Real-time monitoring method for two-dimensional planar temperature field of underground coal gasification furnace

Abstract

The invention provides a real-time monitoring method for a two-dimensional planar temperature field of an underground coal gasification furnace, which comprises the steps of: determining a detecting point array on the ground with the underground coal gasification furnace with the connecting line of a gas inlet and a gas outlet of the underground coal gasification furnace as a reference; and continuously monitoring the radon value in soil with detecting points prior to and after ignition and gasification of the underground gasification furnace to obtain a two-dimensional planar temperature influence field, i.e. a planar geometric model of the temperature field of the gasification furnace according to the variation law of the radon values in the detecting points, and inputting the temperature of gasification agent at the gas inlet and coal gas at the gas outlet of the underground coal gasification furnace and the two-dimensional planar temperature influence field as boundary conditions into a mathematical model of the underground coal gasification temperature field, to obtain the temperature field of the underground coal gasification furnace. The two-dimensional planar temperature field with changes in the temperature of the underground coal gasification furnace can be truly reflected.

Description

technical field [0001] The invention relates to a real-time monitoring method for a two-dimensional plane temperature field of an underground coal gasification furnace. Background technique [0002] Underground coal gasification is a process in which underground coal is burned in a controlled manner, and combustible gas is generated through thermal and chemical effects on coal. It has the advantages of good safety, less investment, high benefit, and less pollution. It is highly valued by countries all over the world and is known as the second generation coal mining method. [0003] Underground coal gasification is carried out in the gasification channel in the coal seam. After the coal seam is ignited, the gasification agent is blown into the air inlet to make the coal seam burn and gasify, and the coal gas is discharged from the air outlet. The underground coal gasification process is actually a self-heating equilibrium process, relying on the heat generated by coal combus...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: using activated carbon to measure radon, which is an off-line analysis, the detection period is long, generally 5-10 days, and it cannot monitor the changes of the fire area in real time, which brings some difficulties to the timely control of the process

The disadvantage of the fifth prior art is that the wellless gasification is to build a gasifier by drilling a well, first of all, the alignment of the drilling cannot be guaranteed, and the downhole temperature exceeds the working temperature of the instrument, and the chemical environment is harsh, so the instrument cannot be installed in the Drilled down so it cannot be used

In addition, the infrared thermometer can only measure the temperature of the point, and cannot comprehensively and accurately judge the combustion area of ​​the coal.

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