The Lohmander Energy, Forest, Fossil Fuels, CCS and Climate System Optimization Model
description
Transcript of The Lohmander Energy, Forest, Fossil Fuels, CCS and Climate System Optimization Model
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Derivation of the principles of optimal expansion of bioenergy based on forest resources in combination with fossil fuels, CCS and
combined heat and power production with consideration of economics and global warming
Lecture by Professor Dr. Peter Lohmander, Swedish University of Agricultural Sciences, SLU, Sweden,
http://www.Lohmander.com [email protected]
Operations Research for the Future Forest Management,
University of Guilan, Iran, March 8-12, 2014
Saturday March 8, 10.00-12.00
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Derivation of the principles of optimal expansion of bioenergy based on forest resources in combination with fossil fuels, CCS and combined heat and power production with consideration of economics and global warming
• In the production of district heating, electricity and many other energy outputs, we may use fossil fuels and renewable inputs, in
different combinations. The optimal input mix is a function of technological options, prices of different inputs and costs of alternative levels of environmental consequences. Even with presently existing technology in combined heat and power plants, it is usually possible to reduce the amount of fossil fuels such as coal and strongly increase the level of forest based energy inputs. In large parts of the world, such as Russian Federation, forest stocks are close to dynamic equilibria, in the sense that the net growth (and net carbon uptake) is close to zero. If these forests will be partly harvested, the net growth can increase and a larger part of the CO2 emitted from the CHP plants will be captured by the forests. Furthermore, with CCS, Carbon Capture and Storage, the rest of the emitted CO2 can be permanently stored. The lecture incudes the definition of a general optimization model that can handle these problems in a consistent way. The model is used to derive general principles of optimal decisions in this problem area via comparative statics analysis with general functions.
• The lecture also includes case studies from different parts of the world. In several countries, it is presently profitable to replace coal by forest inputs in CHP plants. In Norway and UK, CCS has been applied and a commercially attractive option during many years and the physical potential is large. Carbon taxes on fossil fuels explain this development. With increasing carbon taxes in all parts of the world, such developments could be expected everywhere. With increasing levels of forest inputs in combination with CCS, it is possible to reduce the CO2 in the atmosphere and the global warming problem can be managed. Furthermore, international trade in forest based energy can improve international relations, regional development and environmental conditions.
• Professor Dr. Peter Lohmander, Swedish University of Agricultural Sciences, SLU, Sweden, http://www.Lohmander.com [email protected]
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3The Lohmander Energy, Forest, Fossil Fuels, CCS and Climate System Optimization Model
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7The Lohmander Energy, Forest, Fossil Fuels, CCS and Climate System Optimization Model
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Fuel mix 1991 - 2006
Oil (BLACK)
Coal (DARK GREY)
Ruber (LIGHT GREY)
Forest chips(ORANGE)
Waste wood(PINK)
Waste (RED)
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12The Lohmander Energy, Forest, Fossil Fuels, CCS and Climate System Optimization Model
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s.t.
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The model does not include absolute constraintson the availability of fossil fuels.
Motive:Such constraints are assumed not to be binding in the optimal total solution.
Hydraulic fracturing also called fracturing and fracking has recently shown thatthere are very large quantitites of fossilfuels available in the world.
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Analysis:
s.t.
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Parameter assumptions:
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This constraint is not binding:
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Cost function assumptions:
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The classical dynamic natural resource model:
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Such forests do not change the carbon levels of the atmosphere.
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The Lagrange function, L,
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The Kuhn Tucker conditions are:
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Here, we have four of the constraints:
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Assumption: The optimal solution is an interior solution.
As a consequence, we know that:
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This means that the following equation system should be solved:
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The system with four equations and four endogenous variables is partly separable.
It may be split into one system with tree equations and three endogenous variables and a separate equation with only one endogenous variable, .
Stars denote optimal values.
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First, we investigate .
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We differentiate the first order optimum condition:
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The derivatives of with respect to the parameters are the following:
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s.t.
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Next, we investigate .The first order optimum conditions are found from this three dimensional equation system:
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We differentiate the equations:
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When we apply Cramer’s rule, we need to know .
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The derivatives of with respect to M are determined via Cramer’s rule:
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s.t.
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𝒅 𝑭∗
𝒅𝑴 =𝑪𝒉′ ′
𝑪𝒉′ ′ +𝑪𝑭
′ ′ >𝟎
𝒅𝒉∗
𝒅𝑴 =𝑪𝑭′ ′
𝑪𝒉′ ′+𝑪𝑭
′ ′ >𝟎
𝒅 𝝀∗
𝒅𝑴 =𝒌𝝅𝑪𝑭
′ ′ 𝑪𝒉′ ′
𝑪𝒉′ ′ +𝑪𝑭
′ ′ >𝟎
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The derivatives of with respect to are:
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s.t.
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𝒅 𝑭∗
𝒅𝒌𝑮=𝜶𝒉−(𝟏+𝜶𝑭 )𝒌𝝅 (𝑪𝒉
′ ′ +𝑪𝑭′ ′ )
<𝟎
𝒅𝒉∗
𝒅𝒌𝑮=
(𝟏+𝜶𝑭 )−𝜶𝒉
𝒌𝝅 (𝑪𝒉′ ′+𝑪𝑭
′ ′ )>𝟎
𝒅𝝀∗
𝒅𝒌𝑮=𝑪𝒉′ ′ (𝟏+𝜶𝑭 )+𝑪𝑭
′ ′ 𝜶𝒉
𝑪𝒉′ ′+𝑪 𝑭
′ ′ >𝟎
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The derivatives of with respect to :
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Observation:The sign of is expected to change over time, since fossil fuels in the long run become more scarce and more costly to extract. In most cases, it is assumed that in the year 2014. At some future point in time, and at later points in time .
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Observation:The sign of is expected to change over time, since fossil fuels in the long run become more scarce and more costly to extract. In most cases, it is assumed that in the year 2014. At some future point in time, and at later points in time .
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s.t.
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𝒅 𝑭∗
𝒅𝒌𝝅=
𝑪𝒉′ −𝑪 𝑭
′
𝒌𝝅 (𝑪𝒉′ ′ +𝑪𝑭
′ ′ ) {¿¿¿}𝟎𝒅𝒉∗
𝒅𝒌𝝅=
𝑪𝑭′ −𝑪𝒉
′
𝒌𝝅 (𝑪𝒉′ ′ +𝑪𝑭
′ ′ ) {¿¿¿}𝟎𝒅𝝀∗
𝒅𝒌𝝅=𝑪𝒉′ ′ 𝑪𝑭
′ +𝑪𝑭′ ′ 𝑪𝒉
′
𝑪𝒉′ ′+𝑪𝑭
′ ′ >𝟎
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The derivatives of with respect to are:
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s.t.
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𝒅𝑭 ∗
𝒅𝜶𝑭=
−𝒌𝑮
𝒌𝝅(𝑪𝒉′ ′+𝑪𝑭
′ ′ )<𝟎
𝒅𝒉∗
𝒅𝜶𝑭=
𝒌𝑮
𝒌𝝅(𝑪𝒉′ ′+𝑪𝑭
′ ′ )>𝟎
𝒅𝝀∗
𝒅𝜶𝑭=
𝑪𝒉′ ′𝒌𝑮
𝑪𝒉′ ′ +𝑪𝑭
′ ′ >𝟎
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The derivatives of with respect to are:
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s.t.
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𝒅 𝑭∗
𝒅𝜶𝒉=
𝒌𝑮
𝒌𝝅 (𝑪𝒉′ ′ +𝑪𝑭
′ ′ )>𝟎
𝒅𝒉∗
𝒅𝜶𝒉=
−𝒌𝑮
𝒌𝝅 (𝑪𝒉′ ′+𝑪 𝑭
′ ′ )<𝟎
𝒅 𝝀∗
𝒅𝜶𝒉=
𝑪𝑭′ ′ 𝒌𝑮
𝑪𝒉′ ′+𝑪𝑭
′ ′ >𝟎
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Referenceshttp://www.lohmander.com/Information/Ref.htm
Lohmander, P. (Chair) TRACK 1: Global Bioenergy, Economy and Policy, BIT’s 2nd World Congress on Bioenergy,Xi'an, China, April 25-28, 2012http://www.Lohmander.com/Schedule_China_2012.pdfhttp://www.Lohmander.com/PLWCBE12intro.ppt
Lohmander, P., Economic optimization of sustainable energy systems based on forest resources with consideration of the global warming problem: International perspectives,BIT’s 2nd World Congress on Bioenergy,Xi'an, China, April 25-28, 2012http://www.Lohmander.com/WorldCongress12_PL.pdfhttp://www.Lohmander.com/WorldCongress12_PL.dochttp://www.Lohmander.com/PLWCBE12.ppt
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Lohmander, P., Lectures at Shandong Agricultural University,April 29 - May 1, 2012, Jinan, China,http://www.Lohmander.com/PLJinan12.ppt
Lohmander, P. (Chair) TRACK: Finance, Strategic Planning,Industrialization and Commercialization, BIT’s 1st World Congress on Bioenergy, Dalian World Expo Center,Dalian, China, April 25-30, 2011http://www.bitlifesciences.com/wcbe2011/fullprogram_track5.asphttp://www.lohmander.com/PRChina11/Track_WorldCongress11_PL.pdfhttp://www.lohmander.com/ChinaPic11/Track5.ppt
Lohmander, P., Economic forest management with considerationof the forest and energy industries, BIT’s 1st World Congress on Bioenergy, Dalian World Expo Center, Dalian, China, April 25-30, 2011http://www.lohmander.com/PRChina11/WorldCongress11_PL.pdfhttp://www.lohmander.com/ChinaPic11/LohmanderTalk.ppt
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CONCLUSIONS:
With increasing levels of forest inputs in combination with CCS, it is possible to reduce the CO2 in the atmosphere and the global warming problem can be managed.
Furthermore, international trade in forest based energy can improve international relations, regional development and environmental conditions.
All suggestions concerning future cooperation projects are welcome!
Thank you!
Peter Lohmander
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APPENDIX
The classical dynamic natural resource model:
Observation:
Solution:
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