Abstract: Closed circulation system for production of and continuously preparing a polymer solution, including a pneumatic stirrer inside and a charging hopper at a top of a drag-reducing polymer solution tank, a gas drainage pump, a submersible pump, and a compressed air pipe connected to a pneumatic diaphragm pump. A liquid inlet of the pneumatic diaphragm pump is connected to a liquid outlet of the drag-reducing polymer solution tank, and the gas drainage pump liquid discharge pipe and a liquid outlet pipe of the diaphragm pump leads to a circulation water pool; a liquid outlet of the submersible pump is connected to a liquid inlet of the drag-reducing polymer solution tank and a liquid inlet of the gas drainage pump respectively through a three way pipe. The pneumatic stirrer and pneumatic diaphragm pump operate at speeds, so the drag-reducing polymer solution is mixed uniformly and fed into the circulation water pool.

Abstract: Thermal electricity conversion based on the heat extracted from underground coal fires, comprising a coalfield fire area (1), coalfield drill holes (2), underground heat conduction pipelines (3) and a heat conduction container (4) which is provided with a pressure relief device (5) thereon and further comprises thermoelectric power generation chip sets (6) and a storage battery (7), wherein the thermoelectric power generation chip sets (6), having cold-side radiator pipes (8) provided on outer sides thereof, are provided on an outer side wall of the heat conduction container (4). The thermoelectric power generation chip sets in the invention are directly attached on the heat conduction container, so that the system is simple in structure without redundant components and high in heat conduction efficiency.

Abstract: A stampede preventing method for a pedestrian passage in a confined space of a subway. Pedestrian flow sensors are arranged on a pedestrian passage, where the pedestrian flow sensors are connected to a control unit by means of data transmission lines, the control unit is connected to stampede preventing devices and top ends of the stampede preventing devices are connected to movable walls and handrails; the pedestrian flow sensors transmit a pedestrian number and crowdedness that are monitored in real time; the control unit analyzes signals of the pedestrian flow sensors according to a system program, and determines whether crescent buffer space areas need to be opened in the pedestrian passage; the control unit issues different expansion commands according to different degrees of crowdedness; and the stampede preventing devices control the movable walls and the handrails to start contracting to form the crescent buffer space areas.

Abstract: The present invention discloses a closed circulation system for improving operating efficiency of a gas drainage pump. A liquid inlet of a pneumatic diaphragm pump is connected to a liquid outlet of a drag-reducing polymer solution tank, and a liquid outlet pipe of the pneumatic diaphragm pump leads to a circulation water pool. The drag-reducing polymer solution tank is provided with a pneumatic stirrer internally, and a charging hopper at the top. A liquid outlet of a submersible pump is connected to a liquid inlet of the drag-reducing polymer solution tank and a liquid inlet of a gas drainage pump respectively through a three way pipe, and a liquid discharge pipe of the gas drainage pump is connected to the circulation water pool. The pneumatic stirrer and the pneumatic diaphragm pump operate at high speeds.

Abstract: A stampede preventing method for a pedestrian passage in a confined space of a subway. Pedestrian flow sensors are arranged on a pedestrian passage, where the pedestrian flow sensors are connected to a control unit by means of data transmission lines, the control unit is connected to stampede preventing devices and top ends of the stampede preventing devices are connected to movable walls and handrails; the pedestrian flow sensors transmit a pedestrian number and crowdedness that are monitored in real time; the control unit analyzes signals of the pedestrian flow sensors according to a system program, and determines whether crescent buffer space areas need to be opened in the pedestrian passage; the control unit issues different expansion commands according to different degrees of crowdedness; and the stampede preventing devices control the movable walls and the handrails to start contracting to form the crescent buffer space areas.

Abstract: A pneumatic fracturing method for exploiting shale gas, the method including: 1) applying a compressed gas for a first period of time at a first pressure to a shale formation; 2) applying the compressed gas for a second period of time at a second pressure to the shale formation; and 3) repeating steps 1) and 2) to produce fissures in the shale formation. A temperature of the compressed gas is at least 80° C. A maximum pressure of the compressed gas is at least 25 megapascal, and a minimum pressure of the compressed gas is between ¼ and ? of the maximum pressure.

Abstract: A pneumatic fracturing method for exploiting shale gas, the method including: 1) applying a compressed gas for a first period of time at a first pressure to a shale formation; 2) applying the compressed gas for a second period of time at a second pressure to the shale formation; and 3) repeating steps 1) and 2) to produce fissures in the shale formation. A temperature of the compressed gas is at least 80° C. A maximum pressure of the compressed gas is at least 25 megapascal, and a minimum pressure of the compressed gas is between ¼ and ? of the maximum pressure.