A partitioned metering device for evaluation of gas drainage effect in bedding boreholes

Abstract

The invention discloses a bedding drilling gas extraction effect up-to-standard evaluation partition metering device and belongs to the field of gas extraction. The bedding drilling gas extraction effect up-to-standard evaluation partition metering device comprises a plurality of evaluation units. Each evaluation unit comprises a plurality of gas extraction junior units. Each gas extraction juniorunit comprises five gas extraction drilled holes and corresponds to a section of gas extraction pipeline, wherein the five gas extraction drilled holes are connected with the gas extraction pipelinethrough a multichannel gas collection device. The gas extraction pipelines corresponding to each evaluation unit are connected through flanges. The junctions of the gas extraction pipelines corresponding to every two adjacent evaluation units are connected through connecting parts, wherein one ends of the connecting parts are connected with the gas extraction pipelines corresponding to the previous evaluation unit through flanges, and the other ends of the connecting parts are connected with the gas extraction pipelines corresponding to the latter evaluation unit through diverging pipes. According to the bedding drilling gas extraction effect up-to-standard evaluation partition metering device, the precision of gas extraction up-to-standard evaluation partition metering can be improved, and meanwhile, energy consumption caused by the low flow and the high negative pressure in the gas extraction pipelines is reduced.

Description

technical field [0001] The invention belongs to the field of gas drainage, and in particular relates to a partitioned metering device for assessing the effectiveness of gas drainage through bed-by-bed boreholes. Background technique [0002] Mine gas is a serious hazard to coal mine production safety, seriously restricting the safe and efficient production of mines. Because gas drainage can reduce the gas pressure of coal seams, thereby reducing the probability of gas accidents, many national regulations and technical specifications on the prevention and control of gas disasters such as the "Regulations on the Prevention and Control of Coal and Gas Outbursts" regard it as a major gas prevention and control measure , has been widely promoted and applied in China. According to the requirements of the "Provisional Provisions on the Standards of Coal Mine Gas Drainage", after coal seam gas drainage, the drainage effect needs to be evaluated, and the gas drainage volume is the m...

AI Technical Summary

Problems solved by technology

For example: in the process of gas drainage measurement in the mining face, a flow meter is generally installed at the end of the gas drainage pipeline, and the gas drainage volume of each evaluation unit is manually allocated, which has a large subjective factor and the evaluation results are not accurate enough; at the same time, in the process of In the standard evaluation of the gas drainage effect of bedding boreholes, gas drainage pipelines with uniform thickness and thickness are generally arranged in the machine and wind tunnel of the working face, while the number of gas drainage boreholes at the front end of the working face is small and the flow rate is low. The low flow rate and high negative pressure in the gas drainage pipeline cause a certain amount of engineering waste

Images