LNG skid-mounted station control system and installation method

Abstract

The invention provides an LNG skid-mounted station control system and an installation method. The system comprises a plurality of skid-mounted blocks arranged at an LNG skid-mounted station, the skidis connected with an instrument and a valve; an I/O module is arranged on the skid; the I/O module comprises a redundant communication interface and an I/O card. The instrument valve is connected to the skid in a point-to-point mode through an I/O clamping piece, the skid is connected with an I/O bus through the redundant communication interface and then is connected into the communication interface of a DCS control unit. The method comprises the steps that the I/O module is arranged on the skid, and the I/O module is installed in an explosion-proof box; the I/O module is arranged on the skid,and the the I/O module is installed in the explosion-proof box; and the redundant communication interface in the I/O module is connected to then I/O bus and then is connected to the DCS control unit.The pay-off number is greatly reduced, the field construction is simplified, the construction period is shortened, the engineering cost is reduced, the I/O module is arranged in the explosion-proof box and the explosion-proof and reliability of the skid are improved.

Description

technical field [0001] The invention relates to the technical field of gas control systems, in particular to an LNG skid-mounted station control system and an installation method. Background technique [0002] There is associated natural gas in a large number of oilfields in my country. For marginal oilfields, coal bed methane and biomass biogas that cannot be reached by pipeline networks, it is suitable for recycling with small LNG skid-mounted equipment. Small LNG skid-mounted equipment can realize the exploitation and use of multiple gas fields with a single set of equipment, control The system is an indispensable part to realize the overall function of LNG skid installation, and it is the decision-making and execution mechanism of the whole system. The traditional explosion-proof design of LNG skid-mounted station is a point-to-point wiring scheme, that is, the safety barrier scheme. The field equipment is connected to the DCS card point-to-point through the safety barrie...

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Problems solved by technology

The traditional explosion-proof design of LNG skid-mounted station is a point-to-point wiring scheme, that is, the safety barrier scheme. The field equipment is connected to the DCS card point-to-point through the safety barrier. This kind of explosion-proof scheme needs to lay a large number of cables and install a considerable number of Safety barriers are costly, difficult to implement, and difficult to expand. At the same time, the huge wiring workload may lead to wiring deviations and difficult calibration, which affects the progress of project construction and commissioning; To the bus, the field devices are connected to the DCS through the bus coupler. This connection requires the bus and field instruments to be intrinsically safe structures. The purchase cost of the equipment is high, the selection of instrument equipment is difficult, and the transfer and utilization of skids need to be repeatedly disassembled. Wiring work, heavy workload, high construction cost and prone to deviation

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