Experimental Study on Startup of 30kW Micro Gas Turbine Generator Set

doi:10.12096/j.2096-4528.pgt.21086

Abstract

Abstract:

The safe startup of micro gas turbine generator set (MGTGS) is the premise of normal operation. The whole startup process contains the motor startup, ignition, speed promotion, motor switching from self-sustaining state to generator, gas turbine acceleration to rated speed, power generation power increase and grid connection, and rated working condition. The 30kW MGTGS was taken as the research object, the startup process was studied both theoretically and experimentally. The startup path of micro gas turbine was analyzed, and the startup scheme was formulated, and then the experiment was conducted. The results show that the startup process of MGTGS can be successfully accomplished in multiple paths with the designed startup scheme. MGTGS can cross over the self-sustaining state and the electricity is generated. Meanwhile, a higher speed can lead to lower self-sustaining turbine inlet temperature (TIT). This whole work is instructive to the safe startup process of MGTGS.

Key words: micro gas turbine generator set (MGTGS), power generation control system, startup process, self-sustaining state

CLC Number:

TK05

Jin GUAN, Zongze HE, Xiaojing LÜ, Yiwu WENG. Experimental Study on Startup of 30kW Micro Gas Turbine Generator Set[J]. Power Generation Technology, 2021, 42(4): 404-411.

Figures/Tables 13

References 22

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参数	数值
额定转速/(r/min)	34 000
压气机流量/(kg/s)	0.56
压气机入口空气温度/℃	25
压气机压比	2.4
透平膨胀比	2.3
压气机效率	0.77
燃烧室效率	0.98
燃烧室总压恢复系数	0.94
透平入口温度/℃	850
透平效率	0.82
电机效率	0.96
电动机功率/kW	30

参数	数值
额定转速/(r/min)	34 000
压气机流量/(kg/s)	0.56
压气机入口空气温度/℃	25
压气机压比	2.4
透平膨胀比	2.3
压气机效率	0.77
燃烧室效率	0.98
燃烧室总压恢复系数	0.94
透平入口温度/℃	850
透平效率	0.82
电机效率	0.96
电动机功率/kW	30

启动过程	启动路径	说明
电机从静止到启动	0–A	克服电动机启动扭矩
电动机功率短暂下降	A–B	转速从0开始升高，阻力扭矩下降，在转速很低的情况下，压气机耗功很小
电动机功率增加，转速增加	B–C	随着转速的增加，压气机耗功增加
燃烧室点火	C	转速达到点火转速，燃烧室燃料点火
电动机耗功减小，燃料增加	C–D	点火之后，透平入口温度快速升高，由于在低转速下透平的膨胀比和效率都很低，透平输出功很小
电动机功率增速缓慢，燃料增加	D–E	随着转速的增加，透平膨胀比和效率逐步增大，透平输出功逐渐增加，增速变快，但仍比机组耗功增速小
电动机功率减小，燃料量增大	E–F	随着转速的增加，透平膨胀比和效率进一步增大，透平输出功增速大于机组耗功增速，电动机功率逐渐减小
电动机功率为0	F	达到自持状态，透平输出功与机组耗功相平衡，电动机脱钩
电动机功率持续为0，燃料增加	F–G (F–K)	机组保持自持状态，增加燃料量进行升速，直至达到额定转速(直至转速达到设定的发电转速)
电动/发电方式切换	G (K)	发电机开始工作
发电机功率增加至额定功率	G–H (K–H)	燃料持续增加，透平入口温度增加，透平做功增加，机组耗功不变，发电机功率增加(转速和发电功率都增加)

启动过程	启动路径	说明
电机从静止到启动	0–A	克服电动机启动扭矩
电动机功率短暂下降	A–B	转速从0开始升高，阻力扭矩下降，在转速很低的情况下，压气机耗功很小
电动机功率增加，转速增加	B–C	随着转速的增加，压气机耗功增加
燃烧室点火	C	转速达到点火转速，燃烧室燃料点火
电动机耗功减小，燃料增加	C–D	点火之后，透平入口温度快速升高，由于在低转速下透平的膨胀比和效率都很低，透平输出功很小
电动机功率增速缓慢，燃料增加	D–E	随着转速的增加，透平膨胀比和效率逐步增大，透平输出功逐渐增加，增速变快，但仍比机组耗功增速小
电动机功率减小，燃料量增大	E–F	随着转速的增加，透平膨胀比和效率进一步增大，透平输出功增速大于机组耗功增速，电动机功率逐渐减小
电动机功率为0	F	达到自持状态，透平输出功与机组耗功相平衡，电动机脱钩
电动机功率持续为0，燃料增加	F–G (F–K)	机组保持自持状态，增加燃料量进行升速，直至达到额定转速(直至转速达到设定的发电转速)
电动/发电方式切换	G (K)	发电机开始工作
发电机功率增加至额定功率	G–H (K–H)	燃料持续增加，透平入口温度增加，透平做功增加，机组耗功不变，发电机功率增加(转速和发电功率都增加)

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