CAJ | 학술논문

针对下行钻孔在瓦斯抽采过程中积水排出难和排水效率低的问题,提出了一种多孔并联式压风排水技术。根据两相流理论得出压风排水适用的条件及排水管在钻孔内的最大允许长度,设计了基于“压风排水”的下行钻孔封孔工艺和多孔并联式的排水系统。在余吾煤业公司S2107高抽巷的应用表明：试验钻孔瓦斯抽采浓度最高可达71%,单孔平均瓦斯抽采纯量为0.078 m3/min,单孔平均瓦斯抽采纯量与普通抽采孔相比提高了3.39倍。该技术不仅解决了下行钻孔内积水难以排出的问题,还实现了封孔、排水和瓦斯抽采的一体化,提高了瓦斯抽采效果。
침대하행찬공재와사추채과정중적수배출난화배수효솔저적문제,제출료일충다공병련식압풍배수기술。근거량상류이론득출압풍배수괄용적조건급배수관재찬공내적최대윤허장도,설계료기우“압풍배수”적하행찬공봉공공예화다공병련식적배수계통。재여오매업공사S2107고추항적응용표명：시험찬공와사추채농도최고가체71%,단공평균와사추채순량위0.078 m3/min,단공평균와사추채순량여보통추채공상비제고료3.39배。해기술불부해결료하행찬공내적수난이배출적문제,환실현료봉공、배수화와사추채적일체화,제고료와사추채효과。
To counter to the problem of difficult water removing and low water removing efficiency in gas drainage process by downward boreholes, a parallel multi-hole technology for water removing by compressed air was proposed. Based on the theory of the two-phase flow, the applicable conditions for water removing by compressed air and the maximum permissible length of water removing pipe in the borehole were obtained, the hole-sealing technology for downward boreholes based on “water removing by compressed air”and the parallel multi-hole water removing system were designed. The application of this technology in S2107 high-level gas drainage roadway in Yuwu Coal Company showed that the gas drainage concentration by the test borehole was up to 71%, and the average amount of pure gas drainage by a single hole was 0. 078 m3/min, increased by 3. 39 times as compared with that by a normal drainage hole. This technology not only solved the problem of difficult water removing in the downward boreholes, but also achieved the integration of the borehole sealing, water removing and gas drainage, and improved the effect of gas drainage.