Movable skid-mounted type oilfield associated gas pressure regulating device

Abstract

The invention provides a movable skid-mounted type oilfield associated gas pressure regulating device, and relates to the technical field of pressure regulating gas supplying devices for power machines and equipment. The movable skid-mounted type associated gas pressure regulating device comprises a skid block on which a main pipeline is provided, wherein one end of the main pipeline is connected with a high-pressure gas discharging flexible pipe of an oilfield associated gas tanker through a gas inlet quick joint, and the other end of the main pipeline is provided with a gas supply port. The movable skid-mounted type oilfield associated gas pressure regulating device is characterized in that a large pressure differential ice-barrier-free pressure regulating valve is arranged at downstream of the gas inlet quick joint on the main pipeline, wherein a self-balance type pressure regulator is arranged at the downstream of the large pressure differential ice-barrier-free pressure regulating valve; a first-level buffering separator is arranged at the downstream of the self-balance type pressure regulator, and provided with a flow meter at the downstream; an axial-flow type pressure regulator is arranged at the downstream of the flow meter; and a second-level buffering separator is arranged at the downstream of the axial-flow type pressure regulator. Compared with conventional technology, the technology provided by the invention can save two sets of heat exchange systems; gas heating can be automatically carried out within the large pressure differential ice-barrier-free pressure regulating valve; pressures at various levels can be rationally distributed, therefore, ice barrier caused by the temperature reduction can be prevented even the gas is not reheated during the pressure releasing process after the second level.

Description

technical field [0001] The invention relates to the technical field of pressure regulation and gas supply devices for power mechanical equipment, in particular to a skid-mounted oilfield associated gas (or CNG) pressure regulation device for fuel-natural gas hybrid mechanical movement. Background technique [0002] With the change of my country's energy structure and the continuous increase of environmental protection, the development and utilization of natural gas have developed rapidly. At present, a fuel-natural gas hybrid power system has been developed in China. Existing diesel engines can also be retrofitted with diesel and natural gas mixed dual fuels. The retrofit project requires a set of oilfield associated gas (or CNG) pressure regulating device to provide pressure and pressure for the oil-gas hybrid system. Natural gas source with stable composition. [0003] The working principle of the traditional pressure regulating device (assuming three-stage pressure regul...

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Problems solved by technology

The disadvantage of this pressure regulating device is: before the first and second stage pressure regulation, it is necessary to add a set of heat exchange system (including heat exchanger, boiler and control unit) to heat the natural gas (the purpose is to prevent gas expansion during decompression Absorption of a large amount of heat causes pipeline ice blockage, which affects the normal operation of the system), and the addition of a heat exchange system makes the device process complicated and bulky, and at the same time increases the capital investment accordingly, and there is no separation buffer device, which can only be used as a CNG tank The clean gas in the car is used for pressure regulation, which cannot meet the use requirements of oilfield associated gas that is not clean enough

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