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1. (WO2018145706) EARLY DETECTION OF SMOLDERING POWDERS IN POWDER DRYING SYSTEMS COMPRISING A CO GAS DETECTION SYSTEM

Pub. No.:    WO/2018/145706    International Application No.:    PCT/DK2017/050033
Publication Date: Fri Aug 17 01:59:59 CEST 2018 International Filing Date: Fri Feb 10 00:59:59 CET 2017
IPC: G01N 21/3504
G01N 33/00
G01N 21/85
F26B 3/12
F26B 25/00
G08B 21/16
Applicants: GEA PROCESS ENGINEERING A/S
Inventors: JENSEN, Poul Erik Krogsgaard
JACOBSEN, Gerhardt
SEHESTED, Anders
Title: EARLY DETECTION OF SMOLDERING POWDERS IN POWDER DRYING SYSTEMS COMPRISING A CO GAS DETECTION SYSTEM
Abstract:
The invention concerns a powder drying system (1 ) comprising a carbon monoxide (CO) gas detection system adapted for detection of CO gas from smoldering powders in a powder drying system component, such as a spray dryer chamber (200), a fluid bed (500) or a bag filter (400), which CO gas detection system comprises at least one inlet CO gas detector (3) arranged on at least one gas inlet of a powder drying system component such as to provide at least one inlet CO gas content measurement, at least one outlet CO gas detector (3) arranged on at least one gas outlet of a powder drying system component such as to provide at least one outlet CO gas content measurement, and an analyzing unit (5) adapted for receiving the at least one inlet CO gas content measurement, receiving the at least one outlet CO gas content measurement and comparing the sum of the at least one inlet CO gas content measurement and the sum of the at least one outlet CO gas content measurement while compensating for dilution, mixing, and time delay of the outlet CO gas content measurement. At least the at least one outlet CO gas detector (3) comprises an IR laser transmitter and is adapted for detecting over a measurement volume (6) and is arranged on the at least one gas outlet in such a way that said measurement volume (6) extends directly inside a gas flow (20) in said at least one gas outlet.