Flame detection cooling air system used for preventing coking of coal-fired boiler and work method thereof

Abstract

The invention relates to a flame detection cooling air system used for preventing coking of a coal-fired boiler and a work method thereof. A flame detection fan A and a flame detection fan B are connected with a flame detection cooling air mother pipe, the flame detection cooling air mother pipe is connected with a flame detector, a cold primary air mother pipe is connected with the flame detector, a decoking agent storage box communicates with a first mixed opening through a first decoking agent pipeline and the flame detection cooling air mother pipe, a first pipeline filter net and a firstdecoking agent adjusting valve are sequentially arranged on the first decoking agent pipeline, the decoking agent storage box communicates with a second mixed opening through a second decoking agent pipeline and a cold primary air branch pipe, and a second pipeline filter net and a second decoking agent adjusting valve are arranged on the second decoking agent pipeline in sequence. Through the flame detection cooling air system, the decoking agent is sprayed into the boiler, the decoking agent vaporization heat absorbing is used for achieving the effect of effectively cooling the flame detector, and the flame detection cooling air system can evenly spray the decoking agent into the boiler to achieve the effect of sufficiently mixing and reacting with pulverized coal air flow.

Description

technical field [0001] The invention relates to a flame detection cooling air system for preventing coking of a coal-fired boiler and a working method thereof. Background technique [0002] At present, due to the large gap between the type of coal burned and the designed type of coal, defects in boiler structure design, and improper operation of large-scale power station coal-fired boilers, serious coking of the water-cooled wall of the furnace and high-temperature heating surfaces is caused, which reduces the thermal efficiency of the boiler and increases the coal consumption. , the economy becomes worse; especially when the coking is serious, the falling of the large coke block will cause the negative pressure of the furnace to fluctuate violently, causing a fire extinguishing accident in the furnace, affecting the safe operation of the unit, and coking also promotes high-temperature corrosion, which greatly reduces the service life of the boiler. Boiler decoking agent, as...

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Problems solved by technology

When the outdoor temperature rises in summer, the ambient temperature where the fire detection cooling fan and the primary fan are installed is relatively high, and the cooling effect is poor. High-load operation can easily cause vibration problems, resulting in failure of the fire detection fan and outage, affecting the safe and stable operation of the boiler

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