China University of Mining and Technology (CUMT)

Iyuko Services L.l.c.

Donghui Yang

Qiang Wu

Yifan Zeng

Hao Li

Jia Zhao

Junhao Ren

Zilong Yuan

Zeyang Liu

Weihong Yang

Jyshyang Chen

Aoshuang Mei

Licai Fang

Fulong Zhai

Anqi Zhou

Provided are a method for grout injection repair and water retention in a goaf, including: determining extraction information on the goaf and a coal seam, forming a barrier wall through performing a first grouting operation at a side of the goaf near the coal seam based on the extraction information, performing a second grouting operation to complete a grout injection repair from outside to inside in the goaf based on the extraction information. The first grouting pressure of the first grouting operation is less than the second grouting pressure of the second grouting operation.

Methods for grout injection repair and water retention in goaf

Disclosed are a coal mining system and a coal mining method. The coal mining system includes: a mechanical coal breaking module, an air lift reverse circulation module, a jet coal breaking module, and a coal-air-water separation module. The mechanical coal breaking module includes: a drill pipe rotating device, a drill pipe, and a reamer bit, sequentially connected to perform rotary cutting, drilling and slotting operations on a coal seam in a borehole. The air lift reverse circulation module includes: an air compressor and a dual-wall drill pipe. The air compressor is configured to transport a coal-air-water mixture through an inner pipeline of the dual-wall drill pipe to the coal-air-water separation module. The jet coal breaking module includes: the drill pipe rotating device, a fracturing truck, the drill pipe, and a jet tool string, sequentially connected to mine the coal seam.

Coal mining system and method of dual circulation drilling with mechanical reaming and abrasive jet

A coal and coalbed methane mining system based on ground drilling includes: a drilling component, a coal mining drill bit and a ground facility group. The coal mining drill bit is set at a predetermined end of a directional borehole in a coal seam, connected to the drilling component through a connecting pipeline. The ground facility group is connected to the drilling component, to provide coal cutting slurry for the coal mining drill bit, receive reflux slurry carrying coal and coalbed methane, and precipitate and separate the reflux slurry carrying the coal and the coalbed methane. A coal and coalbed methane mining method based on ground drilling and related devices are also disclosed.

Coal and coalbed methane mining system based on ground drilling, method and related device

Disclosed are an integrated mining method and an integrated mining system of coal breaking, coal extraction and water circulation in a U-well. The integrated mining system includes a first ground facility unit, a second ground facility unit, a jet unit and an extraction unit. The first ground facility unit is configured to transport jet fluid to the jet unit. The jet unit is configured to break a coal seam in a sub-segment to obtain broken cinders. The extraction unit is configured to extract a coal-water mixture. The second ground facility unit is configured to receive the coal-water mixture. In response to determining that an extraction of the sub-segment is complete, the jet unit and the extraction unit is configured to move to a next sub-segment using powers provided by the first ground facility unit and the second ground facility unit.

Integrated mining method of coal breaking, coal extraction and water circulation in U-well and system thereof

An anti-virus system for enforcing a virus monitoring and scanning process, the anti-virus and firewall system comprises a master CPU card, a plurality of slave CPU cards and a programmable logic. The master CPU card is used for controlling the virus monitoring and scanning process and dividing the virus monitoring and scanning process into a plurality of sub-processes. The plurality of slave CPU cards are controlled by the master CPU card in a software level and a hardware level, each of the plurality of slave CPU cards receives and processes one of the plurality of sub-processes then sends back to the master CPU card. The programmable logic controlled by the master CPU card for monitoring and controlling said plurality of slave CPU cards at a hardware level.

Anti-virus and firewall system

Growing community of inventors

Beijing, China

Donghui Yang