Reliability Analysis of Gasifier Lock Bucket Valve System Based on DBN Method

Table 1

The DBN nodes of the gasifier lock bucket valve system.

Node	Name of the node	Reference
T	Gasifier lock bucket valve	[2]
M1	Sealing surface wear	[31]
M2	Switch not in place	[32, 33]
X1	High-pressure pulverized coal scour	[2, 31, 34]
X2	Valve ball and ball seat wear	[31]
X3	Ball seat stick together	[2]
X4	Deformation and wear of interior parts	[31, 34]
X5	Pulverized coal accumulation	[2]
X6	The actuator output torque is insufficient	[33, 34]
X7	Bearing internal adhesion under high pressure	[2, 31, 34]
X8	The pulverized coal enters during the switching process	[35]
X9	Water quality is poor	[31]
X10	Valve frequent switch	[2, 33]
X11	Short time to collect slag	[32, 36, 37]
X12	Pressure reducing too fast results in three-phase current scour	[32]