Liquefied natural gas (LNG) low-temperature liquefied primary refrigerating four-stream spiral twined pipe type heat exchange equipment
A technology of spiral winding and tubular heat exchange, which is applied in the field of LNG low-temperature liquefaction primary refrigeration four-stream spiral winding tubular heat exchange equipment, which can solve the problem of heat exchanger scrapping, processing and manufacturing, inconvenient on-site installation and transportation, and complete sets of process equipment. Discontinuation and other issues
A technology of spiral winding and tubular heat exchange, which is applied in the field of LNG low-temperature liquefaction primary refrigeration four-stream spiral winding tubular heat exchange equipment, which can solve the problem of heat exchanger scrapping, processing and manufacturing, inconvenient on-site installation and transportation, and complete sets of process equipment. Discontinuation and other issues
CN102455113AInactive Publication Date: 2012-05-16张周卫
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[0015] 36°C, 0.9MPa C4H separated from the mid-stage condensation of the mixed refrigerant compressor 10 — Different C 4 h 10 The mixed refrigerant enters the tube box 25 and is distributed in the tube box 25 at C 4 h 10 — Different C 4 h 10 C 3 h 8 、C 4 h 10 — Different C 4 h 10 , The -63°C, 0.3MPa N that enters the shell from the connecting pipe 1 2 —CH 4 —C 2 h 4 The mixed gas is supercooled, the temperature drops to -53°C, the pressure drops to 0.6MPa, and then flows to the pipe box 6, and the throttle valve installed between the connecting pipe 5 and the connecting pipe 2 is throttled into a supercooled liquid, and the pressure after throttling down to 0.3MPa, the temperature becomes -52.85°C, and then enters the cylinder 14 through the connecting pipe 2, and the throttled C 3 h 8 , N entering the shell from the connecting pipe 1 2 —CH 4 —C 2 h 4 The mixed gas is mixed, and after mixing, it flows downward to cool the natural gas tube bundle 39, N 2 —C...
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The invention belongs to the technical field of liquefied natural gas (LNG) low-temperature liquefaction, and relates to LNG primary low-temperature refrigerating equipment and a mixed refrigerant refrigerating technology. Natural gas at the temperature of 36 DEG C and under the pressure of 6.1MPa is cooled so as to enter a secondary pre-cooling stage at the temperature of 53 DEG C below zero in a four-stream spiral twined pipe type heat exchanger by using a refrigerant of C3H8 and C4H10-iso-C4H10 and an N2-CH4-C2H4 mixed gas under the pressure of 0.3MPa and at the temperature of 63 DEG C below zero at an LNG secondary outlet; and the C3H8 and the C4H10-iso-C4H10 are sub-cooled by using the twined pipe type heat exchanger, throttled to a shell pass and mixed with the N2-CH4-C2H4 to pre-cool a natural gas pipe bundle, an N2-CH4-C2H4 pipe bundle, a sub-cooling C3H8 pipe bundle and a C4H10-iso-C4H10 pipe bundle, so that the aims of primary natural gas pre-cooling, N2-CH4-C2H4 mixed gas pre-cooling and sub-cooling before the C3H8 and the C4H10-iso-C4H10 are throttled are fulfilled. The equipment has a compact structure and high heat exchange efficiency, can be applied in the field of phase change low-temperature heat exchange of gas zones at the temperature of between 36 DEG C and 53 DEG C below zero, solves the technical problem of primary refrigeration of LNG, and improves the low-temperature heat exchange efficiency of an LNG system.
Description
technical field [0001] The invention belongs to the technical field of low-temperature liquefaction of natural gas, and relates to LNG primary low-temperature refrigeration equipment and mixed refrigerant refrigeration technology. 3 h 8 、C 4 h 10 — Different C 4 h 10 Refrigerant and LNG secondary outlet 0.3MPa, N at -63°C 2 —CH 4 —C 2 h 4 The mixed gas cools the 36°C, 6.1MPa natural gas to -53°C in the four-stream spiral wound tube heat exchanger to enter the secondary pre-cooling section; the wound tube heat exchanger is used to supercool C 3 h 8 、C 4 h 10 — Different C 4 h 10 , then throttling to the shell side and N 2 —CH 4 —C 2 h 4 Pre-cooled natural gas tube bundle after mixing, N 2 —CH 4 —C 2 h 4 Tube bundle, supercooled C 3 h 8 Bundle and C 4 h 10 — Different C 4 h 10 Tube bundle, to achieve first-level natural gas precooling, mixed gas N 2 —CH 4 —C 2 h 4 pre-cooling and C 3 h 8 、C 4 h 10 — Different C 4 h 10 The purpose of subcoolin...
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Patent Timeline
16 May 2012
Publication
CN102455113A
- IPC
- F25J5/00
- Inventors
- 张周卫; 汪雅红