Device for simulation of coal spontaneous combustion on basis of programmed temperature control

Abstract

The invention relates to a device for coal detection, in particular to a device for the simulation of coal spontaneous combustion on the basis of programmed temperature control. A stainless steel plate (3), an electrical heating tape (4), a heat insulation and preservation material layer (5) and a packaging iron sheet (6) are sequentially arranged from inside to outside between the inner wall andouter wall of a reaction tube (1); a coal-bearing pallet (7) is arranged at the bottom of the reaction tube (1); an air inlet pipe (8) is extended into an air cushioning layer (10) at the bottom of the reaction tube (1) via the wall surface of the reaction tube (1); an air outlet pipe (9) is led out from an air cushioning layer (11) at the upper part of the reaction tube (1); thermocouple temperature probes are distributed in the inner cavity of and between the inner wall and the outer wall of the reaction tube (1); and gas sampling points (15) and an SF6 (sulfur hexafluoride) gas injection point (16) are distributed in the inner cavity of the reaction tube (1). Based on the programmed temperature-control method, the device of the invention is capable of achieving the process of coal spontaneous combustion under two experimental conditions, i.e., adiabatic oxidation and accelerated oxidation, thereby determining the characteristics of coal in low-temperature oxidation more accurately.

Description

Technical field [0001] The invention relates to a device for coal detection, in particular to a coal spontaneous combustion simulation device based on program temperature control. Background technique [0002] Coal spontaneous combustion is one of the main causes of coal mine fires. According to statistics, in my country's state-owned key coal mines, mines with spontaneous fire hazards account for about 51.3%, accounting for more than 90% of the total mine fires. The spontaneous combustion of coal has caused serious waste of coal resources and threatened the personal safety of underground workers. In order to put forward practical countermeasures for on-site fire prevention and control, it is necessary to study the mechanism and macro characteristics of coal spontaneous combustion. [0003] The heat released during low-temperature oxidation of coal is small and the rate is slow, which brings some difficulties to the research on the characteristics of coal spontaneous combustion a...

AI Technical Summary

Problems solved by technology

[0003] The heat released during the low-temperature oxidation of coal is small and the rate is slow, which brings some difficulties to the research on the temperature rise characteristics of coal spontaneous combustion oxidation

Large-scale simulation experiments can more realistically reflect the actual situation of coal spontaneous combustion, but due to the large amount of coal samples required, the test period is long (often tens of days or more than several months), the workload is heavy, and the cost is high. The disadvantage of poor repeatability leads to the limitation of popularization and application

The small-scale simulation experiment has the characteristics of fast speed, low cost, and easy control, and is favored by some colleagues. However, because the coal sample size of the small-scale simulation test is only between tens to hundreds of grams, it is far from the actual situation of coal spontaneous combustion on site. , it is difficult to truly simulate the spontaneous combustion of coal under the actual conditions on site

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