05 Agrobiotechnologies in Latvia

7/31/2019 05 Agrobiotechnologies in Latvia

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A robiotechnolo ies and lant

biomass production for energetic

Aleksandrs Adamovics, Vilis Dubrovskis, Imants Plume

Latvia University of Agriculture,Liela iela 2, Jelgava, LV-3001, Latvia

This presentation has been prepared within the framework of the ESF Project Attraction of human resources to the

research of the renewable energy sources, Contract Nr.

2009/0225/1DP/1.1.1.2.0/09/APIA/VIAA/129.


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(2006-2009)

500

600

d.ha

200

300

rea,

th

0100

Sown

a


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Agricultural areas in Latvia (2006)

Agricultural lands in Latvia (2006)

512

441500

600

Ha

346

250

200

300

400

a,

thou

s.

13 13 345

13 2 3 5

0

100

als pe es eet oot ato ble rop age ure rop ss) nd)

Ar

Cer

legu

Suga

r-

Fodd

er-

Po

Vege

t

Othe

r

Gree

nfo

Gree

nm

a

Necta

r-

allow

(mow

edgr

d(fo

rmer

agr

ic.l

Unu

s


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Cereal production, sale to processing and

procuremen en erpr ses anaverage purchase prices in Latvia


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Su ort for rowin of enercrops and production of biofuels

Direct State aid for biofuels produced Direct aid for energy crops, LVL

5,91

5

6

VL

2,88

,

3

4

nlats,

0,56

1,09

0,601

2

Milli

, ,0

2005 2006 2007 2008


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on moisture

Wet plant biomass (W 65%-85%)

ripening)

silage;

Preferred utilization in ener etic:Production of biogas


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moisture

Relatively dry biomass (W 8-45%)(straw, reed, hay, grain mill byproducts)

Production: biomass pellets;

briquettes

bales.

Production of heat and


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Cereals, rape straw and grass

outcome in 2002-2005

Cereals andrape

Area, thous.ha (aver.

2002-06)

Grain yield(aver.

2002-06),

Grain:straw

ratio

Straw,grass,

thous. tons

Straw,grass,

available for

Wheat 215 3,1 ~ 1:0,9 600

Barle 136 2 1 ~ 1:1 285

Rye 43 2,3 ~ 1:1,2 118

, ~ ,

Rape 51 1,7 ~ 1:1,3 114

Sum, straw 545 1216 174

Fallow grass 346 1,9 ~ 50% of 649 325grass area


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,and lime in Latvia

14

16 Lime, t ha-1

-1

10

12

, .

Organic fertilizers

6

8

2

4

0

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008


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Average yields of cereals and rape seed in Latvia,cnt/ha (2001-2008)

35

Cereals

30

Rape seed

,

25

y = 0,856x - 1697

15

102000 2001 2002 2003 2004 2005 2006 2007 2008 2009


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biomass residues in Latvia

Cereals and rape straw available for energy Se

calculates:

Se = Yg- Sm x As L - I == 1216 - 545 x 1,6 160 10 = 174 [thsd.t]

where,Se straw available for energy, thous. t;Yg straw yield, thsd. t;A - area of cereals and rape, ha;

Smstraw not removed from field to keep organic mattercon en a e same eve a a v a con ons, ous. ,(Sm=1.6 t/ha);

L straw for litter, t, ,


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Boiler for burnin of straw in

Saulaine, Latvia


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Plant for heat energy production

from straw in Saulaine, Latvia

Power of plant for burning of 1,36 MW

Utilised biomass - wheat straw, 1300 tons/year Area for straw production 500 ha

Average transport distance 6 km

ens y o square a es , ... , m

Weight of bale 500 kg

,

Heat energy produced 20 TJ/year


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ro ems, s raw urn ng process s usefor energy production

Straw contains chlorines (Cl 0,17...0,6%),that can cause forming of dioxines (attem eratures 600...700C .

Straw contain nitrogen (N 0,5....1,2%), that

temperatures above 750C.

, ... , ,that can cause melting of ashes (at

temperatures below 800C).


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ro ems, s raw urn ng process s usefor energy production

Straw burning process require morerunning costs, due to need for morefrequent cleaning of burners

Ashes, that is produced by straw burning,can contain heavy metals, for example,

use ashes as fertilizer in soil. There no ready available technologies for

soil, due to specific physical properties ofstraw asches.


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ecomen a ons, s raw urn ng process sused for energy production

Burning process should be provided withintemperatures 700-750 C.

Biomass retention time should be minimiozed attemperatures 600-700C, to avoid forming ofexcess dioxines, therefore small biomassparticles, e.g. pellets, is preferred to supply in

.

The combined usage of straw with otherbiomass, e.g. Wood, is preferable, due to

Most environmental technology is usage of

straw, after rtreatmen, for bio asproduction together with nitrogen-richbiomass.


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Recomendations regarding green biomassusage for energetic

Grasses from abandoned lands should be used

widely for energy production.

Energy crops with less need for mineralfertilizers should be preferred for bioenergy

pro uct on. Cropping systems having less number of tillage

operations should be preferred for energyproduction


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05 Agrobiotechnologies in Latvia