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Closed goaf air leakage rate calculation method

A calculation method and goaf technology, applied in measurement devices, complex mathematical operations, instruments, etc., can solve the problems of low efficiency, high cost, low test accuracy, etc., and achieve accurate calculation results, good effects, and large amounts of data. Effect

Pending Publication Date: 2021-12-28
兖矿能源集团股份有限公司 +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: how to solve the problem of using SF in the prior art 6 As a tracer gas, there are problems such as low test accuracy, high cost, and low efficiency. A method for calculating air leakage in closed goafs is provided.

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  • Closed goaf air leakage rate calculation method
  • Closed goaf air leakage rate calculation method
  • Closed goaf air leakage rate calculation method

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Experimental program
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Embodiment 1

[0022] Such as figure 1 , 2 As shown, this embodiment provides a technical solution: a method for calculating air leakage in a closed goaf, which specifically includes the following contents:

[0023] First, arrange 1 release point and 2 receiving points. Continuous release of liquid CO at a steady rate at the release point on the air intake side of the goaf 2 , in the downstream direction of the wind flow in the goaf, arrange receiving points 1 and 2 to continuously monitor CO 2 Concentration, when receiving point 1, 2 CO 2 When the concentration rises from the beginning to the fall, the monitored CO 2 The cumulative change of the concentration value for 3 consecutive times shall not exceed 5%. stop liquid CO 2 injection. Receiving points 1 and 2 will pass through the hand-held self-priming CO 2 The detector monitors, and according to the formula C=exp(a+bt+ct 2 ) (a, b, c are the coefficients of the fitting equation) respectively fitting the concentration-time curve...

Embodiment 2

[0026] In this embodiment, a mine goaf CO 2 The release volume is 6.2m 3 / min, the field test shows that the receiving point 1 is CO at 3.3min 2 The concentration starts to rise from 0.29%, after 36min CO 2 Concentration stabilized at 0.67%, receiving point 2 at 5.7min CO 2 The concentration started to rise from 0.26%, after 37min CO 2 The concentration is stable at 0.52%, according to the CO measured and fitted on site 2 The gas concentration time curve is C 1 =exp(-1.58672+0.56669t-0.01514t 2 ), C 2 =exp(-1.82947+0.46784t-0.01082t 2 ),Such as image 3 shown.

[0027] According to the air leakage calculation formula, the air leakage between receiving points 1 and 2 is 28.19m 3 / min. with SF 6 Test air leakage compared to CO 2 It can be released in large quantities, and there are many sampling points to obtain the concentration fluctuation curve, and the dependence on the response time of the test equipment is small; while using SF 6 During the test, the release ...

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Abstract

The invention discloses a closed goaf air leakage rate calculation method, and belongs to the technical field of mine air leakage rate calculation, and the method comprises the following steps: S1, setting a release point on the air inlet side of a goaf, and setting two receiving points in the air flow downstream direction of the goaf, namely a first receiving point and a second receiving point; S2, continuously releasing liquid CO2 at the release point on the air inlet side of the goaf at a stable rate, and continuously monitoring at the first receiving point and the second receiving point; and S3, when the CO2 concentration of the first receiving point and the second receiving point is stable from rising to falling, stopping liquid CO2 injection. According to the method, SF6 is replaced by liquid CO2, so that the method is very economical, and the cost is greatly reduced; the air leakage rate is calculated through liquid CO2, large-area release can be achieved, and the testing method is good in effect; based on the characteristics that the peak value of the CO2 concentration-time curve is reduced and the peak pattern is widened, two points are arranged to calculate the air leakage rate, the data volume of the fitting concentration curve is large, and the calculation result is more accurate than that of an SF6 single measuring point.

Description

technical field [0001] The invention relates to the technical field of mine air leakage calculation, in particular to a method for calculating air leakage in a closed goaf. Background technique [0002] At this stage, my country's energy demand is developing very rapidly, and coal power accounts for the highest proportion of primary energy in my country. In the large-area goaf formed by coal mining, the air leakage channels are very complicated. Mining of marginal coal in mines with tight resources makes the state of the goaf change from a static state that is closed and unchanged to a dynamic state that is affected by mining. The excavation disturbance around the goaf forms a dynamic air leakage channel, which induces the spontaneous combustion of the residual coal in the closed goaf, but the related features are very hidden and difficult to find, which often plagues the development of on-site fire prevention work. The interaction between excavation disturbance and air pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/10G01N33/00
CPCG06F17/10G01N33/004
Inventor 暴晓庆马旭高蕾张英超余陶张连锋侯玉亭刘建忠孙计全王东宁
Owner 兖矿能源集团股份有限公司