Inerting protection method and protection device in use for silo of storing raw coal

Abstract

A method and mechanism for protecting the cylindrial coal bunker features that a telescopic aerator is arranged to its top for filling inertial gas, the aerating module is pre-embedded in its wall for filling inertial gas in coal, and the gas blocking module is arranged at its bottom for filling inertial to the position where coal is discharged.

Description

technical field [0001] The invention relates to a large silo for storing raw coal, in particular to a method for inerting safety protection of the raw coal in the silo. The invention also relates to a device for inerting safety protection of the raw coal in the silo. Background technique [0002] A silo is a large device used to store and unload bulk materials conveniently. It is also the main facility used by power plants to store raw coal in recent years. The raw coal silo is a cylindrical structure with a flat top and conical bottom built of reinforced concrete, with a volume of tens of thousands of m 3 , its internal structure is slightly different according to the capacity. The upper part of the silo is equipped with a ring-type coal distribution machine for coal distribution, and the lower part is equipped with a ring-type coal unloader for coal discharge, and a dust collector is installed to prevent dust from overflowing in the silo. It is a relatively closed contai...

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Problems solved by technology

Because the volume of the silo is too large, when the raw coal spontaneously ignites locally, the range is small, the heat is low, and the environment is greatly disturbed. The installed combustible gas concentration, oxygen content, temperature and other sensor detection facilities cannot accurately monitor the real situation in the silo, and cannot monitor the real situation of smoldering and spontaneous combustion in the silo and in the coal seam in time, until the scope of spontaneous combustion expands When the heat is high and the concentration of combustible gas increases and then reacts, the treatment time has been delayed and it is difficult to control

[0005] For safety accidents such as smoldering, spontaneous combustion, and explosions that occur in the silo, the existing measures are limited to spraying water into the silo and unloading all the coal. It is also not feasible for silos

[0006] When tens of thousands of tons of raw coal are smoldering and spontaneously combusting, the practice of pouring water on it will undoubtedly add fuel to the fire. Compared with a large amount of raw coal, a small amount of water sprayed into the silo can only serve as an oxidant, not only cannot extinguish the fire , but will accelerate the explosion of raw coal (U.S. NFPA68 / 69 explosion-proof standard); unloading tens of thousands of tons of raw coal from the silo does not require such a large site, and it takes a long time, which is also very important for fire fighting. unrealistic approach

[0007] After the accident, the silo is temporarily filled with CO 2 , N 2 Inert gas and other inert gas implementation measures for inert protection, for less than 2000m 3 Small silos can also be applied, for tens of thousands of m 3 The large raw coal silo is simply impossible to achieve

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