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Hydrogen Tank Fill Hose Automatic Purge System

IP.com Disclosure Number: IPCOM000200096D
Publication Date: 2010-Sep-27
Document File: 2 page(s) / 53K

Publishing Venue

The IP.com Prior Art Database

Abstract

A system for purging a dedicated fill hose attached to a liquid hydrogen tank. During routine operating mode a small flow of hydrogen from the cryogenic tank purges the fill hose and is vented. During tank fill mode purge flow to the fill hose is stopped. This way unsafe venting of hydrogen is prevented.

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Hydrogen Tank Fill Hose Automatic Purge System

ABSTRACT

A system for purging a dedicated fill hose attached to a liquid hydrogen tank. During routine operating mode a small flow of hydrogen from the cryogenic tank purges the fill hose and is vented. During tank fill mode purge flow to the fill hose is stopped. This way unsafe venting of hydrogen is prevented.

DESCRIPTION

Cryogenic hydrogen tanks at some customer sites have a dedicated truck fill hose attached to it which is continuously purged. As shown in Figure 1, liquid hydrogen from cryogenic tank (6) is vaporized in a vaporizer and regulator assembly (7) for customers use. A small side stream of hydrogen gas is taken off through a valve (3), filtered and flow controlled by use of an orifice (8), which is sized to limit maximum flow to approximately 35 scfh in the event of a break in the tubing or component failure downstream. This side stream of hydrogen then flows through an automatic valve (21) positioned on a mounting post. The automatic valve (21) is either open or closed depending on the position of the hose bayonet (26) in the female bayonet adapter (15). When the bayonet (26) is inserted and clamped in place in the female bayonet adapter (15), the automatic valve (21) opens and purge hydrogen is allowed to flow. When the bayonet (26) is removed from the female bayonet adapter (15) the automatic valve (21) closes and stops the hydrogen flow. An orifice (9) installed downstream of the automatic valve (21) controls the flow of hydrogen to be sufficient for purging the fill hose
(27) (~5 scfh). A lockable ball valve and gage assembly (10) is located downstream of the orifice (9), for use by a qualified technician to test purge system during maintenance. The hydrogen continues flowing and enters the cryogenic fill hose (27) through check valves (1) and (2). The hydrogen purges the fill hose (27) in a counter current flow to the normal flow of the liquid hydrogen during a tank fill. The purge hydrogen then enters the bayonet (26) and the female bayonet adapter (15) and exits through che...