A coke extrusion force estimation method includes: measuring irregularities on an inner wall surface of a carbonization chamber to acquire an oven wall profile; estimating an outer shape of a coke produced in the carbonization chamber based on the oven wall profile; defining an active state for a side surface position of the coke at which a coke width is smaller than an oven width and defining a passive state for a side surface position of the coke at which a coke width is larger than an oven width based on the oven wall profile and the estimated outer shape; and calculating oven wall friction force for each side surface position of the coke using a previously set apparent Young's modulus of the coke in accordance with definition of the active state or the passive state to estimate the extrusion force based on the oven wall friction force.

A coke extrusion force estimation method includes: measuring irregularities on an inner wall surface of a carbonization chamber to acquire an oven wall profile; estimating an outer shape of a coke produced in the carbonization chamber based on the oven wall profile; defining an active state for a side surface position of the coke at which a coke width is smaller than an oven width and defining a passive state for a side surface position of the coke at which a coke width is larger than an oven width based on the oven wall profile and the estimated outer shape; and calculating oven wall friction force for each side surface position of the coke using a previously set apparent Young's modulus of the coke in accordance with definition of the active state or the passive state to estimate the extrusion force based on the oven wall friction force.

A coke oven monitoring system capable of quantitatively monitoring changes in the state of the furnace walls in a coke oven with good accuracy has: an oven width measurement device (6) that measures the oven width; an in-furnace observation device (7) that photographs the oven walls; and a computer (10) that analyzes oven width data measured by the oven width measurement device, and oven wall image data captured by the in-furnace observation device. The computer is characterized by including: a oven width/oven wall image data extraction unit (10a) that extracts width data and oven wall image data in different extrusion cycles for the same location of the same kiln; and an oven width/oven wall image data analysis and processing unit (10b) that determines oven wall abnormalities when the oven width data and oven wall image data obtained in the current extrusion cycle have both changed relative to the oven width data and oven wall image data obtained in past extrusion cycles in such a manner as to exceed established values. A coke oven monitoring system capable of quantitatively monitoring changes in the state of the furnace walls in a coke oven with good accuracy has: an oven width measurement device (6) that measures the oven width; an in-furnace observation device (7) that photographs the oven walls; and a computer (10) that analyzes oven width data measured by the oven width measurement device, and oven wall image data captured by the in-furnace observation device. The computer is characterized by including: a oven width/oven wall image data extraction unit (10a) that extracts width data and oven wall image data in different extrusion cycles for the same location of the same kiln; and an oven width/oven wall image data analysis and processing unit (10b) that determines oven wall abnormalities when the oven width data and oven wall image data obtained in the current extrusion cycle have both changed relative to the oven width data and oven wall image data obtained in past extrusion cycles in such a manner as to exceed established values.

A coke oven monitoring system capable of quantitatively monitoring changes in the state of the furnace walls in a coke oven with good accuracy has: an oven width measurement device (6) that measures the oven width; an in-furnace observation device (7) that photographs the oven walls; and a computer (10) that analyzes oven width data measured by the oven width measurement device, and oven wall image data captured by the in-furnace observation device. The computer is characterized by including: a oven width/oven wall image data extraction unit (10a) that extracts width data and oven wall image data in different extrusion cycles for the same location of the same kiln; and an oven width/oven wall image data analysis and processing unit (10b) that determines oven wall abnormalities when the oven width data and oven wall image data obtained in the current extrusion cycle have both changed relative to the oven width data and oven wall image data obtained in past extrusion cycles in such a manner as to exceed established values. A coke oven monitoring system capable of quantitatively monitoring changes in the state of the furnace walls in a coke oven with good accuracy has: an oven width measurement device (6) that measures the oven width; an in-furnace observation device (7) that photographs the oven walls; and a computer (10) that analyzes oven width data measured by the oven width measurement device, and oven wall image data captured by the in-furnace observation device. The computer is characterized by including: a oven width/oven wall image data extraction unit (10a) that extracts width data and oven wall image data in different extrusion cycles for the same location of the same kiln; and an oven width/oven wall image data analysis and processing unit (10b) that determines oven wall abnormalities when the oven width data and oven wall image data obtained in the current extrusion cycle have both changed relative to the oven width data and oven wall image data obtained in past extrusion cycles in such a manner as to exceed established values.