Miniature skid type nitrogen expansion natural gas liquefaction system and method thereof

A natural gas and skid-mounted technology, which is applied in liquefaction, refrigeration and liquefaction, gas fuel, etc., can solve the problems of complex devices and miniaturization without using equipment, achieve low energy consumption for liquefaction, facilitate equipment prying, and simplify the process Effect

Active Publication Date: 2014-06-18
合肥万豪能源设备有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the patent number (publication number) CN1908558A, the invention patent titled "Small Natural Gas Liquefaction Plant Utilizing Air Separation Refrigeration System", utilizes the nitrogen produced by the refrigeration system of the air separation plant as the refrigerant of the natural gas liquefaction plant. The advantages are There is no need to purchase additional nitrogen, but the disadvantage is that the device is complicated, and the miniaturization and skid-mounting of the equipment are not used.

Method used

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  • Miniature skid type nitrogen expansion natural gas liquefaction system and method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 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, the specific steps of the small skid-mounted nitrogen expansion natural gas liquefaction process are as follows:

[0042] 1. Natural gas is compressed to 2.85MPa by two-stage compressors (natural gas first-stage compressor 1, natural gas second-stage compressor 3), and then passes through coolers (natural gas first-stage cooler 2, natural gas second-stage water cooler 4) Cool to 40°C;

[0043] 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;

[0044] 3. The natural gas purified in step 2 is cooled to -60°C (i.e., the 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;

[0045] 4. The natural gas after the removal of heavy hydrocarbon...

Embodiment 2

[0053] 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, the specific steps of the small skid-mounted nitrogen expansion natural gas liquefaction process are as follows:

[0054] 1. Natural gas is compressed to 2.85MPa by two-stage compressors (natural gas first-stage compressor 1, natural gas second-stage compressor 3), and then passes through coolers (natural gas first-stage cooler 2, natural gas second-stage water cooler 4) Cool to 40°C;

[0055] 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;

[0056] 3. The natural gas purified in step 2 is cooled to -60°C (i.e., the 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;

[0057] 4. The natural gas after the removal of heavy hydrocarbon...

Embodiment 3

[0065] 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, the specific steps of the small skid-mounted nitrogen expansion natural gas liquefaction process are as follows:

[0066] 1. The natural gas pressure reaches 2.8MPa, so step 1 can be omitted;

[0067] 2. Natural gas 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 (ie, the 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 gas after the removal of heavy hydrocarbons in step 3 is cooled to -153°C through the second stage heat exchanger 9;

[0070] 5. The natural gas obtained in step 4 passes through a throttling valve 10, and after throttling and reducing the pressure to 0.30 MPa,...

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Abstract

The invention discloses a miniature skid type nitrogen expansion natural gas liquefaction system and method thereof. Natural gas is supercharged by a natural gas supercharging prying block and cooled, and enters into a natural gas depickling and dehydrating prying block for removing impurity, and is cooled by a first stage heat exchanger and then enters into a heavy hydrocarbon separator, thereby obtaining a heavy hydrocarbon from the bottom; after the heavy hydrocarbon is removed, the natural gas is cooled by a second stage heat exchanger for liquefaction; after pressure of a throttle valve is reduced to the storage pressure of the liquefied natural gas, the natural gas enters into a natural gas liquefaction separator for obtaining a liquefied natural gas, and a flash evaporation gas returns to the heat exchanger for providing cooling capacity. A nitrogen is supercharged and cooled by a nitrogen compression prying block, and is supercharged and cooled by a two-stage supercharger, and then enters into the first stage heat exchanger for precooling; after precooling, the nitrogen is expanded and refrigerated by the two-grade expander and providing a cooling capacity for liquefaction of natural gas. The miniature skid-mounted type nitrogen expansion natural gas liquefaction has the advantages of simple flow, fast starting and convenient maintenance, and is convenient for prying equipment with low energy consumption, and simultaneously has better adaptability for different gas sources.

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 nitrogen expansion 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 other hand, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/10F25J1/02F25J3/00
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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