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

Table 2

Failure rates of prior distribution of each node of the gasifier lock bucket valve system.

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