A multiphase flow mixed delivery device employing reciprocating driving performed by a liquid in two chambers comprises a left container (1), a right container (2), a power pump (3), a data acquisition and control system (4), a solenoid valve group, a check valve group, an inlet manifold (5), and an outlet manifold (6). A vacuum suction chamber and a compression discharging chamber alternately formed by the two containers serve as a suction chamber and a discharging chamber of a multiphase mixed flow delivery pump. After gas in a liquid-gas mixture is separated in the container, the gas is compressed by a liquid, and is discharged out of the container. The power pump constantly operates in a pure liquid working condition, thereby eliminating the issue in which a liquid with a high gas content affects the power pump. The invention requires only an ordinary water pump to achieve mixed delivery of a multiphase flow, and the ordinary water pump can even serve as a vacuum pump and a compressor for pure gas and operate continuously. Also disclosed is a multiphase flow mixed delivery method using the multiphase flow mixed delivery device employing reciprocating driving performed by a liquid in two chambers.

A multiphase flow mixed delivery device employing reciprocating driving performed by a liquid in two chambers comprises a left container (1), a right container (2), a power pump (3), a data acquisition and control system (4), a solenoid valve group, a check valve group, an inlet manifold (5), and an outlet manifold (6). A vacuum suction chamber and a compression discharging chamber alternately formed by the two containers serve as a suction chamber and a discharging chamber of a multiphase mixed flow delivery pump. After gas in a liquid-gas mixture is separated in the container, the gas is compressed by a liquid, and is discharged out of the container. The power pump constantly operates in a pure liquid working condition, thereby eliminating the issue in which a liquid with a high gas content affects the power pump. The invention requires only an ordinary water pump to achieve mixed delivery of a multiphase flow, and the ordinary water pump can even serve as a vacuum pump and a compressor for pure gas and operate continuously. Also disclosed is a multiphase flow mixed delivery method using the multiphase flow mixed delivery device employing reciprocating driving performed by a liquid in two chambers.

A physical pipeline network is decomposed into multiple subnetworks. The subnetworks include upstream subnetworks and at least one downstream subnetwork. A network solver is executed on the upstream subnetworks in parallel to obtain a set of boundary conditions and a set of control device settings. The set of boundary conditions and a set of control device settings are then used to execute the network solver on the downstream subnetwork and obtain a result having another set of control device settings. The network solver may repeat executions until convergence is achieved. When convergence is achieved, the result is presented.

A physical pipeline network is decomposed into multiple subnetworks. The subnetworks include upstream subnetworks and at least one downstream subnetwork. A network solver is executed on the upstream subnetworks in parallel to obtain a set of boundary conditions and a set of control device settings. The set of boundary conditions and a set of control device settings are then used to execute the network solver on the downstream subnetwork and obtain a result having another set of control device settings. The network solver may repeat executions until convergence is achieved. When convergence is achieved, the result is presented.

Current natural gas measurement and regulation systems are sensitive to loss of electrical power, which can cause brownouts and curtailment of power in the local area if power systems reliant on natural gas are downstream from the station. A system for regulating the flow of natural gas and for guaranteeing the flow of natural gas from a source to at least one specific flow line even when the system is not provided with electrical power may be described. Such a system may include at least one of each of: a low-pressure regulation system, a high-pressure regulation system, an inlet gas filter, a relief valve, a low select relay, a differential pressure pneumatic relay, a reset relay, a 5-way universal relay, an electromechanically operated valve, a first manual multi-way valve, a second manual multi-way valve, a high calibration valve, a low calibration valve, a filter, and/or a differential pressure measurement system.

Current natural gas measurement and regulation systems are sensitive to loss of electrical power, which can cause brownouts and curtailment of power in the local area if power systems reliant on natural gas are downstream from the station. A system for regulating the flow of natural gas and for guaranteeing the flow of natural gas from a source to at least one specific flow line even when the system is not provided with electrical power may be described. Such a system may include at least one of each of: a low-pressure regulation system, a high-pressure regulation system, an inlet gas filter, a relief valve, a low select relay, a differential pressure pneumatic relay, a reset relay, a 5-way universal relay, an electromechanically operated valve, a first manual multi-way valve, a second manual multi-way valve, a high calibration valve, a low calibration valve, a filter, and/or a differential pressure measurement system.

Improved systems and techniques are disclosed for controlling the security states of anti-theft security systems such as product display assemblies using security fobs. The tasks relating to fob authentication are offloaded to a computer system, and these authentications can be based on identifiers for the different security fobs. The computer system can maintain a list of identifiers for authorized security fobs that is easily updated when new security fobs are added to or existing security fobs are de-authorized from the system.

Improved systems and techniques are disclosed for controlling the security states of anti-theft security systems such as product display assemblies using security fobs. The tasks relating to fob authentication are offloaded to a computer system, and these authentications can be based on identifiers for the different security fobs. The computer system can maintain a list of identifiers for authorized security fobs that is easily updated when new security fobs are added to or existing security fobs are de-authorized from the system.

In a gas supply system of one embodiment, if first detection information of a high-pressure sensor exceeds a first threshold value, a gas control ECU causes a pressure adjustment range to overlap a second error range of second detection information of a mid-pressure sensor, the second error range being defined with a second threshold value as a reference point. If the first detection information is less than or equal to the first threshold value, the gas control ECU offsets the pressure adjustment range relative to the second error range defined with the second threshold value as the reference point.

In a gas supply system of one embodiment, if first detection information of a high-pressure sensor exceeds a first threshold value, a gas control ECU causes a pressure adjustment range to overlap a second error range of second detection information of a mid-pressure sensor, the second error range being defined with a second threshold value as a reference point. If the first detection information is less than or equal to the first threshold value, the gas control ECU offsets the pressure adjustment range relative to the second error range defined with the second threshold value as the reference point.