Pressure-regulating and metering pry for liquefied natural gas device

Abstract

The invention discloses a pressure-regulating and metering pry for a liquefied natural gas device. The pressure-regulating and metering pry comprises a prizing base and further comprises a gas-liquid separator which is arranged on the prizing base in a natural gas flow direction and two branches which are successively connected with the top of the gas-liquid separator, wherein each branch comprises a basket type filer, a pressure-regulating valve, a rectifier and a flow rate meter which are connected in sequence; ripple compensators which are used for preventing prizing blocks from being damaged by stress due to extremely high natural gas pressure are respectively arranged at a gas inlet end and a gas discharge end of the metering pry; a bypass which is used for replacing during maintenance of the gas-liquid separator is further arranged between a natural gas inlet end and a natural gas outlet end of the gas-liquid separator. The metering pry disclosed by the invention is relatively optimized and reasonable in design, effectively prolonged in service life, and can truly realize continuous pressure-regulating and metering to raw material natural gas; moreover, two loops are arranged to truly realize the pressure-regulating function and the metering function of double loops, so that the production operation cost and the equipment maintenance cost are effectively reduced.

Description

Technical field [0001] The invention relates to a skid-mounted device, in particular to a pressure regulating metering skid for a liquefied natural gas device. Background technique [0002] With economic development and increasingly severe environmental problems, natural gas as a clean energy replaces oil and coal in the world’s energy consumption pattern. In order to meet the increasing energy demand for natural gas, in recent years, domestic Foreign natural gas liquefaction devices continue to emerge. In the natural gas liquefaction plant, the natural gas pressure regulating metering skid plays a vital role, because it is an important core device for the front-end trade metering of natural gas and the stable pressure intake for the back-end feed gas compressor, which is directly related to the entire liquefied natural gas The smooth operation of the plant, accurate metering and LNG capacity assessment. [0003] At present, in the domestic LNG industry, the following two meterin...

AI Technical Summary

Problems solved by technology

[0005] (1) The service life of the pressure regulating valve is short, and the natural gas composition at the inlet end is complex, which contains saturated water, mechanical dust and oil stains, and is not protected by filtration first. The pressure regulating valve is designed before the gas-liquid separator, which greatly reduces the The service life of the pressure regulating valve; in addition, when the pressure regulating valve is overhauled and replaced, the raw natural gas is bypassed by the pressure regulating valve, and the pressure of the raw material gas cannot be accurately adjusted, which will affect the smooth operation of the subsequent compressor and the production capacity of the device

[0006] (2) At the inlet and outlet ends of the natural gas pressure regulating metering skid, when the natural gas pressure is high, the stress impact on the entire skid is large, which affects safe operation

[0007] (3) When the wire mesh on the top of the gas-liquid separator needs to be repaired and replaced, the whole plant must be shut down, which will affect the normal operation of the work

[0008] (4) In a small liquefied natural gas plant, when the diameter of the gas-liquid separator is too small to open a maintenance hole, the top wire mesh demister cannot be replaced, which greatly reduces the service life of the gas-liquid separator

[0010] (1) Although this process effectively protects the pressure regulating valve and prolongs its service life, it cannot play the role of pressure regulation when the pressure regulating valve is damaged and needs to be repaired and replaced.

[0011] (2) At the inlet and outlet ends of the natural gas pressure regulating metering skid, when the natural gas pressure is high, the stress impact on the entire skid is large, which affects the safe operation of the metering skid

Images