Fault Detection and Identification for Nonlinear Process Based on Inertia-Based KEPCA and a New Combined Monitoring Index

Table 2

Faults description for the TE process.

Fault no.	Process variable	Fault type
1	A/C feed ratio, B composition constant (stream 4)	Step
2	B composition, A/C feed ratio constant (stream 4)	Step
3	D feed temperature (stream 2)	Step
4	Reactor cooling water inlet temperature	Step
5	Condenser cooling water inlet temperature	Step
6	A feed loss (stream 1)	Step
7	C header pressure loss-reduced availability (stream 4)	Step
8	A, B, and C feed compositions (stream 4)	Random variation
9	D feed temperature (stream 2)	Random variation
10	C feed temperature (stream 4)	Random variation
11	Reactor cooling water inlet temperature condenser	Random variation
12	Cooling water inlet temperature	Slow shift
13	Reaction kinetics	Sticking
14	Reactor cooling water valve	Sticking
15	Condenser cooling water valve	Sticking
16–20	Unknown	Unknown
21	Valve position constant (stream 4)	Constant position