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2017-01-03View Original

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. Просим помощи у большие мастераы,
Reply #22017-01-03
. Такой схемы управления не встречал,
Reply #32017-01-04
. Обычно схема управления основана на тем
Reply #42017-01-04
. Возможно,
Reply #52017-01-04
. Низкий выбор связан с расходом топлива? 
Reply #62017-01-06
. Цель - это регулиирование тем
Reply #72017-01-06
炉子出口温度与出入口温差低选。是不是出入口温差低,联锁关闭瓦斯?
Reply #82017-01-08
炉子出口温度与出入口温差低选,然后与燃料气质量流量串级,再然后与燃料气压力高选控制加热炉温度。 炉子出入口温差显然比出口温度低,因为入口温度不可能是负数,也就是说低选的话始终选择出入口温差,感觉设置的莫名其妙,难道有什么工况会使出入口温差比出口温度低?除了仪表故障,想不出别的情况了。 一般的选择控制,正常选择的控制参数是工艺要求的参数,另一个控制参数是安全联锁参数,比如这个控制方案里的燃料气质量流量和压力选择控制,压力控制明显是安全设置,避免只调瓦斯质量流量导致瓦斯压力低熄炉。但常规设计里副回路设定为瓦斯压力就可以了,因为压力比流量稳定的多,加上长明灯和主燃料气压力低低连锁也足够了,这个选择控制也没有太大意义。 炉管介质流量低有循环氢低流量连锁就足够了。 一个出口温度弄了2个选择加串级控制,简单的问题复杂化,楼主可以问问设计是什么思路,我也学*学*。
Reply #92017-01-13
谢谢参与,回头找设计问问吧,实在不明白。

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