The invention discloses an early-
warning system for preventing a cold ash hopper area of a 
power station boiler from 
detonation, and an adjustment method, and belongs to the field of large 
power station boiler safety. The early-
warning system for preventing the cold ash hopper area of the 
power station boiler from 
detonation comprises a main 
flue gas 
pipe, CO concentration probes, a CO concentration field treatment device, a DCS control device and a 
flue gas fan, wherein the CO concentration probes are arranged on the four walls of a cold ash hopper in the lower part of a boiler 
hearth and measure a CO concentration in the boiler; the CO concentration field treatment device collects the concentration signals of the CO concentration probes, and directly controls the opening degree of a fluegas adjustment valve through the DCS control device and according to a feedback 
signal after analysis for a concentration field; the 
flue gas fan increases the pressure of 
flue gas in a 
tail flue, and then inputs the 
flue gas into 
flue gas nozzles; and the flue gas nozzles are arranged in the cold ash hopper area in the form of a 
quadrilateral-wall contact circle, and the flue gas forms a contactcircle flow field in the cold ash hopper area via the flue gas nozzles. According to the early-
warning system for preventing the cold ash hopper area of the power 
station boiler from 
detonation, andthe adjustment method, a 
dilution medium adopted is the flue gas, has an extremely 
low oxygen content, and is higher in 
inertia compared with air, so that the risk of CO explosion can be further lowered.