Pannon Power – Biomass Power Plant project combustion flow

measurement using a diff.pressure Pitot tube and a

unique calibration method

Manninger Gusztav

Flowell Kft.

Project , measuring methodintorduction

Measuring problem

Calibration method

TechnicalSolution

Possibilities

Results

35 MW-capacity – biomass100% green energy for the total central heating demand of city PÉCS

DFL100 flowmeters

Venturi meter

Venturi details:

• Old Power station building – new plant – fixed isometric • There can not be measured any flow !

– there are no straight pipe lines– But there are valves just ahead of the measuring points– And we have elbows…….which should avoid !

look at the isometric:

What’s the problem ?

Measuring principle

• Overvie

dt

L.V.2

L.V.1

Display

Error

1000 m /h3

1000 kg/h

mA

STO MOD

+

• Flow rate measurement with a probe by the principle of differential pressure method

• Evaluation with the Microprocessor Unit D-FL 100-10 (optional)

• Adjustable parameters

• Load-independent current for line recorder and indicator instrument

Overview

• stack diameter 0.3 to 8 m (Probe I: 0.3 to 2 m, Probe II: 2 to 4 m; Probe III: 4 to 8 m)

• minimum gas velocity 3 m/s• for gases above dew point• temperatures up to 400°C / stainless steel 1.4571• temperatures up to 700°C / Inconel 600• special materials for acid gases / Hastelloy C276 • accuracy guaranteed better than ±2% according to VDI 2066• transmitter mountable on the probe or separately• cross-over cock for zero-point control and backflow purging• long maintenance intervals > 3 month• dust loads up to 150 mg/nm3 without automatic purging systems• microprocessor evaluation unit for temperature and absolute pressure

compensation• very robust system• transmitters are factory calibrated• easy to install

DFL100 aplicable:

Density

rn standard density under standard conditions

Pn standard pressure = 1,013 x 105 Pa

P operating pressure in Pa

Tn standard temperature = 0°C

T operating temperature in °C

Volume Flow

Standard

Volume

Flow

Accuracy…

• Low flow, huge diameter, looking for the cheepest solution – as it used to be

• No ultrasonic possibilities just because the very low pressure• No more dp loss is allowed• Short delivery time

THE ONLY POSSIBILITY A DP MEASURING• NO CHANCE FOR VENTURI• AVERAGING PITOT TUBE - WITH AN UNIQUE CALIBRATION

MADE BY

Possibilities

• There is a VENTURI master meter in a common pipe line – d=1000 mm – D=2000 mm– L=11873 mm

• All the 6 pcs. of DURAG DFL100 probe can be easily blindid• Different flowrates – fast response• Small type of shut off valves – for blinding all the 6 DFL100• Measuring points with opening/closing pipe sections – calibrating to

the master meter, and to thouse probes which are installed perfectly 3 probes are percfectly installed

• 3 probes had no space for the right installation

Calibration method

Qvent A B C D E F dP Venture Nm³/h Vent Szelep nyitva

45% 46000 37000 20000 0 3700 23000 756 F 129700

45% 46000 37800 20000 0 21000 6000 751 E 130800

45% 45000 37000 20000 15000 13000 0 760 D 130000

45% 33000 1000 26000 17000 13000 20000 570 C 110000

45% 22000 49000 20000 13000 B 104000

A 0

0

70% 40000 72000 31000 20000 20000 24000 1850 145000 207000

55% 32000 57000 25000 16000 12000 19000 1100 113500 161000

45% 26000 47000 20000 13000 8000 16000 730 92300 130000

35% 21000 37000 16000 10000 4500 12000 450 71300 100500

30% 18000 32000 13500 8800 3500 9500 61000 85300

30% 24000 8000 0 12800 7000 15000 47600 66800

45% 36000 8000 0 19000 16000 23000 72000 102000

45% 55000 47000 24000 3000 0 0 85000 129000

35% 42500 36500 19000 2000 0 0 66000 100000

Some resoults at different flow rates……

Some resoults at different flow rates……0 0,0 62,4 0 0,0 63,51 3,3 61,7 1 3,3 63,12 6,7 60,6 2 6,7 62,43 10,0 59,0 3 10,0 61,34 13,3 57,0 4 13,3 59,75 16,7 54,5 5 16,7 57,86 20,0 51,5 6 20,0 55,57 23,3 48,2 7 23,3 52,78 26,7 44,3 8 26,7 49,69 30,0 40,0 9 30,0 46,0

10 33,3 35,2 10 33,3 42,011 36,7 30,0 11 36,7 37,712 40,0 24,4 12 40,0 32,913 43,3 18,2 13 43,3 27,714 46,7 11,7 14 46,7 22,215 50,0 4,6 15 50,0 16,2

0.0 10.0 20.0 30.0 40.0 50.0 60.00.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

Some more……at different operating points

Some resoults at different flow rates……

65% 70% 75% 80% 85% 90% 95%0

20000

40000

60000

80000

100000

120000

140000

160000

anubar

venturi

30% 40% 50% 60% 70% 80% 90% 100% 110%0

50000

100000

150000

200000

250000

anubarventuri

40000 60000 80000 100000 120000 140000 160000 1800001.02

1.04

1.06

1.08

1.1

1.12

1.14

1.16

1.18

1.2

f(x) = 1.04022970086215E-06 x + 1.00741729745733

Calibration curves

0.0 10.0 20.0 30.0 40.0 50.0 60.00.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

DFL100 Probe, before correction of „k”

Venturi

After correction

• www.flowell.hu

• www.jovoert.eu

Thank you !