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This invention provides a method for detecting and calculating the austenite content in steel based on a permeability meter, relating to the fields of steel and electromagnetics. Based on the theoretical differences in saturation magnetization of different phases in ferromagnetic materials, this invention establishes a theoretical calculation model and detection method for measuring austenite content using a permeability meter. A standard-prepared sample is placed in a magnetic pole shoe, and the magnetic field strength H corresponding to the maximum permeability of the ferromagnetic material is first measured. μ Then at ≥1.5H μ Under a magnetic field strength of J, the polarization intensity of the magnetic field strength at multiple points was measured at continuous intervals. m Then, based on the saturation magnetization approximation law and derivation law, the saturation magnetization Js is fitted and solved. Finally, the austenite content is determined according to the theoretical calculation model of austenite content. The method described in this invention solves the influence of the constantly changing effective magnetic path length of traditional magnetometers on the measurement results. The method for determining austenite content is simple, has a solid theoretical basis, high measurement accuracy, and strong data repeatability.

The present disclosure relates to a coal quality analysis system and method, wherein the coal quality analysis system comprises: a first heating furnace configured to heat a coal sample to volatilize moisture in the coal sample; a second heating furnace configured to heat the coal sample after dehydration by the first heating furnace to volatilize volatile matter in the coal sample and cause reactions of sulfur components, carbon components and hydrogen components; a gas supply assembly comprising: a nitrogen gas source configured to supply nitrogen gas to the first heating furnace, and an oxygen gas source configured to supply oxygen gas to the second heating furnace; and a gas analysis assembly comprising a first branch and an analysis component, a first end of the first branch being connected to an exhaust port of the second heating furnace, a second end of the first branch being connected to the analysis component, the analysis component being configured to measure a content of the volatile matter and determine contents of the corresponding components according to reaction products of the sulfur components, the carbon components and the hydrogen components.