Minitype skid-mounted single-level mixed refrigerant natural gas liquefaction system and method thereof

A mixed refrigerant and natural gas technology, which is applied in refrigeration and liquefaction, liquefaction, gas fuel, etc., can solve the problems of complex process, multiple equipment, and large differences in biogas and natural gas components, and achieve simple process, low energy consumption, and convenient equipment The effect of prying

Active Publication Date: 2013-10-23
合肥万豪能源设备有限责任公司
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  • Abstract
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  • Application Information

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Problems solved by technology

However, for small skid-mounted natural gas liquefaction plants, the mixed refrigerant liquefaction process is relatively complicated
In the existing technology, the patent publication number CN102477327A, the patent titled "a small and medium-sized natural gas liquefaction process", discloses a small and medium-sized natural gas liquefaction process. In this process, the mixed refrigerant adopts two-stage gas-liquid separation, and there are three Heat exchanger, the process is more complicated, not suitable for small skid

Method used

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  • Minitype skid-mounted single-level mixed refrigerant natural gas liquefaction system and method thereof

Examples

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Effect test

Embodiment 1

[0051] Natural gas molar composition 92% CH 4 +4%C 3 h 8 +4%N 2 , pressure 1.2MPa, temperature 30°C, flow rate 1kmol / h; mixed refrigerant flow rate 2.84kmol / h. The specific steps of the small skid-mounted single-stage mixed refrigerant natural gas liquefaction process are as follows:

[0052] 1. Natural gas raw material is compressed to 2.8MPa by two-stage compressors (first-stage compressor 1, natural gas second-stage compressor 3), and then passed through coolers (natural gas first-stage cooler 2, natural gas second-stage water cooler 4) Cool to 40°C;

[0053] 2. The natural gas cooled in step 1 enters deacidification tower 5 and dehydration tower 6 to remove CO 2 , H 2 S, H 2 O and other impurities;

[0054] 3. The natural gas purified in step 2 is cooled to -60°C (heavy hydrocarbon separation temperature) through the first stage heat exchanger 7 and then enters the heavy hydrocarbon separator 8 to obtain heavy hydrocarbons from the bottom;

[0055] 4. The natural ...

Embodiment 2

[0065] Natural gas molar composition 90% CH 4 +6%C 3 h 8 +4%N 2 , pressure 1.7MPa, temperature 25°C, flow rate 1kmol / h, mixed refrigerant flow rate 2.79kmol / h. The specific steps of the small skid-mounted single-stage mixed refrigerant natural gas liquefaction process are as follows:

[0066] 1. Natural gas raw material is compressed to 2.8MPa by two-stage compressors (first-stage compressor 1, natural gas second-stage compressor 3), and then passed through coolers (natural gas first-stage cooler 2, natural gas second-stage water cooler 4) Cool to 40°C;

[0067] 2. The natural gas cooled in step 1 enters deacidification tower 5 and dehydration tower 6 to remove CO 2 , H 2 S, H 2 O and other impurities;

[0068] 3. The natural gas purified in step 2 is cooled to -60°C (heavy hydrocarbon separation temperature) through the first stage heat exchanger 7 and then enters the heavy hydrocarbon separator 8 to obtain heavy hydrocarbons from the bottom.

[0069] 4. The natural ...

Embodiment 3

[0079] Natural gas molar composition 80% CH 4 +6%C 3 h 8 +14%N 2 , pressure 2.8MPa, temperature 20°C, flow rate 1kmol / h, mixed refrigerant flow rate 2.85kmol / h. The specific steps of the small skid-mounted single-stage mixed refrigerant natural gas liquefaction process are as follows:

[0080] 1. The raw material pressure of natural gas reaches 2.8MPa, so the natural gas compression link can be omitted;

[0081] 2. Natural gas enters deacidification tower 5 and dehydration tower 6 to remove CO 2 , H 2 S, H 2 O and other impurities;

[0082] 3. The natural gas purified in step 2 is cooled to -60°C (heavy hydrocarbon separation temperature) through the first stage heat exchanger 7 and then enters the heavy hydrocarbon separator 8 to obtain heavy hydrocarbons from the bottom.

[0083] 4. The natural gas after removing heavy hydrocarbons in step 3 is cooled to -159°C through the second stage heat exchanger 9;

[0084] 5. The natural gas obtained in step 4 passes through a...

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Abstract

The invention discloses a minitype skid-mounted single-level mixed refrigerant natural gas liquefaction system and a method thereof. The method comprises the steps that natural gas is compressed and cooled by a natural gas supercharge skid; impurities are removed from the natural gas by a deacidification and dehydration skid; the natural gas is cooled by a first stage heat exchanger, then enters a heavy hydrocarbon separator, is cooled and liquefied by a second stage heat exchanger after heavy hydrocarbon is removed, and enters a liquefied natural gas separator after depressurized to liquefied natural gas storage pressure by a throttling valve, so as to form liquefied natural gas; flash steam returns to the heat exchangers to provide cooling capacity; a mixed refrigerant enters a second stage gas-liquid separator after supercharged and cooled by a mixed refrigerant compression skid; the gas phase refrigerant is throttled and cooled after cooled by the two heat exchangers, and provides the cooling capacity for the second stage heat exchanger; and the liquid phase refrigerant is throttled and cooled by the throttling valve after cooled by the first stage heat exchanger, and mixed with the refrigerant from the second stage heat exchanger to provide the cooling capacity for the first stage heat exchanger. The system and the method are simple in a liquefaction process flow and low in energy consumption, facilitate the equipment skidding, and have better adaptability to different gas sources simultaneously.

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 single-stage mixed refrigerant natural gas liquefaction system and a method thereof. 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 ...

Claims

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Application Information

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IPC IPC(8): F25J1/02C10L3/10
CPCF25J1/0259F25J1/0022F25J1/004F25J1/0055F25J1/0212F25J1/0291F25J2220/62F25J2220/64
Inventor 巨永林贺天彪
Owner 合肥万豪能源设备有限责任公司
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