The invention discloses a control method and 
system for a 
coke oven riser 
pipe. The 
system comprises the riser 
pipe, a bridge 
pipe, a low pressure 
ammonia water spray nozzle, a 
high pressure ammonia water spray nozzle, a corresponding low pressure 
ammonia water pipeline, a corresponding 
high pressure ammonia water pipeline and a programmable controller, wherein a pipe cover capable of being opened and closed and a pipe cover driving cylinder are arranged on the riser pipe; the bridge pipe is connected to an end opening in one side of the riser pipe; a water seal valve and a water seal valve driving cylinder are arranged at the lower end of the bridge pipe; the low pressure ammonia 
water spray nozzle is arranged at a position, which is close to a riser pipe joint, in the bridge pipe; the 
high pressure ammonia water 
spray nozzle is arranged at a position, which is located below the low pressure ammonia water 
spray nozzle, in the bridge pipe; the low pressure ammonia water pipeline and the high pressure ammonia water pipeline are respectively connected to two end openings of a three-way 
ball valve; the three-way 
ball valve is connected with a three-way 
ball valve driving cylinder or an electromagnetic driving valve; an electromagnetic switching valve or / and the electromagnetic driving valve is / are electrically connected with the controller, and is / are electrically connected with a 
coke oven 
control system. According to the 
control system disclosed by the invention, safe 
interlocking between all facilities of the riser pipe and work of a 
coal charging car of the 
coke oven and a coke pusher is realized; by 
automatic control and replacement of unmanned work for manual work, the cooperation order of workers and the 
time deviation of the manual work are eliminated, and the safety and 
environmental protection risk during work of the 
coke oven riser pipe is reduced.