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Small-sized skid-mounted mixed refrigerant natural gas liquefaction and NGL (Natural Gas Liquid) recovery integrated system

A technology of mixing refrigerant and natural gas, applied in refrigeration and liquefaction, liquefaction, cold treatment separation, etc., can solve the problems of torch venting, distance from the gas supply pipe network, unreasonable economy, etc., and achieves low overall energy consumption and convenient equipment. , the effect of strong adaptability

Active Publication Date: 2014-06-18
科霖恩新能源科技(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On the other hand, there are a large number of marginal gas fields, associated gas fields, and coalbed methane fields with small production and reserves in my country. The single well reserves are small, and the distance from the gas supply pipeline network is far away. The pipeline transportation method has not been effectively developed due to economic unreasonableness. Utilized, has long been flared to vent

Method used

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  • Small-sized skid-mounted mixed refrigerant natural gas liquefaction and NGL (Natural Gas Liquid) recovery integrated system

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Experimental program
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Effect test

Embodiment 1

[0035] Natural gas molar composition 67.21% CH 4 +14.23%C 2 h 6 +9.36%C 3 h 8 +2.79% i-C 4 h 10 +3.32%n-C 4 h 10 +0.07% i-C 5 h 12 +0.06%n-C 5 h 12 +0.04C 6 h 14 +2.92%N 2 , pressure 5.04MPa, temperature 40℃, flow rate 83.92kmol / h, the specific steps of the integrated process of small skid-mounted mixed refrigerant natural gas liquefaction and NGL recovery are as follows:

[0036] 1. The raw natural gas enters the three-phase separator 11 after being cooled to -10°C in the first-stage heat exchanger 10, and the gas phase coming out of the top of the three-phase separator 11 continues to pass through the second-stage heat exchanger 14 and the third-stage heat exchanger 19 and liquefied after being cooled to -160°C in the fourth stage heat exchanger 21;

[0037] 2. The natural gas cooled and liquefied in step 1 enters the cryogenic rectification skid, and enters the cryogenic rectification tower 25 after being throttled to 450kPa by the natural gas throttling devi...

Embodiment 2

[0048] Natural gas molar composition 77.16% CH 4 +12.51%C 2 h 6 +4.42%C 3 h 8 +0.07% i-C 4 h 10 +0.09%n-C 4 h 10 +0.02% i-C 5 h 12 +0.02%n-C 5 h 12 +0.01C 6 h 14 +3.80%N 2 , pressure 5.00MPa, temperature 45°C, flow rate 90.82kmol / h, the specific steps of the integrated process of small skid-mounted mixed refrigerant natural gas liquefaction and NGL recovery are as follows:

[0049] 1. The raw natural gas is cooled to -20°C by the first-stage heat exchanger 10 and enters the three-phase separator 11, and the gas phase coming out of the top of the three-phase separator 11 continues to pass through the second-stage heat exchanger 14 and the third-stage heat exchanger 19 and liquefied after being cooled to -160°C in the fourth stage heat exchanger 21;

[0050] 2. The natural gas cooled and liquefied in step 1 enters the cryogenic rectification skid, and enters the cryogenic rectification tower 25 after being throttled to 450kPa by the natural gas throttling device 2...

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Abstract

The invention discloses a small-sized skid-mounted mixed refrigerant natural gas liquefaction and NGL (Natural Gas Liquid) recovery integrated system. The system consists of a natural gas liquefaction module, a mixed refrigerant circulating module and an NGL recovery module, wherein the natural gas liquefaction module comprises a liquefaction cold box skid block, a low-temperature rectification skid block and a natural gas storage skid block which are sequentially connected; the mixed refrigerant circulating module comprises a mixed refrigerant compression skid block, a second-stage gas-liquid separator, a second-stage mixer, a first-stage refrigerant throttling device and a second-stage refrigerant throttling device; the NGL recovery module comprises a demethanation tower, a deethanization tower and a liquefied gas tower. The small-sized skid-mounted mixed refrigerant natural gas liquefaction and NGL recovery integrated system disclosed by the invention has the advantages that the process flow is simple, the system is quick to start, the maintenance is facilitated, the equipment skid formation is facilitated, the energy consumption is smaller and the adaptability to different gas sources is better.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and cryogenic engineering, and in particular relates to a small skid-mounted mixed refrigerant natural gas liquefaction and NGL recovery integrated system. Background technique [0002] As the main fossil energy in the world, natural gas, oil and coal account for a large proportion of primary energy. Natural gas is a high-quality clean energy, and more and more countries have begun to pay attention to the development and utilization of natural gas resources. [0003] With the continuous optimization of my country's energy structure and the continuous growth of natural gas consumption demand, coupled with the current situation that most of my country's natural gas fields are not large, the gap between my country's natural gas supply and demand is constantly increasing. It is predicted that by 2020 my country's natural gas supply gap will reach 1000×10 8 m 3 . [0004] On the other ...

Claims

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Application Information

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IPC IPC(8): F25J3/02
CPCF25J1/0022F25J1/0055F25J1/0212F25J1/0291F25J2220/64F25J2220/62F25J2290/34F25J2245/02F25J3/0209F25J3/0233F25J3/0238F25J3/0242F25J1/0045F25J2205/04F25J3/0257F25J2200/08F25J2215/04F25J2215/62F25J2270/18F25J2270/66F25J1/0238F25J3/0247
Inventor 巨永林贺天彪
Owner 科霖恩新能源科技(江苏)有限公司
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