rīgas tehniskā universitāte enerģētikas un elektrotehnikas fakultāte vides aizsardzības un...
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Rīgas Tehniskā universitāteEnerģētikas un elektrotehnikas fakultāte
Vides aizsardzības un siltuma sistēmu institūtswww.videszinatne.lv
DEVELOPMENT OF DH SYSTEMS - COGENERATION VERSUS ENERGY
EFFICIENCY OF END USER
Dagnija Blumberga, Gatis Bazbauers, Andra Blumberga,
Ginta Cimdina, Claudio Rochas
Institute of Energy Systems and Environment,
Riga Technical University
Vides aizsardzības un siltuma sistēmu institūts
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Large CHP and DH system development features Cogeneration load decrease
Energy efficiency of buildings improvement Energy consumption of DH system decrease Load dispersion large
Technological development Dispersed energy generation Diversification energy generation and supply
as well as energy resources Innovative technologies
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Case study:To be or not to be. Riga DH system (part of Daugava river right bank)
Large energy sources 4 CHP CHP 1 – RTEC 1 – 144 MWe (natural gas) -
2005 CHP 2/0 – RTEC 2 – 200 MWe (natural gas) –
before 2000 CHP 2/1 – RTEC 2/1 – 400 MWe (natural gas) -
2010 CHP 2/2 - RTEC 2/2 – 400 MWe (natural gas) -
2013
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Historical data
2006 2007 2008 2009 20100
200
400
600
800
1000
1200
1400
1600
1800
Energ
y prod
uctio
n, GW
h/yea
r
electricity RTEC1
electricity RTEC2thermal energy RTEC1
thermal energy RTEC2
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Riga DH load duration curve. Existing situation
0
200
400
600
800
1000
1200
Th
erm
al
loa
d,
MW
th
hours0
41
3
82
6
12
39
16
52
20
65
24
78
28
91
33
04
37
17
41
30
45
43
49
56
53
69
57
82
61
95
66
08
70
21
74
34
78
47
82
60
Total thermal loadQ=2827 thous. MWhth/year
TEC2 thermal loadQ=1790 thous. MWhth/year
TEC1 thermal loadQ=1037 thous. MWhth/year
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Changes in thermal energy demand
Today energy efficiency measures have been introduced in 21 apartment buildings only, which constitute less than 1% of the total number of the apartment buildings in Riga.
The consumption of thermal energy in the existing buildings most likely will decrease by 20 – 30 % (in some cases by 50%).
The newly constructed apartments could increase thermal energy consumption, however the increase over the next 10-20 year period will not offset the reduction in consumption which will be gained through the introduction of energy efficiency measures.
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Initial data
Heat duration curve
Hypothesis for energy
consumption
Analysis of heat load of energy
sources
Heat duration curve
Technological calcuations &
solutions
Analysis of heat load of energy
sources
Scenario nScenario ….Scenario 1
justification
Economical Ecological
justification
Economical Ecological
justification
Economical Ecological
Comparison
Best solution
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Riga DH load duration curve. Forecast
0
200
400
600
800
1000
1200
Th
erm
al
loa
d,
MW
th
hours0
41
3
82
6
12
39
16
52
20
65
24
78
28
91
33
04
37
17
41
30
45
43
49
56
53
69
57
82
61
95
66
08
70
21
74
34
78
47
82
60
Total thermal loadQ=1764 thous. MWhth/year
Accululated heat energy Qaccum = 714 GWh
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Scenarious
Scenario 1. Continue to operate in regime when each plant operates for 3000 hours/year
Scenario 2. Heat load is covered by Riga TEC2/1 by using heat storage systems
Scenario 3. Natural gas is replaced by wood fuel in Riga TEC 1 and heat storage is installed
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Thermal energy production and accumulation
basic Scen. 1 Scen. 2 Scen. 3 0
500
1000
1500
2000
2500
3000
3500
total production accumulated energy summer production
Th
erm
al
en
erg
y,
GW
h/y
ea
r
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Economical data
Scenario 3. Natural gas is replaced by wood fuel in Riga TEC 1 and heat storage is installed
Scenarios1 2 3
Heat produced, GWhth/year 1764 1764 1764
Electricity produced, GWhe/year1757 1764 889
Natural gas consumption, GWhf/year 4131 4151 25
Wood fuel consumption, GWhf/year3093
Fuel costs, MLs/year 104 105 35Capital costs, MLs/year 76 55 52Operation and maintenance costs, MLs/year 17 7 9
Total costs, MLs/year 197 167 96Costs of electricity, Ls/MWhe 80 62 43
A
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Conclusions
Existing situation. The thermal energy consumption of the Riga right bank DH system is possible to cover demand with the existing, recently reconstructed cogeneration station at Riga TEC 1 and the first unit of TEC 2 (RTEC-2/1). However, the Riga TEC-2 first unit will operate only 3000 – 5000 hours per year.
Forecast of heat load. The thermal energy consumption will decrease by 20 – 30% because of the energy efficiency measures..
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Conclusions
No expanding of natural gas cogeneration regime. If the equipment of the new second unit of Riga TEC 2 is connected to the DH system of Riga and will operate in cogeneration mode for 3000 hours/year then it would require operation of the equipment of Riga TEC 1 or Riga TEC 2 first unit in the condensation mode.
Future for biomass cogeneration. An economic comparison of the three scenarios indicates that the lowest costs of electricity may be obtained if wood-fired cogeneration plant in combination with seasonal heat storage system is installed instead of the gas-fired gas turbine combined cycle cogeneration plants.