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
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  • 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

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  • Pressure energy recovery method by liquefied natural gas plant

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Example Embodiment

[0022] [Example 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 of the present invention is adopted. The composition of raw natural gas is shown in Table 2.

[0024] Table 2 List of raw natural gas composition

[0025] component name

[0026] like figure 1 As shown, the technological process is as follows: the high-pressure lean liquid enters the acid impurity absorption tower 1 to absorb the acid impurity 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 desorbed from the rich liquid desorption tower. The low-pressure lean liquid from 3 carries out pressure energy conversion and recovers pressure energy, and the pressure of the high-pressure rich liquid decreases, and ...

Example Embodiment

[0028] [Example 2]

[0029] The 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 device, and the composition of the raw natural gas is changed, as shown in Table 3.

[0030] Table 3 List of raw natural gas composition

[0031] component name

[0032] Due to the method for recovering the pressure energy of the liquefied natural gas device 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 device The efficiency is 61.82%, and the electricity cost is saved by 167,800 yuan per year. Other technical effects and economic benefits are shown in Table 6. After that, the methane gas is fur...

Example Embodiment

[0033] [Example 3]

[0034] Same as [Example 1], the process operation parameters are unchanged, the composition of raw natural gas is also unchanged, only the processing capacity is expanded to 500,000 standard cubic meters / hour LNG liquefied natural gas device. Due to the method for recovering the pressure energy of the liquefied natural gas device 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 device 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 standard required by the process, and the liquefied natural gas LNG product is produc...

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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

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Application Information

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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
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