SU91867A1 - Method for determining the propensity of coal to spontaneous combustion - Google Patents

Description

The subject of the invention is a method for determining the propensity of coal to ignite spontaneously by determining the combustion temperature.

Known analogous devices do not give sufficiently satisfactory results, which can be used to determine the actual fire hazard of the coal.

Anthracites and lean coals on average souther the highest ignition temperatures, which corresponds to their low fire risk. Llynonlamenny coals have the lowest ignition temperatures, which is also consistent with the relative ease of spontaneous combustion. However, among the coals of each group (brand) there are both prone and not inclined to spontaneous combustion, and according to the temperature of the spontaneous combustion, defined by known methods, it is impossible to distinguish between them.

The described method allows, without the use of complex equipment, to determine the TENDENCY of the coals for spontaneous combustion and is applicable for hard coals not affected by oxidation.

The difference between the described method and the known method is that the ignition temperature of the non-oxidized coal sample is first determined, then the coal sample is subjected to oxidation, the ignition temperature is again determined, and the tendency of the coal to self-ignite is judged by the reduction in ignition temperature after oxidation. In this case, for the oxidation of a sample of coal,

30% hydrogen peroxide (pergpdrol).

The determination of the inclination of coal to spontaneous combustion; p1H and the described method are carried out as follows.

Samples are taken from the fresh bottom, outside the area of the mud, if possible in the form of a KycKOR, and crushed immediately prior to analysis to a size of 0.15 mm. The ignition temperature is determined in a crucible electric furnace (1) (see drawing) into which a copper thermostatic unit (2) is inserted with openings for test tubes (3) with about, samples of coal and for thermocouple (4) (or a thermometer for 400 ). The tube is connected to a rubber tube with a burette 5 and (5) (zdmiometry) to measure the quality of the evolved gas. In these burettes, before and after the test, BG.du is sucked from the bath ((5) into which the bottom ends of the buretals are immersed. 0.1 g of crushed coal is mixed, rubbed with a wooden pestle, 0.075 g of sodium nitrite, and poured into a test tube. the cold thermostatic block and start heating at about an average speed of 5 ° per minute, noting the temperature at which the water level in the burette drops sharply due to the explosion of gas evaporating. This temperature is taken to be the coal ignition temperature.

The crushed coal is moistened with 30% hydrogen peroxide (psprprol) at the rate of 0.5 ml. on, 1 g.

The charcoal is perezzhesivayut glass rod for complete wetting and left in a dark place to stay. After complete drying of the coal from the negy, the OD is taken, mixed with nitrogen and sodium, and the fire temperature is determined by the described opo-ooo. The tendency of coal to spontaneous combustion judged the magnitude of the decrease in the temperature of combustion, oxidation after oxidation.

Object from the shadow of the shadow

Claims (2)

1. The method of determining the propensity of coal to self-ignition by determining ignition temperatures, so that, in order to simplify the met & dickle and speed up the analysis process, determine the ignition temperature of the unoxidized carbon sample, undergo oxidation by chemical oxidation, again determine the ignition temperature and The tendency of coal to spontaneously is judged by the magnitude of the decrease in the ignition temperature after oxidation. 2. In the implementation of the method according to claim 1, the use for oxidation of a shredded sample of carbon is 30% hydrogen oxide (perhydrol) at the rate of 0.5 ml. at 1 g ang.