Re-liquefying method for shipping liquefaction ethylene/ethane vaporized gas
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A technology for evaporating gas and liquefying ethylene, applied in liquefaction, refrigeration, liquefaction, solidification, etc.
Inactive Publication Date: 2010-09-01
SOUTH CHINA UNIV OF TECH
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In addition, in the R22 condenser in the reliquefaction process of the device, the cooling of the refrigerant basically depends on seawater, and the heat exchange load is large, which increases the investment cost
And due to the limitation of the imported seawater temperature, the cooling temperature of the refrigerant is also restricted
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Embodiment 1
[0043] Embodiment one: reliquefaction of liquid ethylene BOG
[0044] Two-stage compression of ethylene BOG in the first step
[0045] The 1500Kg / hr, -102.0°C, 0.11MPa ethylene BOG gas evaporated from the ship's ethylene liquid cargo tank enters the primary compressor 1 and is compressed to 0.52MPa, and the temperature rises from -102°C to -0.7°C. The ethylene BOG from the outlet of the first-stage compressor is mixed with the return gas S3 and S5 of the subsequent process, cooled to -13.1°C, and entered into the second-stage compressor 2 for compression, the pressure rises to 1.72MPa, and the temperature is 83.9°C.
[0046] The second step is the cooling of ethylene BOG
[0047] The cooling device includes a seawater heat exchanger 3 and an ethylene condenser 4; the high-temperature and high-pressure ethylene gas compressed in two stages first enters the seawater heat exchanger 3 and exchanges heat with seawater. The temperature drops from 83.9°C to 38°C, and the pressure dr...
Embodiment 2
[0061] Embodiment two: reliquefaction of liquid ethane BOG
[0062] Step 1 Two-stage compression of ethane gas
[0063] The 1480Kg / hr, -85.0°C, 0.12MPa ethane BOG evaporated from the ship's ethane liquid cargo tank enters the primary compressor 1 and is compressed to 0.56MPa, and the temperature rises from -85.0°C to 2.8°C. The ethane BOG from the outlet of the primary compressor is mixed with the return gas S3 and S5 of the subsequent process, cooled to -6.1°C, and enters the secondary compressor 2, the pressure rises to 1.86MPa, and the temperature is 75.4°C.
[0064] Step 2 Cooling of Ethane BOG
[0065] The cooling device includes a seawater heat exchanger 3 and an ethane condenser 4; the high-temperature and high-pressure ethane gas compressed in two stages first enters the seawater heat exchanger 3 and exchanges heat with seawater. The temperature drops from 75.4°C to 40°C, and the pressure drop It is 1.82MPa. Then enter the ethane condenser 4 to exchange heat with re...
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Abstract
The invention relates to a reliquefying method for shipped liquefied ethylene / ethane vapor. The method comprises the following steps of two stage compression of the ethylene / ethane vapor, successive cooling of the ethylene / ethane vapor by seawater and a refrigerant, phase-change latent heat cooling of ethylene / ethane, and re-liquefied storage of the ethylene / ethane vapor in a tank. The method utilizes phase-change latent heat of the ethylene / ethane and the refrigerant for heat exchange, supplies the cooling capacity through cycle refrigeration of the refrigerant, and re-liquefies and recoversthe ethylene / ethane vapor. In the refrigeration cycle of the method, low-temperature return flow is mixed and returned to a cold box so as to cool the refrigerant, so that the method fully utilizes the cooling capacity of the return flow, and improves the recovery utilization rate of energy; and the temperature difference of seawater of the technological method before and after heat exchange accords with the environmental protection rule.
Description
technical field [0001] The invention relates to the technical field of reliquefaction of boil-off gas (BOG) of liquefied petrochemical products, and specifically refers to a method for reliquefaction of BOG generated by heat during transportation and unloading when liquefied ethylene or ethane is shipped. Background technique [0002] The ethylene industry is a symbol to measure the scale and development of a country's petrochemical industry. No matter whether it is a developed country or a developing country, all conditions will try their best to promote the construction and development of the ethylene industry. With the sustained and rapid development of my country's petrochemical industry and national economy, the demand for ethylene continues to increase. In 2007, my country's ethylene consumption was 21.69 million tons, while ethylene production was 10.47 million tons, and the self-sufficiency rate was only 48.3%. It is estimated that my country's ethylene production c...
Claims
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