A Calculation Method of Actual Mining Thickness in Underground Coal Gasification
A technology of underground gasification and calculation method, which is applied in the direction of applying stable tension/pressure to test the strength of materials, instruments, measuring devices, etc., can solve problems such as the underground gasification of coal that has not been calculated yet, and improve the development height of overlying fissures and surface movement and deformation prediction accuracy, reduce redundancy waste, and improve the effect of recovery rate
Active Publication Date: 2021-10-26
CHINA UNIV OF MINING & TECH
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Problems solved by technology
Although many scholars have conducted research on the composition of residual solid waste in underground coal gasification, and have also studied the development of internal cracks in underground coal gasification and its relationship with acoustic emission, there is still no calculation of the actual recovery rate of underground coal gasification. thick calculation method
Method used
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Embodiment 1
[0025] Step 1: For the underground coal gasification area, collect relevant data such as the geological mining conditions of the research area and the physical, chemical and mechanical properties of the coal, and understand the underground coal gasification process and the product types after gasification;
[0026] Step 2: According to the collected data, determine the thickness of the coal seam to be 3m, and determine the average ash content of the coal to be 30% according to the properties and composition of the coal seam, then the ash content thickness of the coal can be calculated m a for:
[0027] m a =0.9m;
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Abstract
The invention discloses a calculation method for actual mining thickness of underground coal gasification, which is suitable for use in underground coal gasification construction areas. First, the average ash content of the coal seam in the area to be gasified is obtained through data or coal samples, and then the ash thickness naturally produced after gasification is calculated through the height of the coal seam, and the pressure test is performed on the ash produced after the simulated gasification of the coal sample, so as to simulate the obtained The ash compression rate of the area to be gasified is finally calculated according to the thickness of the coal seam, the average ash content rate of the coal seam, the actual pressure of the overlying strata and the ash compression rate to calculate the actual mining thickness of the underground coal gasification. The calculation steps are simple, more in line with the actual situation, effectively improve the accuracy of the overlying rock fissure development height and surface subsidence prediction results, and ensure the safe gasification mining of coal resources under buildings and water bodies, which has a strong guiding role in practical work.
Description
technical field [0001] The invention relates to a calculation method for mining thickness, which is especially suitable for use in underground coal gasification construction areas, and is a calculation method for actual mining thickness of underground coal gasification that takes into account the characteristics of underground coal gasification and the properties of residual solid waste. [0002] technical background [0003] Underground Coal Gasification (UCG) refers to the new technology of multidisciplinary development of clean energy and chemical synthesis gas integrating well construction, coal mining and conversion technology. It is an important part of coal fluidized mining and an advanced energy technology in my country. One of the important directions in the field. At present, small-scale underground coal gasification industrial experiments of various processes have successively succeeded, laying the foundation for further large-scale experiments and production. Howe...
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IPC IPC(8): G01N3/08G01N3/06
CPCG01N3/06G01N3/08G01N2203/0085G01N2203/0682
Inventor 李怀展张学伟郭广礼查剑锋黄成魏涛刘潇鹏张克非
Owner CHINA UNIV OF MINING & TECH
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