Rectification-type self-overlaying gas liquefying system

Abstract

The invention discloses a rectification-type self-overlaying gas liquefying system, which comprises a compressor, a condenser, a rectifying device and a raw material gas liquefying loop. A discharging port of the compressor is connected with a feeding port of the condenser; a discharging port of the condenser is connected with a feeding port in a kettle of the rectifying device; the rectifying device comprises a rectifying tower and a tower top heat exchanger, wherein the tower top heat exchanger is communicated with the top of a rectifying section of the rectifying tower; a discharging port at the top of the tower top heat exchanger is connected with the raw material gas liquefying loop; and the raw material gas passes through the raw material gas liquefying loop and a final liquefying product is obtained. In the invention, a multi-stage separation process of the traditional mixed working medium liquefying system is replaced by the rectifying device, the high-pressure liquids with different components led out from the bottom and the top of the rectifying device are respectively subject to pressure reduction to enter the raw material gas liquefying loop, the change of the water equivalent weight in the temperature-reduction liquefying process is matched in an optimized way so that the raw material gas is cooled section by section. The rectification-type self-overlaying gas liquefying system has the advantages of simple structure, reliability in operation, high system liquefying efficiency and the like, and is particularly suitable for various mini-type and micro-type gas liquefying systems.

Description

Technical field

[0001] The invention relates to a gas liquefaction system, in particular to a rectification type self-cascade gas liquefaction system. Background technique

[0002] In large-scale natural gas liquefaction projects, the mixed refrigerant self-cascade gas liquefaction system has replaced the classic cascade gas liquefaction system and has been widely used. However, because these traditional mixed refrigerant gas liquefaction systems use a 2 to 5 stage equilibrium separation and segregation process, the processing conditions of lubricating oil have been greatly improved, but the structure of the cycle has become correspondingly complicated, and the operation process is The adaptability of air source and ambient temperature becomes poor and difficult to control. Especially for small and micro gas liquefaction devices, simplicity of equipment is a very important determinant. The above-mentioned traditional liquefaction systems cannot adapt to the miniaturization and m...

Examples

Embodiment 1

[0023] As attached figure 1 As shown, a rectification type self-cascading gas liquefaction system includes a compressor 1, a condenser 2, a rectification device 3, a first heat exchanger 6, a second heat exchanger 7, and a third heat exchanger 8. The first throttle element 9, the second throttle element 10, the third throttle element 11, the fourth throttle element 12, the fifth throttle element 13, the sixth throttle element 14, and the seventh throttle element 15. The rectification device 3 includes a rectification tower and an overhead heat exchanger connected to the top of the rectification section of the rectification tower. Both the first heat exchanger 6 and the second heat exchanger 7 are provided with a refrigerant pipe and a raw gas liquefaction pipe, and a plurality of feeding or discharging ports communicating with the inner cavity are provided on the outer wall. The third heat exchanger 8 is provided with a raw material gas liquefaction pipeline, and the outer wall...

Embodiment 2

[0040] The only difference from Embodiment 1 is that a filter dryer 4 and a bottom heat exchanger 5 are provided between the bottom of the rectification tower and the fifth throttling element 13 or the sixth throttling element 14 or the seventh throttling element 15. . Among them, the liquid outlet 3b at the bottom of the rectification tower of the rectification device 3 is first connected to the inlet 4a of the filter drier 4, and the outlet 4b of the filter drier 4 is connected to one of the pipes in the bottom heat exchanger 5. The inlet end 5a is connected, and the outlet end 5b of the pipeline is respectively connected to the inlet of the fifth throttle element 13 or the sixth throttle element 14 or the seventh throttle element 15; there is another inside the bottom heat exchanger 5 The inlet end 5c of a pipe is connected, and the outlet end 5d of the pipe is connected with the suction port 1a of the compressor 1; the inlet ends 5a and 5c of the two pipes in the bottom hea...

Technical field

[0001] The invention relates to a gas liquefaction system, in particular to a rectification type self-cascade gas liquefaction system. Background technique

[0002] In large-scale natural gas liquefaction projects, the mixed refrigerant self-cascade gas liquefaction system has replaced the classic cascade gas liquefaction system and has been widely used. However, because these traditional mixed refrigerant gas liquefaction systems use a 2 to 5 stage equilibrium separation and segregation process, the processing conditions of lubricating oil have been greatly improved, but the structure of the cycle has become correspondingly complicated, and the operation process is The adaptability of air source and ambient temperature becomes poor and difficult to control. Especially for small and micro gas liquefaction devices, simplicity of equipment is a very important determinant. The above-mentioned traditional liquefaction systems cannot adapt to the miniaturization and m...

Examples

Embodiment 1

[0023] As attached figure 1 As shown, a rectification type self-cascading gas liquefaction system includes a compressor 1, a condenser 2, a rectification device 3, a first heat exchanger 6, a second heat exchanger 7, and a third heat exchanger 8. The first throttle element 9, the second throttle element 10, the third throttle element 11, the fourth throttle element 12, the fifth throttle element 13, the sixth throttle element 14, and the seventh throttle element 15. The rectification device 3 includes a rectification tower and an overhead heat exchanger connected to the top of the rectification section of the rectification tower. Both the first heat exchanger 6 and the second heat exchanger 7 are provided with a refrigerant pipe and a raw gas liquefaction pipe, and a plurality of feeding or discharging ports communicating with the inner cavity are provided on the outer wall. The third heat exchanger 8 is provided with a raw material gas liquefaction pipeline, and the outer wall...

Embodiment 2

[0040] The only difference from Embodiment 1 is that a filter dryer 4 and a bottom heat exchanger 5 are provided between the bottom of the rectification tower and the fifth throttling element 13 or the sixth throttling element 14 or the seventh throttling element 15. . Among them, the liquid outlet 3b at the bottom of the rectification tower of the rectification device 3 is first connected to the inlet 4a of the filter drier 4, and the outlet 4b of the filter drier 4 is connected to one of the pipes in the bottom heat exchanger 5. The inlet end 5a is connected, and the outlet end 5b of the pipeline is respectively connected to the inlet of the fifth throttle element 13 or the sixth throttle element 14 or the seventh throttle element 15; there is another inside the bottom heat exchanger 5 The inlet end 5c of a pipe is connected, and the outlet end 5d of the pipe is connected with the suction port 1a of the compressor 1; the inlet ends 5a and 5c of the two pipes in the bottom hea...

Images