Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Pressure energy recovery method by liquefied natural gas plant

A technology of liquefied natural gas and a recovery method, which is applied in the field of pressure energy recovery of liquefied natural gas devices, can solve the problems of large number of equipment, long process flow and high engineering investment, and achieves the effects of saving electricity costs, simple mechanical structure and good technical effect.

Active Publication Date: 2019-01-11
SINOPEC SHANGHAI ENG +1
View PDF12 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problems in the prior art that the process flow is long, the number of equipment is large, the project investment is high, and the energy recovery rate is low. A new method for recovering the pressure energy of the liquefied natural gas device is provided, which has the advantages of short process flow, The advantages of less equipment, low engineering investment and high energy recovery rate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pressure energy recovery method by liquefied natural gas plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Taking an LNG liquefied natural gas plant with a processing capacity of 10,000 standard cubic meters per hour as an example, a method for recovering pressure energy of a liquefied natural gas plant according to the present invention is adopted, and the composition of raw natural gas is shown in Table 2.

[0024] Table 2. List of composition of raw natural gas

[0025] component name

methane

hydrogen

carbon monoxide

Nitrogen

hydrogen sulfide

carbon dioxide

total

Yield / mol%

93.25

1.08

0.01

5.14

0.01

0.51

100.00

[0026] Such as figure 1 As shown, the process flow is as follows: the high-pressure lean liquid enters the acidic impurity absorption tower 1 to absorb the acidic impurities hydrogen sulfide H2S and carbon dioxide CO2 in the raw methane gas to form a high-pressure rich liquid, and the high-pressure rich liquid enters the online pressure recovery device 4 and is separated from the rich liquid de...

Embodiment 2

[0029] Same as [Example 1], the process operation parameters remain unchanged, only the processing capacity is expanded to 100,000 standard cubic meters per hour LNG liquefied natural gas plant, and the raw material natural gas composition is changed, as shown in Table 3.

[0030] Table 3. List of composition of raw natural gas

[0031] component name

[0032] Due to the adoption of the pressure energy recovery method of the liquefied natural gas plant of the present invention, in the process of removing the acidic impurities hydrogen sulfide H2S and carbon dioxide CO2 in the methane gas, the energy conversion efficiency of the online pressure recovery device 4 is 82.32%, and the energy recovery of the absorption-desorption system of the liquefied natural gas plant The efficiency is 61.82%, and the electricity cost is saved by 167,800 yuan / year. Other technical effects and economic benefits are shown in Table 6. After that, the methane gas is further condensed and li...

Embodiment 3

[0034] Same as [Example 1], the process operation parameters remain unchanged, and the composition of raw natural gas remains unchanged, only the processing capacity is expanded to 500,000 standard cubic meters per hour LNG liquefied natural gas plant. Due to the adoption of the pressure energy recovery method of the liquefied natural gas plant of the present invention, in the process of removing the acidic impurities hydrogen sulfide H2S and carbon dioxide CO2 in the methane gas, the energy conversion efficiency of the online pressure recovery device 4 is 84.98%, and the energy recovery of the absorption-desorption system of the liquefied natural gas plant The efficiency is 63.08%, and the electricity cost is saved by 809,500 yuan / year. Other technical effects and economic benefits are shown in Table 6. After that, the methane gas is further condensed and liquefied to meet the quality standards required by the process, and liquefied natural gas (LNG) products are produced.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a pressure energy recovery method by a liquefied natural gas plant. The problems in the prior art such as long technical process, great equipment quantity, high engineering investment and low energy recovery rate are mainly solved. According to the pressure energy recovery method by the liquefied natural gas plant, disclosed by the invention, an online pressure recovery unit is arranged between an acidic impurity absorption tower and a pregnant solution desorber. By virtue of mechanical energy of the rotating shaft of equipment, the pressure of a high-pressure pregnantsolution can be directly converted into pressure energy of low-pressure barren liquor, and the online pressure recovery unit is simple in mechanical structure, safe, stable and reliable. According tothe technical scheme, the previous problem is well solved, and the pressure energy recovery method can be applied to the liquefied natural gas plant.

Description

technical field [0001] The invention relates to a method for recovering pressure energy of a liquefied natural gas device. Background technique [0002] Natural gas is a widely used high-quality, clean, efficient and cheap fossil energy, and it is also a valuable and important chemical raw material. In the national economy, the economic value and environmental protection benefits of natural gas are very attractive. During the transportation and storage of natural gas from the wellhead of the gas source to the end user, compressed natural gas (CNG) or liquefied natural gas (LNG) is usually used to reduce the volume of natural gas to facilitate transportation and storage. Among them: the storage and transportation conditions of liquefied natural gas are -162°C and 0.1MPa, its relative density is 72% of gasoline, and the volume per unit mass is less than 1 / 600 of the volume of methane gas under standard conditions, which is very conducive to transportation and storage. Therefo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01D53/14C10L3/10
CPCB01D53/1468B01D53/1475B01D2252/20484B01D2256/245C10L3/103C10L3/104C10L2290/541
Inventor 李勇王江义吕世军唐绮颖何琨
Owner SINOPEC SHANGHAI ENG
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com