Double-acting reciprocating submerged liquid hydrogen pump

Abstract

The invention discloses a double-acting reciprocating submerged liquid hydrogen pump. The liquid hydrogen pump comprises the following components of an isolation part, a pump main body, a cold end part of the pump main body and a power part; the isolation part is connected with a liquid hydrogen container, the pump main body is mounted in the isolation part, and the power part is connected with the cold end part of the pump main body; the cold end part comprises a cold end cylinder body, a cold end piston divided into a cold end cylinder body upper cavity and a cold end cylinder body lower cavity is arranged in the cold end cylinder body, and an isolation valve of the isolation part is arranged on the lower side of the cold end cylinder body; the cold end cylinder body upper cavity communicates with the isolation valve of the isolation part through an upper cavity suction pipe and is also connected with a liquid hydrogen outlet pipe through an upper cavity discharge pipe; and the coldend cylinder body lower cavity communicates with the isolation valve through a lower cavity inlet one-way valve and is also connected with the liquid hydrogen outlet pipe through a lower cavity outletone-way valve. According to the double-acting reciprocating submerged liquid hydrogen pump, the pre-cooling step before working is omitted, and the function of conveying liquid hydrogen is achieved in any action of reciprocating up and down at the cold end, so that the working efficiency is greatly improved, the liquid hydrogen conveying amount is large, and the output flow pulsation characteristic is better.

Description

technical field [0001] The invention relates to the field of liquid hydrogen energy, in particular to a double-action reciprocating submersible liquid hydrogen pump. Background technique [0002] Liquid hydrogen (LH2) is a high-energy, ultra-low temperature liquid clean fuel. Compared with gas hydrogen and metal hydrides, liquid hydrogen has incomparable advantages in terms of energy storage density and transportation costs, and has a broad development space. China has also issued a number of related policies to support the hydrogen energy industry. The liquid hydrogen pump used for liquid hydrogen transportation is one of the important equipment in the liquid hydrogen industry. [0003] At present, the unloading and transportation of liquid hydrogen basically adopts the pressurized extrusion method. The container design requirements are high, the output pressure is low, and the high-temperature pressurized gas may cause the risk of thermoacoustic vibration. [0004] In ge...

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Problems solved by technology

It is characterized by the need for deep pre-cooling before starting the pump, the preparation work is tedious and time-consuming, and BOG (a low-temperature liquid that is liquefied after the gas is pressurized below the critical temperature, because it is difficult to be absolutely insulated from the environment, it absorbs external heat and evaporates. Gas) loss is large, it will pollute the air and increase the cost

In LNG storage and transportation, there are also electric centrifugal pumps that are completely submerged in liquid, but because the temperature of liquid hydrogen (-253°C) is much lower than that of LNG (-169°C), the problem of motor submersion cannot be solved, so it needs to be solved urgently

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