Method for spontaneous combustion monitoring and targeted prevention and control of residual coal in goaf drainage period

The invention discloses a method for monitoring and targeted prevention and control of residual coal spontaneous combustion during goaf drainage, a monitoring drill hole has multiple purposes and functions: (1) monitoring effect: continuously monitoring temperature and gas component change rules of different areas in a goaf through the monitoring drill hole in the front, middle and rear stages of drainage of the goaf, and monitoring residual coal spontaneous combustion; (2) inerting a goaf gas field: when water in the goaf is drained, injecting nitrogen into the goaf through the monitoring drill hole, inerting the gas environment of the goaf, inhibiting air leakage of the goaf, and optimizing and adjusting a nitrogen injection scheme in time; and (3) fire extinguishing by spontaneous combustion of the residual coal: after fire in the goaf is monitored, liquid nitrogen is immediately injected into the goaf through the monitoring drill hole, and rapid fire extinguishing of spontaneous combustion of the residual