Liquefied natural gas receiving station evaporation gas direct output process and device

A technology of liquefied natural gas and boil-off gas, which is applied in fixed-capacity gas storage tanks, gas/liquid distribution and storage, pressure vessels, etc., can solve the problems of wasting high-pressure liquefied natural gas pressure and reduce high-pressure natural gas, and achieve outstanding energy-saving effects and energy The effect of low consumption and good application prospects

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the pressure of high-pressure natural gas is re

Method used

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  • Liquefied natural gas receiving station evaporation gas direct output process and device
  • Liquefied natural gas receiving station evaporation gas direct output process and device

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0057] Example 1

[0058] Example 1 adopts figure 1 The process shown. Among them, the BOG compressor is driven by the expander.

[0059] In a certain LNG receiving station, 9MPa natural gas is supplied to high-pressure natural gas users. The molar composition of LNG is as follows: methane 88.77%, ethane 7.54%, propane 2.59%, isobutane 0.45%, n-butane 0.56%, and nitrogen 0.08%. With 2 seats 16×10 4 m 3 The LNG storage tank has a boiling point of -162℃ under normal pressure and a density of 456kg / m 3 As an example, the total amount of cargo stored in each storage tank (assuming that the storage tank is full) is 72960t. The daily evaporation of the storage tank is less than 0.05%, so the amount of evaporated gas produced in the two storage tanks is 3.04t / h. The operating pressure of the storage tank is 0.150 MPa, and the export volume of LNG is 200 t / h. The LNG is pressurized to 1.1 MPa by the low-pressure submersible pump and enters the buffer tank. According to the calculation by...

Example Embodiment

[0061] Example 2

[0062] Example 2 adopts figure 1 The process shown.

[0063] In a certain LNG receiving station, 8MPa natural gas is supplied to high-pressure natural gas users and 4MPa natural gas is supplied to medium and high-pressure users. The molar composition of LNG is as follows: methane 88.77%, ethane 7.54%, propane 2.59%, isobutane 0.45%, normal Butane 0.56%, nitrogen 0.08%. With 2 seats 16×10 4 m 3 The LNG storage tank has a boiling point of -162℃ under normal pressure and a density of 456kg / m 3 As an example, the total amount of cargo stored in each storage tank (assuming that the storage tank is full) is 72960t. The daily evaporation of the storage tank is less than 0.05%, so the amount of evaporated gas produced in the two storage tanks is 3.04t / h. The operating pressure of the storage tank is 0.150MPa, and the output of LNG is 200t / h. The LNG is pressurized to 1.1MPa by the low-pressure submersible pump and enters the buffer tank. According to the calculation by...

Example Embodiment

[0065] Example 3

[0066] Example 3 adopts figure 2 The process shown. Among them, the BOG compressor is driven by the first-stage expander, and the LNG high-pressure pump is driven by the second-stage expander.

[0067] In a certain LNG receiving station, 6MPa natural gas is supplied to high-pressure natural gas users and 5MPa natural gas is supplied to medium and high-pressure users. The molar composition of LNG is as follows: methane 88.77%, ethane 7.54%, propane 2.59%, isobutane 0.45%, normal Butane 0.56%, nitrogen 0.08%. With 2 seats 16×10 4 m 3 The LNG storage tank has a boiling point of -162℃ under normal pressure and a density of 456kg / m 3 As an example, the total amount of cargo stored in each storage tank (assuming that the storage tank is full) is 72960t. The daily evaporation of the storage tank is less than 0.05%, so the amount of evaporated gas produced in the two storage tanks is 3.04t / h. The operating pressure of the storage tank is 0.150 MPa, and the export vo...

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Abstract

The invention discloses a liquefied natural gas receiving station evaporation gas direct output process. Based on a traditional BOG direct output process, LNG is pressurized; the pressurized LNG is gasified to enter a turbine expander for doing work by expansion; the part of power is used for driving a BOG compressor and an LNG high-pressure pump; and meanwhile, medium/high-pressure natural gas and high-pressure natural gas are output outwards. The method can fully use cold energy generated in the vaporization process of high-pressure liquefied natural gas to reduce total energy consumption of a receiving station.

Description

technical field [0001] The invention relates to a low energy consumption BOG (boil-off gas) direct output process and output device of an LNG (liquefied natural gas) receiving station. Background technique [0002] The LNG receiving station generally refers to the LNG gasification plant built on the seashore in order to receive LNG transported by sea. It unloads, stores, and BOG gasifies the LNG transported by ocean-going transport ships, and then transports the LNG gasification to users and projects. Wait. Due to the input of external energy, such as the operation of the pump, the leakage of heat from the surrounding environment, changes in atmospheric pressure, and environmental influences, the liquefied natural gas at extremely low temperature will be heated and evaporated to produce boil-off gas. The vapor pressure in the storage tank is very low, and it needs to be pressurized to enter the system, resulting in high energy consumption. However, when the internal pressu...

Claims

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Application Information

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IPC IPC(8): F17C13/02F17C7/04F17D3/01
Inventor 薛倩刘名瑞肖文涛李雪
Owner CHINA PETROLEUM & CHEM CORP
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