电机;3台H级燃气轮机的燃气涡轮组出口的燃机尾气排入同一台余热锅炉;燃气轮机(20)另一优选方式由6台F级燃气轮机组成;燃气轮机(20)另一优选方式由4台G级燃气轮机组成。
汽水分离再热器(2)由6台/8台汽水分离再热器组成,即每一根低压缸进汽导汽管配置一台汽水分离再热器。
每一台汽水分离再热器配置有相应的主汽再热关断阀、1段抽汽再热关断阀和汽水分离再热器旁路阀;当汽水分离再热器旁路阀打开时汽水分离再热器的进、出口压差不超过15kPa。
燃机余热锅炉包括余热锅炉过热器(14)、余热锅炉高压省煤器(15)、余热锅炉低压省煤器(16);卧式布置;余热锅炉过热器(14)由高温、中温、低温3段过热器受热面组成,与烟气流程呈逆流布置;余热锅炉高压省煤器***配置有相应的调节阀门组,用于调节余热锅炉高压省煤器(15)的水侧与1号高压加热器(6)的水侧的流量分配;余热锅炉低压省煤器***配置有相应的调节阀门组,用于调节余热锅炉低压省煤器(16)的水侧与由3号低压加热器(9)、4号低压加热器(10)、5号低压加热器(11)、6号低压加热器(12)串联组成的低压加热器组的水侧的流量分配。
Claims (7)
1.一种燃气轮机压水堆蒸汽轮机联合循环***,其特征在于:包括蒸汽轮机高压缸(1)、汽水分离再热器(2)、蒸汽轮机低压缸(3)、主汽再热关断阀(4)、凝汽器(5)、1号高压加热器(6)、二回路主给水泵(7)、除氧器(8)、3号低压加热器(9)、4号低压加热器(10)、5号低压加热器(11)、6号低压加热器(12)、凝结水泵(13)、余热锅炉过热器(14)、余热锅炉高压省煤器(15)、余热锅炉低压省煤器(16)、蒸汽发生器(17)、压水堆(18)、一回路主给水泵(19)、燃气轮机(20)、汽水分离再热器旁路阀(21)、1段抽汽再热关断阀(22)、DCS分布式控制***;压水堆(18)中核燃料棒产生的热量经循环的一回路压力水在蒸汽发生器(17)中产生二回路饱和蒸汽;蒸汽发生器(17)的饱和蒸汽出口与余热锅炉过热器(14)的蒸汽进口相连接;余热锅炉过热器(14)的蒸汽出口经主汽门、调速汽门与蒸汽轮机高压缸(1)的进口相连接;余热锅炉过热器(14)的蒸汽出口经主汽再热关断阀(4)与汽水分离再热器(2)的主蒸汽进口相连接;高压缸的1段抽汽出口经1段抽汽再热关断阀(22)与汽水分离再热器(2)的1段抽汽进口相连接;余热锅炉高压省煤器(15)的水侧与1号高压加热器(6)的水侧并联,以分流的方式加热二回路主给水泵(7)出口的高压给水;余热锅炉低压省煤器(16)的水侧与由3号低压加热器(9)、4号低压加热器(10)、5号低压加热器(11)、6号低压加热器(12)串联组成的低压加热器组的水侧并联,以分流的方式加热凝结水泵(13)出口的凝结水;燃气轮机(20)的透平压气机进口经空气滤网组吸入空气,压缩后的空气在燃气轮机(20)的低氮燃烧***内与天然气混合并充分燃烧,高温高压燃气在燃气轮机(20)的燃气涡轮组中做功驱动燃气轮机侧的发电机;燃气轮机(20)的燃气涡轮组出口的燃机尾气,经烟道进入包括余热锅炉过热器(14)、余热锅炉高压省煤器(15)、余热锅炉低压省煤器(16)的燃机余热锅炉的烟侧入口;燃机余热锅炉的烟侧出口与烟囱连接或者以烟塔合一的方式由冷却塔排烟;重型燃气轮机与压水堆蒸汽轮机组成联合循环***,利用燃气轮机尾气的热量将二回路主蒸汽温度由272.8℃向上提升,随压水堆产汽量的不同和重型燃气轮机投入的台数、负荷的不同,二回路主蒸汽温度在272.8℃至630℃之间滑温运行;DCS分布式控制***协调控制压水堆(18)、燃气轮机(20)、汽水分离再热器(2)、主汽再热关断阀(4)、1段抽汽再热关断阀(22)、汽水分离再热器旁路阀(21)、蒸汽轮机高压缸(1)、蒸汽轮机低压缸(3);随压水堆产汽量的不同和重型燃气轮机投入的台数及负荷的不同,二回路主蒸汽温度在272.8℃至630℃之间滑温运行。
2.根据权利要求1所述的燃气轮机压水堆蒸汽轮机联合循环***,其特征是所述的蒸汽轮机高压缸(1)为双流、切向进汽,1500rpm或者1800rpm,其通流能力按最高进汽温度和最高质量流量同时达到进行设计;蒸汽轮机高压缸(1)的转子、高温进汽室、喷嘴、动叶使用的材料满足最高进汽温度下连续运行的要求;蒸汽轮机高压缸(1)的转子、喷嘴、动叶的强度满足最高进汽温度和最高质量流量同时达到时对材料的要求,并有足够的安全裕量。
3.根据权利要求1所述的燃气轮机压水堆蒸汽轮机联合循环***,其特征是所述的蒸汽轮机低压缸(3)按工作背压不同由3台或者4台同轴的双流、切向进汽的低压缸组成;1500rpm或者1800rpm;蒸汽轮机低压缸(3)的进汽温度在343.5℃至253.6℃区间内滑温运行;蒸汽轮机低压缸(3)的最大通流能力按进汽温度343.5℃设计;当燃气轮机(20)的负荷降低,蒸汽轮机低压缸(3)的进汽温度降低到接近253.6℃时,打开主汽再热关断阀(4),关闭汽水分离再热器旁路阀(21),使蒸汽轮机低压缸(3)的进汽温度不低于253.6℃;当燃气轮机(20)负荷到0,打开1段抽汽再热关断阀(22)。
4.根据权利要求1所述的燃气轮机压水堆蒸汽轮机联合循环***,其特征是所述的燃气轮机(20)由3台H级燃气轮机组成;3台H级燃气轮机别驱动各自的发电机;3台H级燃气轮机的燃气涡轮组出口的燃机尾气排入同一台余热锅炉;燃气轮机(20)另一优选方式由6台F级燃气轮机组成;燃气轮机(20)另一优选方式由4台G级燃气轮机组成。
5.根据权利要求1所述的燃气轮机压水堆蒸汽轮机联合循环***,其特征是所述的汽水分离再热器(2)由6台/8台汽水分离再热器组成,即每一根低压缸进汽导汽管配置一台汽水分离再热器。
6.根据权利要求1所述的燃气轮机压水堆蒸汽轮机联合循环***,其特征是所述的每一台汽水分离再热器配置有相应的主汽再热关断阀、1段抽汽再热关断阀和汽水分离再热器旁路阀;当汽水分离再热器旁路阀打开时汽水分离再热器的进、出口压差不超过15kPa。
7.根据权利要求1所述的燃气轮机压水堆蒸汽轮机联合循环***,其特征是所述的燃机余热锅炉包括余热锅炉过热器(14)、余热锅炉高压省煤器(15)、余热锅炉低压省煤器(16);卧式布置;余热锅炉过热器(14)由高温、中温、低温3段过热器受热面组成,与烟气流程呈逆流布置;余热锅炉高压省煤器***配置有相应的调节阀门组,用于调节余热锅炉高压省煤器(15)的水侧与1号高压加热器(6)的水侧的流量分配;余热锅炉低压省煤器***配置有相应的调节阀门组,用于调节余热锅炉低压省煤器(16)的水侧与由3号低压加热器(9)、4号低压加热器(10)、5号低压加热器(11)、6号低压加热器(12)串联组成的低压加热器组的水侧的流量分配。
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CN106050419B (zh) | 2018-08-14 |
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US20190170020A1 (en) | 2019-06-06 |
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