Low grade heat recovery system for woodfuel cogeneration plant using water vapour regeneration

Dagilis, Vytautas; Vaitkus, Liutauras; Balčius, Algimantas; Gudzinskas, Juozas; Lukoševičius, Valdas

doi:10.2298/tsci171020081d

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…The integration of industrial waste heat in DHS is a different approach to decrease the consumption of fossil fuels and GHG emissions. Because a significant amount of low-grade waste heat from manufacturers (mainly in the temperature range between 30 and 120 • C [35]) is dissipated into the atmosphere during the production processes, huge quantities of potential energy are lost [22,36,37]. Thus, it is deeply advisable to recover, collect, and reuse such industrial waste heat in DH systems.…”

Section: Energy Sourcesmentioning

confidence: 99%

Smart Asset Management for District Heating Systems in the Baltic Sea Region

et al. 2021

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The purpose of this review is to provide insight and a comparison of the current status of district heating (DH) systems for selected Baltic Sea countries (Denmark, Germany, Finland, Latvia, Lithuania, Poland, and Sweden), especially from viewpoints of application and solutions of novel smart asset management (SAM) approaches. Furthermore, this paper considers European projects ongoing from 2016, involving participants from the Baltic Sea Region, concerning various aspects of DH systems. The review presents the energy sources with particular attention to renewable energy sources (RES), district heating generations, and the exploitation problems of DH systems. The essential point is a comparison of traditional maintenance systems versus SAM solutions for optimal design, operating conditions, and controlling of the DH networks. The main conclusions regarding DH systems in Baltic Sea countries are commitment towards a transition to 4th generation DH, raising the quality and efficiency of heat supply systems, and simultaneously minimizing the costs. The overall trends show that applied technologies aim to increase the share of renewable energy sources and reduce greenhouse gas emissions. Furthermore, examples presented in this review underline the importance of the implementation of a smart asset management concept to modern DH systems.

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Section: Energy Sourcesmentioning

confidence: 99%

Smart Asset Management for District Heating Systems in the Baltic Sea Region

et al. 2021

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“…In the literature, low-grade heat is not a clearly defined concept. In an article about a low-grade heat recovery system for wood fuel cogeneration, Dagilis et al [7] consider low grade heat to be around 50 • C, while in a comparison between different ORC ((Organic Rankine Cycle)) waste heat recovery systems, Ziviani et al [8] consider low-grade heat to be 80-100 • C. There are more sources with other temperature limits, hence low-grade heat is not a clearly defined concept. In this article, low grade heat is regarded as heat between 30 and 50 • C.…”

Section: Traditional District Heating Technologymentioning

confidence: 99%

Active Management of Heat Customers Towards Lower District Heating Return Water Temperature

Rosén

Ödlund

2019

Energies

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The traditional way of managing the supply and return water temperatures in a district heating system (DHS) is by controlling the supply water temperature. The return water temperature then becomes a passive result that reflects the overall energy efficiency of the DHS. A DHS with many poorly functioning district heating centrals will create a high return water temperature, and the energy efficiency of the DHS will be affected negatively in several ways (e.g., lower efficiency of the flue gas condenser, higher heat losses in pipes, and lower electricity production for a DHS with combined heat and power (CHP)). With a strategic introduction of low-grade heat customers, the return water temperature can be lowered and, to some extent, controlled. With the heat customers connected in parallel, which is the traditional setup, return water temperatures can only be lowered at the same rate as the heat customers are improved. The active management of some customers can lower the return water temperatures faster and, in the long run, lead to better controlled return water temperatures. Active management is defined here as an adjustment of a domestic heating system in order to improve DHS efficiency without affecting the heating service for the individual building. The opposite can be described as passive management, where heat customers are connected to the DHS in a standardized manner, without taking the overall DHS efficiency into consideration. The case study in this article shows possible efficiency gains for the examined DHS at around 7%. Looking at fuel use, there is a large reduction for oil, with 10–30% reduction depending on the case in question, while the reduction is shown to be largest for the case with the lowest return water temperature. The results also show that efficiency gains will increase electricity production by about 1–3%, and that greenhouse gas (GHG) emissions are reduced by 4–20%.

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“…Some economically reasonable actions that would reduce the emissions include changing fuels and retrofitting the plant's energy system in order to increase fuel use efficiency and lower CO 2 and NO x emissions [16,17]. It would be advantageous to plan for power production plants located in the vicinity where there are significant heat demands, in order to facilitate the development of district heating networks [18,19]. Among the solutions for the achievement of environmental sustainability in the energy sector, DH with CHP systems is increasingly being used.…”

Section: Introductionmentioning

confidence: 99%

Environmental Impact of District Heating System Retrofitting

2021

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Retrofitting of district heating systems is a comprehensive process which covers all stages of district heating (DH) systems: production, distribution and consumption. This study quantitatively shows the effect of retrofitting measures and represents strengths and weaknesses of different development scenarios. Improvements in production units show improvements in fuel use efficiency and thus indirectly reduce CO2 emissions due to unburned fuel. For this purpose, validated district planning tools have been used. Tool uses mathematical model for calculation and evaluation of all three main components of the DH system. For the quantitative evaluation, nine efficiency and balance indicators were used. For each indicator, recommended boundary values were proposed. In total, six simulation scenarios were simulated, and the last scenario have shown significant reduction in CO2 emissions by 40% (from 3376 to 2000 t CO2 compared to the actual state), while share of biomass has reached 47%.

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Low grade heat recovery system for woodfuel cogeneration plant using water vapour regeneration

Cited by 6 publications

References 20 publications

Smart Asset Management for District Heating Systems in the Baltic Sea Region

Smart Asset Management for District Heating Systems in the Baltic Sea Region

Active Management of Heat Customers Towards Lower District Heating Return Water Temperature

Environmental Impact of District Heating System Retrofitting

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