A Hybrid Process Monitoring and Fault Diagnosis Approach for Chemical Plants

Table 1

Monitoring variable.

Number	Variable
1	Feed flow of the unit/kmol·h^−1
2	Pressure in the feeding tank/MPa
3	Liquid level in the feeding tank/%
4	Feed flow of the depropanizer/kmol·h^−1
5	Feed temperature of the depropanizer/°C
6	Condensate water flow in the feeding preheater/kmol·h^−1
7	Condensate water temperature in the feeding preheater/°C
8	Pressure on the top of the depropanizer/MPa
9	Temperature on the top of the depropanizer/°C
10	Overhead reflux flow of the depropanizer/kmol·h^−1
11	Overhead reflux temperature of the depropanizer/°C
12	Liquid level of the overhead reflux tank/%
13	Pressure in the overhead condenser/MPa
14	Flow of the overhead product to the deethanizer/kmol·h^−1
15	Cold fluid flow in the overhead condenser/kmol·h^−1
16	C3 mole fraction in the overhead product/%
17	Sensitive tray temperature in the depropanizer/°C
18	Pressure at the bottom of the depropanizer/MPa
19	Temperature at the bottom of the depropanizer/°C
20	Liquid level at the bottom of the depropanizer/%
21	Temperature in the reboiler/°C
22	Flow rate from the reboiler back to the depropanizer/kmol·h^−1
23	Fluid temperature from the reboiler back to the depropanizer/°C
24	Liquid level in the reboiler/%
25	Hot fluid flow in the reboiler/kmol·h^−1
26	Flow of the column product to the deisobutanizer/kmol·h^−1
27	C4 mole fraction in the bottom product/%