燃气轮机AGC控制研究与燃烧稳定性控制

发布时间：2018-03-28 10:17

本文选题：燃气轮机　切入点：联合循环　出处：《华北电力大学(北京)》2016年硕士论文

【摘要】：燃气轮机及其燃气一蒸汽联合循环发电技术近年来得到了大力的发展,国家从国外引进了大量燃气机组。然而由于国外厂家对燃机的技术壁垒,国内燃气电厂对燃气轮机多方面的控制仍存在很多问题。国内燃气电厂的运行仍然处于一个不断摸索和不断研究的阶段。与燃煤机组不同,燃气轮机的出力受环境温度和大气压力等因素的限制。机组在低负荷阶段因排气温度控制器(OTC)动作导致机组升负荷闭锁,AGC试验不达标；夏季高温天气时,机组无法达到额定负荷。这些问题都会影响机组出力。另外,大部分燃气轮机均采用低NOx贫燃预混燃烧,贫燃技术由于其当量比过低接近熄火极限,燃烧的稳定性容易受到当量比微小变化以及燃料组分变化的影响,燃烧的震荡会对燃烧室隔热瓦片产生冲击性的破坏。西门子F型燃机除了通过主保护遮断燃机之外,并没有其他控制燃烧稳定的措施,有必要进行燃烧稳定性研究。论文从OTC控制器的设计理念出发,对控制器内部限制锅炉超温部分的排气设定值进行优化,取消了低负荷期间OTC控制器对负荷的限制。依据厂家给定曲线,找出限制机组负荷的多个因素,通过对现场曲线的拟合,计算出该机组负荷的动态上限。电网利用该上限对机组进行AGC控制,解决了AGC指令大于机组最大出力的问题,为同类型机组提供了借鉴意义。论文对燃机加速度信号进行傅里叶变换,通过数据分析,总结出了一套燃机燃烧稳定性的判定规则。经过对燃烧不稳定现象的分析,验证了该规则在燃烧恶化之前能提前做出正确判断。并针对西门子F型燃机,提出了燃烧稳定性控制策略。
[Abstract]:Gas turbine and gas-steam combined cycle power generation technology has been greatly developed in recent years, the country has imported a large number of gas units from abroad. However, due to the technical barriers of foreign manufacturers to the gas turbine, There are still many problems in the control of gas turbines in domestic gas power plants. The operation of domestic gas power plants is still in a stage of constant exploration and study. The output force of gas turbine is limited by the environmental temperature and atmospheric pressure. During the low load stage, the exhaust temperature controller (OTCC) action causes the unit to fail to meet the standard of load locking AGC test, and in the high temperature weather in summer, The unit can not reach the rated load. These problems will affect the unit output. In addition, most gas turbines are premixed combustion with low NOx lean combustion. The lean combustion technology is close to the flameout limit due to its low equivalent ratio. The stability of combustion is easy to be affected by the small change of equivalent ratio and the change of fuel composition, and the shock of combustion will destroy the thermal insulation tile of the combustor. There are no other measures to control combustion stability, so it is necessary to study the combustion stability. Based on the design concept of OTC controller, this paper optimizes the exhaust setting value of the boiler overheated part of the controller. The limitation of OTC controller on load during low load period is removed. According to the curve given by the manufacturer, several factors limiting the load of the unit are found out, and the field curve fitting is carried out. The dynamic upper limit of the unit load is calculated. The AGC control of the unit is carried out by using the upper limit, which solves the problem that the AGC instruction is greater than the maximum generating force of the unit. The paper carries on the Fourier transform to the acceleration signal of the gas turbine, through the data analysis, summarizes a set of judging rules of the combustion stability of the gas turbine. It is verified that the rule can make correct judgment before combustion deteriorates, and a combustion stability control strategy is proposed for Siemens F type gas turbine.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TK477

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