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Liquefied natural gas flash gas constant pressure recovery method and equipment

A liquefied natural gas and recovery method technology, applied in the field of constant pressure recovery of liquefied natural gas flash gas, can solve problems such as system overpressure and increased chance of venting, decreased operating economy of receiving stations, and increased cost of flash gas treatment, etc., to reduce noise and Effects of vibration, avoiding overpressure alarm and cold and heat air defense, and improving recovery efficiency

Active Publication Date: 2016-06-15
CHINA NAT OFFSHORE OIL CORP +1
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AI Technical Summary

Problems solved by technology

This will increase the load of the cryogenic compressor, increase the probability of system overpressure and venting, increase the cost of flash gas treatment, and reduce the operating economy of the receiving station, bringing operational and safety hazards

Method used

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  • Liquefied natural gas flash gas constant pressure recovery method and equipment

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Embodiment 1

[0028] A liquefied natural gas peak shaving station has an annual production capacity of 2 million tons. It uses a recondenser pressure vessel with a processing capacity of about 10 tons per hour. It uses compressed flash gas and supercooled liquefied natural gas in a structured packed bed without nitrogen supplementary pressure. The external gas is depressurized to about 1 MPa and returned to the input pressure vessel to make up the pressure. Due to the high-pressure gas make-up, the LNG is in a supersaturated state. After entering the subsequent process, it is quickly released again, and is collected by the air defense pipeline to the evaporation gas main pipe to form evaporation. In addition, due to the vibration caused by the flash gas dissolution process inside the pressure vessel, the internal parts, nozzles and auxiliary structures need to be maintained for three months, resulting in production shutdown losses. The above-mentioned total annual loss is about 25 million yu...

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Abstract

The invention provides a method and a device applied to constant-pressure recovery of liquefied natural gas flash steam. The method comprises the following steps: feeding supercooled and liquefied natural gas by a low-temperature storage tank and introducing the supercooled and liquefied natural gas into a low-temperature pressure container to arrive at a filler bed; boosting the liquefied natural gas flash steam generated in the low-temperature storage tank by a low-temperature compressor and feeding the liquefied natural gas flash steam into the filler bed of the low-temperature pressure container; exchanging heat of the liquefied natural gas flash steam introduced into the low-temperature pressure container and the supercooled and liquefied natural gas by virtue of materials of the filler bed, and instantly dissolving the liquefied natural gas flash steam in supercooled and liquefied natural gas in the unsaturated state; feeding high-pressure nitrogen into the low-temperature pressure container to enable the pressure to be constant; converting all the liquefied natural gas flash steam from gaseous state into liquid state, and enabling all the liquefied natural gas in the process of dissolving the liquefied natural gas flash steam to flow out of the low-temperature pressure container and enter subsequent technical processes. The device comprises a low-temperature pressure container, wherein the low-temperature pressure container is internally provided with the filler bed. The device is stable in running, high in safety and low in emission; the vibration noise is reduced; the operation cost is lowered.

Description

technical field [0001] The invention relates to a constant-pressure recovery method and equipment for liquefied natural gas flash gas. Background technique [0002] At present, coal and oil are still the main energy consumption of human beings. In the primary energy consumption structure, coal accounts for 68.5%, oil accounts for 17.7%, and natural gas accounts for only 4.7%, which is far lower than the world average of 24%. This coal-based energy consumption structure will bury hidden dangers in the atmospheric environment. Liquefied natural gas (LNG) is the best storage form of natural gas. Under the current situation of increasingly stringent environmental protection requirements, for the technology-intensive LNG industry, the research and development of LNG-related technologies, especially LNG storage-related technologies, are of great importance to the development of the LNG industry. It has important social and economic benefits. [0003] The liquefied natural gas in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17C1/00F17C13/02
Inventor 韩冬杨公升杨云籍荣张定国杨尚玉苏健张宝和周福诞孙瑜孟术歧
Owner CHINA NAT OFFSHORE OIL CORP
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