The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 06, 1985
Filed:
Jun. 08, 1982
Adi R Guzdar, Sudbury, MA (US);
Foster-Miller Associates, Inc., Waltham, MA (US);
Abstract
An improved sealing and liquid displacement system for a continuous linear pocket feeder for feeding materials from a low pressure to a high pressure region, particularly for feeding coal in a coal conversion process. A dual sealing system including a sphincter followed by a moving labyrinth seal is provided downstream of the hopper from which the coal is fed into moving pockets formed between spaced pistons in the driving chain, and upstream of the unloading station where the materials are deposited in a pressurized vessel. The sphincter is provided with means for adjusting the diameter of the tube surrounding the pistons to form a continuous contact seal. The desired labyrinth seal is formed by providing a close clearance between the pistons and the sealing tube. Downstream of the unloading station, a liquid displacement and gas seal system is provided which serves to displace gas residing within the moving pockets using a displacing liquid. Typically, two transfer tanks are provided, both of which are filled with the displacing liquid above the level of the pistons. One tank is a high pressure tank which has a return to the unloading station, while the second is a low pressure tank disposed downstream of the high pressure tank which completes the removal of gas from the pockets and returns the gas to a lower pressure point in the feeder system.