Simulation device and method for low temperature oxidation of coal

Abstract

The invention discloses a simulation device and method for low temperature oxidation of coal. The simulation device is characterized in that gas with different concentrations is prepared in a reference cylinder by regulating a pressure regulating valve; three independent gas circulation circuits is achieved through a frequency conversion circulation pump; gas pressure in the loops is controlled through the pressure regulating valve at front ends of the circulation loops; gas flow in the circulation loops is controlled through a variable frequency circulation pump; experiment temperature is controlled through water bath heating in a low temperature oxidation chamber; three coal sample tanks can be used to place coal samples of different particle sizes, and the size of coal sample particlesis controlled; an electric coupler, a pressure sensor and a pneumatic valve are connected to a control cabinet, and automatic recording of test parameters and automatic control of pipelines are achieved; the coal sample tanks are designed in a wavy shape with uniform flow grids installed inside, the contact area between the gas and the coal samples is increased, and the reaction efficiency is improved. The entire device is simple in operation and high in operation efficiency, and the demand for multi-factor controlled low temperature oxidation experiment of coal is met.

Description

technical field [0001] The invention belongs to the field of coal mine safety production, and in particular relates to a simulation device for low-temperature oxidation of coal. Background technique [0002] Coal is the main energy source in our country. During the coal mining process, continuous ventilation increases the contact probability of oxygen in the air and coal, which causes low-temperature oxidation or even spontaneous combustion of underground coal. The low temperature oxidation of coal will produce a series of gases, such as: CO, CO 2 、CH 4 、C 2 h 2 、C 2 h 4 、C 2 h 6 , where the existence of CO endangers the health of miners and easily leads to safety accidents, CO 2 and CH 4 Emission into the atmosphere will further aggravate the greenhouse effect and threaten the living environment of human beings. The low-temperature oxidation of coal is related to many factors, such as: the nature of the coal, the concentration of oxygen, the particle size of the c...

AI Technical Summary

Problems solved by technology

[0003] The current coal low-temperature oxidation device often has the following disadvantages: only one or several influencing factors can be controlled, such as: only temperature, gas concentration, etc.; the device structure has limitations and the gas cannot be circulated, and the contact area between the gas and the coal sample Smaller, low coal sample efficiency; only one sample can be installed in one experiment, which increases the complexity of the experiment; in addition, these devices are relatively single, with simple functions, and cannot better realize the laboratory simulation of the entire low-temperature oxidation process

Images