公开(公告)号：US3925645A

公开(公告)日：1975-12-09

申请号：US55636375

申请日：1975-03-07

Applicant: WESTINGHOUSE ELECTRIC CORP

Inventor： STERN LOUIS P

IPC: F01K13/02 ,  F22B35/18 ,  F01D17/02 ,  G05B15/02

CPC classification number: F22B35/18 ,  F01K13/02

Abstract: A boiler-steam turbine plant control system for transferring between boiler-follow, turbine-follow, and coordinated operating modes, without any change in the output of the turbine or the firing rate of the boiler, is disclosed. A feedforward load demand signal controls both the turbine and boiler in parallel. In the turbine-follow mode, a feedback loop trims the feedforward signal to the turbine only. In the boiler-follow mode, a feedback loop trims the feedforward signal to the boiler only. In the coordinated mode, feedback loops trim the feedforward signal to both the turbine and boiler. In response to initiating a transfer to either the boiler or turbine-follow mode, the load demand signals which are controlling the boiler and turbine are held at their pre-transfer value; and the feedforward signal is modified to equal the pre-transfer value of the trimmed feedforward signal. A signal, which is equal in value to the pre-transfer value of the feedforward signal less the value of the trimmed feedforward signal is generated in the output of the feedback loop which is to be placed in service as a result of the transfer. To transfer to the coordinated mode, the feedforward signal is modified to equal a signal representative of the actual power output of the plant. The turbine feedback loop generates a signal representative of the pre-transfer turbine demand signal less the modified feedforward signal. The boiler feedback loop generates a signal representative of the pre-transfer boiler demand signal less the modified feedforward signal.

Abstract translation: 公开了一种锅炉 - 蒸汽轮机设备控制系统，用于在锅炉跟随，涡轮跟随和协同运行模式之间转换，而不会改变涡轮机的输出或锅炉的点火速率。 前馈负载需求信号并行控制涡轮机和锅炉。 在涡轮跟随模式中，反馈回路仅将前馈信号修剪到涡轮机。 在锅炉跟随模式下，反馈回路仅将前馈信号修剪到锅炉。 在协调模式下，反馈回路将前馈信号调整到涡轮机和锅炉。 响应于开始转移到锅炉或涡轮机跟随模式，控制锅炉和涡轮机的负载需求信号保持在其预转移值; 并且前馈信号被修改为等于修整的前馈信号的传送前值。 在作为转移的结果投入使用的反馈回路的输出中产生与前馈信号的预传送值相等的信号，减去修整的前馈信号的值。