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如图所示的氨,用液氨冷却铜液,要求出口铜液温度恒定。为保证氨内有一定的汽化空间,避免液氨带入造成事故,采用温度―液位串级控制。 1. 此串级控制系统的主被控变量为( ); 2. 此串级控制系统的副被控变量为( ); 试设计一温度-液位串级控制系统完成该控制方案(即将图示的氨控制系统示意图补充完整), 试画出温度――液位串级控制系统的方块图; 3. 确定气动调节阀的气开气关形式为气( )式; 4.确定主调节器的正反作用( )作用; 5. 确定副调节器的正反作用( )作用;
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