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Stack gas flow measurement based on fan characteristics; Bestaemning av roekgasfloeden genom flaektmaetning

Technical Report:

Abstract

The aim of the project was to evaluate the accuracy and the stability of the stack gas flow meters used to calculate stack gas emissions. Special attention was given to a new continuous flow measurement method, called the fan method. In this method stack gas flow is continuously calculated from the measured values for differential pressure over the stack gas fan and for its control quantity. The mathematical form of the calculation equation is derived from the fan physics. The values for the constant in the equation are determined from in situ calibration measurements. The project was carried out as case studies on three solid fuel boilers. The boilers were chosen so that their stack gas flow meters, a thermal mass flow meter, a permanently installed pitot tube, and an ultrasonic flow meter were representative of the types most commonly used in Sweden for stack gas flow measurement. The fan method was formulated into a generally applicable measurement method which can be applied to boilers with all kinds of stack gas systems. The observations on the fan method suggested that in order to keep the measurement uncertainty within {+-} 4% calibrations against a flow rate reference would be needed perhaps  More>>
Authors:
Yli-Juuti, E; Kuoppamaeki, R [1] 
  1. Indmeas Ky Industrial Measurements, Espoo (Finland)
Publication Date:
Dec 01, 1994
Product Type:
Technical Report
Report Number:
SVF-521
Reference Number:
SCA: 540120; PA: SWD-95:007029; EDB-95:031138; SN: 95001320516
Resource Relation:
Other Information: PBD: Dec 1994
Subject:
54 ENVIRONMENTAL SCIENCES; AIR POLLUTION MONITORING; CALCULATION METHODS; STACK DISPOSAL; FLOW RATE; FLUE GAS; GAS FLOW; BLOWERS; BOILERS; SOLID FUELS; 540120; CHEMICALS MONITORING AND TRANSPORT
OSTI ID:
10114462
Research Organizations:
Stiftelsen foer Vaermeteknisk Forskning, Stockholm (Sweden)
Country of Origin:
Sweden
Language:
Swedish
Other Identifying Numbers:
Journal ID: ISSN 0282-3772; Other: ON: DE95737674; TRN: SE9507029
Availability:
OSTI; NTIS
Submitting Site:
SWD
Size:
35 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Yli-Juuti, E, and Kuoppamaeki, R. Stack gas flow measurement based on fan characteristics; Bestaemning av roekgasfloeden genom flaektmaetning. Sweden: N. p., 1994. Web.
Yli-Juuti, E, & Kuoppamaeki, R. Stack gas flow measurement based on fan characteristics; Bestaemning av roekgasfloeden genom flaektmaetning. Sweden.
Yli-Juuti, E, and Kuoppamaeki, R. 1994. "Stack gas flow measurement based on fan characteristics; Bestaemning av roekgasfloeden genom flaektmaetning." Sweden.
@misc{etde_10114462,
title = {Stack gas flow measurement based on fan characteristics; Bestaemning av roekgasfloeden genom flaektmaetning}
author = {Yli-Juuti, E, and Kuoppamaeki, R}
abstractNote = {The aim of the project was to evaluate the accuracy and the stability of the stack gas flow meters used to calculate stack gas emissions. Special attention was given to a new continuous flow measurement method, called the fan method. In this method stack gas flow is continuously calculated from the measured values for differential pressure over the stack gas fan and for its control quantity. The mathematical form of the calculation equation is derived from the fan physics. The values for the constant in the equation are determined from in situ calibration measurements. The project was carried out as case studies on three solid fuel boilers. The boilers were chosen so that their stack gas flow meters, a thermal mass flow meter, a permanently installed pitot tube, and an ultrasonic flow meter were representative of the types most commonly used in Sweden for stack gas flow measurement. The fan method was formulated into a generally applicable measurement method which can be applied to boilers with all kinds of stack gas systems. The observations on the fan method suggested that in order to keep the measurement uncertainty within {+-} 4% calibrations against a flow rate reference would be needed perhaps only every second year. The results from the first calibrations of the stack gas flow meters showed that after installation and maintenance controls by the site personnel, significant errors often exist in the measurements. These errors must be eliminated by in situ calibration using a reliable flow rate reference. Long term instability was also observed. It was concluded that the flow meters should be calibrated at least twice a year in order to have some confidence that the measurement inaccuracy is below {+-} 4%. 12 figs}
place = {Sweden}
year = {1994}
month = {Dec}
}