Spontaneous combustion pre-warning and fireproofing system for coal stored in raw coal hopper

Abstract

The invention relates to the field of boiler safety in power plants, and discloses a spontaneous combustion pre-warning and fireproofing system for coal stored in a raw coal hopper. The spontaneous combustion pre-warning and fireproofing system comprises a CO sensor, a smoke detector, one or more of temperature sensors, a CO2 gas bottle and a controller, wherein the CO sensor is positioned at the top of the raw coal hopper, and used for detecting the CO concentration at the top of the raw coal hopper; the smoke detector is positioned at the top of the raw coal hopper, and used for detecting the smoke concentration at the top of the raw coal hopper; the temperature sensors are positioned on the outer walls at highly spontaneous combustion points of the raw coal hopper, and used for detecting the temperatures of the highly spontaneous combustion points of the raw coal hopper; the CO2 gas bottle is connected with a first stop valve, and used for supplying CO2 gas; the controller is connected with one or more of the CO sensor, the smoke sensor and the temperature sensors as well as with the first stop valve, and used for controlling the open-close of the first stop valve according to the information provided by one or more of the CO sensor, the smoke sensor and the temperature sensors, so as to ensure that the CO2 gas bottle is communicated with or isolated from the raw coal hopper. Through the adoption of the spontaneous combustion pre-warning and fireproofing system, automatic pre-warning and inerting extinguishment can be realized when the coal stored in the raw coal hopper is subjected to spontaneous combustion.

Description

technical field [0001] The invention relates to the safety field of boilers in power plants, in particular to a coal spontaneous combustion early warning and fire prevention system in a raw coal hopper. Background technique [0002] When the pulverizing system of a thermal power plant is shut down for a long time or coal with flammable tendency is used, the temperature of the coal accumulated in the raw coal hopper will gradually rise due to oxidation, and spontaneous combustion will occur after reaching the ignition point. Spontaneously combusted coal is transported to the coal mill for grinding, which will cause chain accidents such as coal combustion and explosion. The longer the coal storage time in the raw coal hopper, the greater the probability of spontaneous combustion, and spontaneous combustion is a relatively slow process, which is not easy to detect in advance. Therefore, the spontaneous combustion of coal stored in raw coal hoppers is a major safety hazard in t...

AI Technical Summary

Problems solved by technology

This method can only control the late trend of the fire, and has no effect on the initial spontaneous combustion

Moreover, after the injected high-temperature steam condenses into water, it is easy to make the coal powder harden in the raw coal hopper, resulting in secondary hidden dangers such as the stored coal cannot fall into the pulverizing system.

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