Air energy low-temperature liquefied gas pump-free filling system

Abstract

The invention discloses an air energy low-temperature liquefied gas pump-free filling system. The filling system mainly includes a gas dispenser (1), a transfer tank (2), a supercharger (3), a temperature increasing gasifier (4), a high pressure and low temperature storage tank (5), a vent pipe (6), an EAG gasifier (7), a low pressure and low temperature storage tank (8), a low saturation heat exchanger (9) and the like. A gas cylinder is filled with gas from a low temperature liquefied gas station, a pump is not needed, and the low pressure and low temperature storage tank (8) storing low temperature liquified gas is no needed to be pressurized; with the pressure provided by the high pressure and low temperature storage tank (5), the temperature difference between the low temperature liquefied gas and air can be used for absorbing air energy; low temperature liquified gas or high-pressure gas is additionally filled to the high-pressure gas cylinder, and the temperature and the pressure of a low temperature liquid stored in the low pressure and low temperature storage tank (8) are almost not increased due to gas filling. The energy consumption is reduced, the construction cost, useand maintenance cost of the gas filling station system device are also reduced, and the operation is safer and more reliable.

Description

technical field [0001] The present invention relates to the field of pump-less filling of low-temperature liquefied gas, in particular, relates to filling low-temperature gas cylinders with low-temperature gas cylinders without cryogenic pumps or gasifying low-temperature gas cylinders with high-pressure gas cylinders without pumps or pumps. The pipeline provides a system of normal temperature gas at a certain pressure. Such as liquid oxygen, liquid nitrogen, liquid argon, liquid hydrogen, liquid helium, liquefied natural gas (LNG) filling stations and filling stations, and gasification stations, especially LNG vehicle filling stations. Background technique [0002] Cryogenic liquefied gas is a gas that exists in liquid form, and it is to cool down and liquefy the gas for the needs of storage and transportation. It has a low temperature (generally between -162°C and -256°C under normal pressure), a large gas-liquid ratio (that is, the volume ratio of a unit volume of low-te...

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Problems solved by technology

[0005] 1. Energy consumption in the way of pumping: the power of cryopumps ranges from a dozen kilowatts to tens of kilowatts, and some sites even have to build dedicated substations for this purpose to meet the needs

Not only is the investment large, the area occupied is large, and there are many equipments, but the location of the construction site is also limited by the power supply, and the operation and maintenance costs are also increased;

[0006] 2. The operation and maintenance cost of the pump delivery method is high, the reliability is relatively low, and the service life is limited

[0007] 3. Large investment in pump transportation: due to various technical reasons, the stability of domestic cryopumps cannot meet the requirements, and they mainly rely on imports

[0010] In short, in the production of low-temperature liquefied gas, people spend a lot of energy and energy to cool down and liquefy the gas for storage and transportation, and in the production process, we invest expensive equipment and energy so that heat is directly input (such as pressurization) to heat it up, making it difficult to store and transport, is a very uneconomical thing

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