Storage tank skid-mounted gas filling device with built-in cryogenic pump

Abstract

The invention discloses a storage tank skid-mounted gas filling device with a built-in cryogenic pump, and relates to the technical field of LNG / LN2 (liquefied natural gas / liquid nitrogen). The storage tank skid-mounted gas filling device with the built-in cryogenic pump comprises a storage tank outer shell, wherein a storage tank inner container is arranged in the storage tank outer shell; a supporting assembly is arranged on the storage tank inner container; the supporting assembly extends into the inner bottom of the storage tank inner container from the outside of the storage tank outer shell; a flange cover is sealed at one end, positioned on the storage tank outer shell, of the supporting assembly; a supporting plate is arranged in the supporting assembly; the supporting plate is connected with an extending pipe assembly; a cryogenic pump placed on the extending pipe assembly extends to the inner bottom of the storage tank inner container; the cryogenic pump is connected with a fixed liquid outlet pipe which extends out of the storage tank shell. The storage tank skid-mounted gas filling device with the built-in cryogenic pump mainly aims to solve the problem of fault phenomenon that liquid cannot be added normally because of the reasons of insufficient liquid taking, unsmooth gas return and the like frequently occurring in an LNG gas filling station, and is suitable for LNG and LN2 (liquid nitrogen).

Description

technical field [0001] The invention relates to LNG / LN2 gas filling equipment, in particular to a skid-mounted gas filling device with a built-in cryogenic pump type storage tank. Background technique [0002] LNG (Liquefied Natural Gas), the English abbreviation for liquefied natural gas. Natural gas is a combustible gas that is naturally extracted from gas fields, and its main component is methane. LNG is condensed into a liquid by cooling gaseous natural gas at normal pressure to -162°C. Natural gas liquefaction can greatly save storage and transportation space, and has the characteristics of large calorific value and high performance. [0003] Liquid nitrogen (Liquid nitrogen) is often written as LN2, which is the liquid form of nitrogen gas at low temperature. The boiling point of nitrogen is -196°C. If the temperature is below this under normal atmospheric pressure, liquid nitrogen will be formed; if it is pressurized, liquid nitrogen can be obtained at a higher tem...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a skid-mounted gas filling device with a built-in cryogenic pump type storage tank in view of the above-mentioned problems, mainly to solve the problems that often occur in LNG gas filling stations due to insufficient liquid extraction and poor gas return. Reasons, which lead to the failure of normal liquid addition; suitable for LNG and LN2 (liquid nitrogen); the support structure of the cryopump can facilitate the installation and maintenance of the cryopump, even if there is liquid in the storage tank, there is no need to put the storage tank To discharge the liquid in the tank, you only need to discharge a small amount of gas in the storage tank to reduce the pressure of the storage tank, and then the cryopump can be installed or taken out, which makes the operation very convenient and quick; the suction port of the cryopump is close to the bottom of the tank, even if the liquid level of the storage tank is very low It will not affect the low situation, which greatly improves the utilization rate of the liquid in the storage tank

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