Recovery method of pressure energy in LNG plant
A technology of liquefied natural gas and pressure, applied in chemical instruments and methods, separation methods, gas fuels, etc., can solve problems such as long process flow, high project investment, and large number of equipment
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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 desorption tower The low-pressu...
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 methane carbon two carbon three heavy component Non-condensable hydrogen sulfide carbon dioxide total Yield / mol% 93.914 0.621 0.079 0.021 0.181 0.048 5.136 100.00
[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 effic...
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.
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Abstract
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