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High pressure pump system for supplying a cryogenic fluid from a storage tank

A low-temperature fluid and low-temperature system technology, applied in the direction of charging system, pump, pump control, etc., can solve the problem of high cost

Inactive Publication Date: 2005-01-12
WESTPORT POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Natural gas has been used to fuel piston engine-powered vehicles for more than 50 years, but the drive to improve efficiency and reduce pollution is causing continued changes and developments in existing technologies
Large cryogenic piston pumps with a capacity of about 40 gallons per minute (150 liters per minute) have been built, but such pumps are designed for very high delivery pressures, require positive delivery pressure and are expensive

Method used

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  • High pressure pump system for supplying a cryogenic fluid from a storage tank
  • High pressure pump system for supplying a cryogenic fluid from a storage tank
  • High pressure pump system for supplying a cryogenic fluid from a storage tank

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Embodiment Construction

[0072] Engines burning natural gas can be roughly divided into two categories, namely those with a low-pressure fuel system and those with a high-pressure fuel system. A low pressure fuel system is defined as an engine fuel system that operates at a fuel pressure lower than the minimum operating pressure of the storage tank. In this type of low pressure system, no fuel pump is required, and the storage tank has a vapor line to remove vapor from the storage tank and a liquid line to remove liquid from the storage tank. Each line is controlled by a corresponding valve which in turn is controlled by at least one pressure sensor. The engine normally receives fuel through the liquid line except when the tank pressure exceeds a certain pressure, say about 60 psig (516kPa), where the vapor line opens, releasing some vapors to the engine , which reduces the pressure in the storage tank, ensuring a longer holding time. This is a simple system that ensures that the tank pressure remai...

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Abstract

A medium and high pressure pump systems supplies a cryogenic fluid from a storage tank. The system comprises a pump that is operable to pump cryogenic liquid or a mixture of cryogenic liquid and vapor. The pump preferably comprises an inducer with at least two chambers and means for recycling excess fluid within the inducer instead of returning excess fluid to the storage tank. The reciprocating pump is preferably double acting such that fluid is discharged from the pump during both extension and retraction strokes.

Description

technical field [0001] The present invention relates to a medium and high pressure pump system for supplying cryogenic fluid from a storage tank and a method of operating the system to drain liquid and vapor from the storage tank thereby reducing venting requirements. A particular advantage of applying such a system and method lies in the supply of cryogenically stored fuel to an internal combustion engine. Background technique [0002] Natural gas has been used to fuel piston engine-powered vehicles for more than 50 years, but the drive to improve efficiency and reduce pollution is causing continued changes and developments in existing technologies. In the past, natural gas powered vehicles (NGVs) were naturally fumigated, meaning that natural gas was introduced into the cylinders through the intake manifold, mixed with incoming air and delivered to the cylinders at a lower pressure. The fuel supply system for such NGVs is relatively simple. Fuel is held at an operating p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M37/00F02M37/12F04B15/08F04B19/06F04B23/02F04B25/02F04B49/00
CPCF04B25/02Y10S417/901F04B19/06F04B15/08Y02T10/30
Inventor 安克·格拉姆斯蒂芬·诺布尔
Owner WESTPORT POWER
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