Using alternative types of energy in the process of regeneration of the adsorbents

1.

DOBROTVORSKIY S. S.
DOBROVOLSKA L. G.
ALEKSENKO B. A.
USING ALTERNATIVE TYPES OF ENERGY
IN THE PROCESS OF REGENERATION OF THE ADSORBENTS
KHARKOV 2017

2.

Water is present in the atmosphere. It is pumped by compressors into the pneumatic
systems.
Litres / day
Related
humidity, %
Temperature, C
Intake of moisture at suction flow rate 250 m3/h and outlet pressure 8 bar.

3.

Water is present in the atmosphere. It is pumped by compressors into the pneumatic
systems.
Freezing pipes
and idle production
Rusting of pipes and
Equipment breakdowns
AIR COMPRESSOR
Inability
to provide technological processes

4.

Water is present in the atmosphere. It is pumped by compressors into the pneumatic
systems.
Long-term resource of equipment and
communications
Maintenance of modern
technological processes
Reducing
production costs
and increasing productivity
AIR COMPRESSOR
AIR DRYER
The use of separators, filters and dryers solves these problems

5.

6.

7.

A dryer is an typre of equipment, that
consumes compressed air.
WET AIR
Blowing
purge air losses
Water
removal losses
DRY AIR
Reducing the amount
of compressed air, used
to adsorbent
regeneration, is a
challenge that must be
addressed to reduce
the cost of air
production.
UP TO 20 % AIR LOST

8.

Dry air
Purge air, temperature 200 0С
Adsorbtion
column “B”
Adsorbtion
column “A”
Being dryed air
Adsorption columns of the dryer
and their cyclic functioning.
AIR DRYER

9.

The design of the adsorption dryer should ensure efficient heating of the adsorbent
and its subsequent cooling.
In the construction of the dryers uses:
- Complex systems of electric heaters
and blowers,
- Since the heated purge air has a
large amount of energy, heat
recuperators are used,
- If the drying process of the adsorbent
lasts longer than the adsorption
process, additional adsorption
columns must be used.
This complicates the design and increases the cost of the dryer.

10.

A comparative computer experiment was performed in which the humidity of the
adsorbent was reduced to level Hu using convection and microwave radiation successively .
0
t purge _ air = 180 C
0
t purge _ air = 20 C
Humidity level
change
E port1 = 0 Wt
H u1 ® H u 0
E port1 = 250 Wt
E port 2 = 0 Wt
Convection
regeneration
E port 2 = 250 Wt
Microwave
regeneration

11.

TARGET GUNCTION
DQ =
t ( Hu 0 )
ò
f (Qdesorption _ convection - Qdesorption _ microwave )dt ® max
t ( H u1 )
ìït = 180 0C üï
í
ý
ïî E = 0 Wt ïþ
Convection
regeneration conditions
OR
ìï t = 20 0C üï
í
ý
ïî E = 500 Wt ïþ
Microwave regeneration
conditions

12.

In the process of mathematical modeling of the regeneration process using the
convection desorption method, the following equations were used:
¶T
Q heat =ρCp
+ρCpu × ÑT - Ñ × (k ÑT )
¶t
Purge air, temperature
Q evap _ heat
psat (T )
= H vap × K × (
- c)
RT
Evaporation heat
Q desorption _ convection = cmDT
Heat of desorbtion
Q convection-Q evaporation = Q desorption
Heat balance equation
ìït = 180 0C üï
í
ý
ïî E = 0 Wt ïþ

13.

In the process of mathematical modeling of the regeneration process using the
microwave desorption method, the following equations were used:
¶T
Q heat = r c p
H vap + r c puÑT (k ÑT )
¶
t
Purge air, temperature
psat (T )
Q evap _ heat = H vap × K × (
- c)
RT
Evaporation heat
æ 1
ö
2
Ñ ´ ç Ñ ´ E(x, y) ÷ - k 0e gE(x, y) = 0
ç mg
÷
è
ø
The electromagnetic field distribution
2
Q microwave = E we r e0tg s
Microwave energy
ìï t = 20 0C üï
í
ý
ïî E = 500 Wt ïþ

14.

A comparative computer experiment was performed in which the humidity of the
adsorbent was reduced to level Hu using convection and microwave radiation successively .

15.

A comparative computer experiment was performed in which the humidity of the
adsorbent was reduced to level Hu using convection and microwave radiation successively .
ADSORBENT
The pole N of a magnet
The pole S of a magnet
MOLECULE
H2O
Non-magnetic material

16.

The action of microwave radiation makes it possible to effect on water molecules
directly.
MAGNETRON
æ 1
ö
Ñ ´ ç Ñ ´ E(x, y) ÷ - k 02e gE(x, y) = 0
ç mg
÷
è
ø
The electromagnetic field distribution
2
Q microwave = E we r e0tg s
Microwave energy
e H 2O >> e SIO2
The dielectric permittivity
The great value of the dielectric constant is explained by the peculiarities of the H2O molecule.
The large value of the static permittivity of water (ε = 81) is due to the fact that water is a
strongly polar liquid and therefore has a soft orientation degree of freedom (ie rotation
of molecular dipoles).
Q MV _ action _ H 2O >> Q MV _ action _ SIO2
The magnitude of the energy of microwave radiation

17.

WATER DEPORISATION STAGE
H u _ convection = H u _ microwave
Effects on
water molecules
ìït = 180 C üï
í
ý
ïî E = 0 Wt ïþ
0
ìï t = 20 C üï
í
ý
ïî E = 500 Wt ïþ
0
Microwave regeneration
Convection
regeneration conditions conditions
100 ° C
80 ° C
20 ° C
Convection
heating
Microwave
influence
DTconvection > DTmicrowave
DT 2
DT 1
o
DTconvection = 100
o
DTmicrowave = 60
Computer calculations showed, that when drying by convection, the temperature of the
adsorbent was 100 ° C. And when it was dried with microwaves - 80 ° C only.

18.

Qcooling _ air = cmair DT
mair (convection) > mair ( microwave)
COOLING ADSORBENT STAGE
Volume
of cooling
dried air
Required amount of cooling air
100 ° C
80 ° C
20 ° C
Convection
heating
Microwave
influence
Vair (convection) > Vair ( microwave)
DT 2
DT 1
Taking into account that
V = m / r and r = const
ensues, that
A lower heating temperature of the adsorbent requires a smaller volume
of dried air to cool the adsorbent to the adsorption temperature

19.

In the process of
convection heating,
data are obtained on
the dynamics of
temperature growth
in the control layers
Sa1, Sa2, Sa3, Sa4,
Sa5 and Sa6 of the
adsorbent volume.
Convection heating influence on the
temperature of the adsorbent volume

20.

Microwave influence on the temperature
od the adsorbent volume
In the process of
microwave heating,
data are obtained on
the dynamics of
temperature growth
in the control layers
Sa1, Sa2, Sa3, Sa4,
Sa5 and Sa6 of the
adsorbent volume.

21.

Unevenness of convection
Unevenness of electromagnetic field strength
Unevenness of heating
and the reasons for this

22.

Also, data are obtained on the dynamics of average temperature growth of the
adsorbent volume.
DT 1
DT 2
DT 1 > DT 2

23.

Only 15% of the energy expended by the compressor
passes into the potential energy of compressed air
85%
15%
12%
Compression heating
energy consumption
100% energy
15%
2%
air
lost
1%
wet air
12%
dry air
AIR COMPRESSOR
AIR DRYER
THE ENERGY SAVINGS OF THE COMPRESSOR WILL BE 6.6%.
In case
of an
additional
saving of
cooling air by
1.4 times, the
purge air costs
will decrease
from 3% to
2%.

24.

THANK YOU FOR YOUR TIME AND ATTENTION!