31003539 m2 gasfundbasics kw

8/19/2019 31003539 M2 GasFundBasics KW

1/20

1CTEC Training Offer

Days 1+2 - Learning Objectives At the end of the 2 days the trainee shall be able to :

determine for gas mixtures,

using the appropriate gas laws gas density

mixture molecular weight

conert from mass fraction to olume fraction

and ice ersa

read a psychrometric chart

perform manual process measurements

related to gases !T, p, ", , gas composition#


2/20


Day 1 : Gas Fundamentals and Basics Morning ession Exercises

$deal gas

%as density &ass fraction

'i(e of a dust collector

)ater apor


3/20

*CTEC Training Offer

!"e #$deal Gas La%&

p + n - T p + . T constant

po 1/1*,20 mbar

To 23*,10 45

- 6,*1771 8.!mole95#

ereinafter ;m< refers to po and To


4/20


'(ercise - $deal Gas La%)uestion The flow rate of gas in a =iln stac= is 123 *// mC and a relatie negatie

pressure of 0/ mbar9

Calculate that flow rate at normal conditions9


5/20

?CTEC Training Offer

$n*luence o* t"e ltitude$f absolute pressure aailable O5

$f not O5 call the weather serice for the absolute pressure

related to sea leel or use a barometer in plant

to correct with altitude

5,255

t273,15

h0,00651o p p

+×

−=


6/20


'(ercise - Gas Density - )uestion Calculate the density of air at 1//>C and a relatie

negatie pressure of 23 mbar9


7/20@CTEC Training Offer

Gas Density)arning

"or minor components use alues from standard tables, because

they are not ideal gas9

This mainly concerns 'O2:

'O2 & ?7,/? g.mole

ρo 2,606 =g.;m<

$n tables ρo 2,@2 =g.;m<

B se standard tables for enironmental calculations


8/201/CTEC Training Offer

'(ercise - Mass Fraction - )uestion

The following gas composition, on olume basis, was

measured at the bac= of a =iln9 Calculate it on mass

basis9 O2 : 2,@@D Ar : /,37DCO2 : */,11D 'O2 : 1?// ppm

;2 : ?2,16D 2O : *,62D

lease remember

Dolume Dmole !1 =mole 22,717 ;m


9/2012CTEC Training Offer


10/201*CTEC Training Offer

'(ercise - i,e o* a Dust ollector -

)uestionThe ent air system of a clin=er cooler is designed to handle

2// /// mC and relatie negatie pressure 2/ mbar

!system A#9

)hat would be the si(e of a dust collector, in term of filtering area,for that ent system, assuming a 0D !by mass# air inlea=age

with a airFtoFcloth ratio of 1,2 mC

and inlet pressure of 3 mbar9

Cooler Hag "ilter

J0D 22/ 4CK F3 mbar 2///// m



Day 1 : Gas Fundamentals and Basics Morning ession Exercises

)ater apor

+apor pressure M umidity New point temperature

)etFHulb M NryFHulb temperatures

sychrometric chart

Exercise 2 : Calculation of the dew point

temperature after the water spray



.a/or 0ressure and umidity 13 +apor ressure

%as

iPuid

pgas +apor ressure f!T#


13/201?CTEC Training Offer

.a/or 0ressure 4 umidity 23 artial pressure in a gas mixture

$n a gas mixture

Total gas pressure 'um of partial gas pressure artial gas pressure for gas i

pi xi 9 pgas

where

xi D !olumemole# of gas i in gas mixture

pgas total gas pressure



.a/or 0ressure 4 umidity 53 Condensation

%as !T, p# Condensation, whenpi B p !T#



.a/or 0ressure 4 umidity 63 -elatie humidity: -atio of the mole fraction of water apor to mole fraction of

apor in a saturated water.gas mixture at this temperature and

pressure

-atio of partial pressure of water in mixture to the saturationapor pressure

umidity ratio !absolute humidity#: -atio of the mass of water apor to the mass of dry gas

gasdrykg

O2

Hkg2

gasdry

O H

m

m=ω

( ) pT p

p

n

n

v

O H

saturated O H

O H

,2

2

2 ==φ


16/201@CTEC Training Offer

De% 0oint !em/erature The temperature at which apor condenses if a gas is

cooled at constant pressure

The saturation temperature corresponding to the actual

apor pressure


17/202/CTEC Training Offer

7et-Bulb 4 Dry-Bulb !em/eratures To measure humidity in air

NryFbulb thermometer: air temperature

)etFbulb thermometer: bulb coered with cotton wic=

saturated with water Air flowing on the bulb eaporates water

Temperature drops from heat transfer from bulb to water

Eaporation depends on air moisture content



?7>C dry bulb

70>C wet bulb

/9/03 =g water.=g dry air

2@93D relatie humidity⇒

0syc"rometric "art

2/>C )H

*/>C )H

7/>C )H

70>C )H

0/>C )H

00>C )H1//D relatie

humidity

0/D

20D

1/D0D relatie

humidity

/9//

/9/1

/9/2

/9/*

/9/7

/9/0/9/?

/9/3

/9/6

/9/@

/91/

2/ */ 7/ 0/ ?/ 3/ 6/ @/ 1// 11/ 12/

Dry bulb !em/erature 83

M o i s t u r e c o n t e n t 2 9 g : 9 g d r y a i r 3



NryFbulb temperature !>C# 6/ 12/

)etFbulb temperature !>C# 70 70

umidity !=g.=g dry air#

New point temperature !>C#

'(ercise 1 - 0syc"rometric "art)uestion New point temperature: temperature where humidity in

a gas starts to condense9

)etFbulb temperature: temperature resulting fromeaporatie cooling of the bulb


20/20

'(ercise 2 - alculation o* t"e De% 0oint !The rocess Engineer was able to determine the

gas conditions at the bac= of a long dry =iln:

13 Flo%rate: ;

31003539 m2 gasfundbasics kw

Documents