Thermodynamic simulation of dryer section heat recovery in paper machines

Sivill, Leena; Ahtila, Pekka; Taimisto, Matti

doi:10.1016/j.applthermaleng.2004.09.002

Cited by 30 publications

(19 citation statements)

References 2 publications

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“…Furthermore, all these methods assume constant heat capacities for the streams. This assumption is not applicable to humid air under condensing conditions [3,4,31].…”

Section: Earlier Workmentioning

confidence: 99%

“…The heat available for the next temperature interval depends on which of the cases in Figure 3, a) or b), is chosen as the preceding match. Thirdly, if the air is assumed to be completely saturated after each condensing temperature match, the effect of this assumption on the results needs to be estimated as, according to Sivill et al [3], the air may reach saturation point only on the heat exchanger surface and may remain unsaturated elsewhere.…”

Section: Methodsmentioning

confidence: 99%

“…We use a thermodynamic simulation model presented earlier by Kilponen 1 [2] to calculate the performance of heat recovery in the case of several operational and structural improvement opportunities. These opportunities are determined prior to simulation using engineering knowledge and guidelines presented by Sivill et al [3]. We also review the existing process integration methodologies for the retrofitting of heat exchanger networks (HEN) and the grass-root design of dryer section heat recovery systems to explain why these existing methods can not be applied to retrofit cases with condensing air.…”

Section: Introductionmentioning

confidence: 99%

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Energy efficiency improvement of dryer section heat recovery systems in paper machines – A case study

Sivill

Ahtila

2009

Applied Thermal Engineering

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To cite this version:Leena Sivill, Pekka Ahtila. Energy efficiency improvement of dryer section heat recovery systems in paper machines -A case study. Applied Thermal Engineering, Elsevier, 2009, 29 (17-18) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPTEnergy efficiency improvement of dryer section heat recovery systems in paper machines -A case study AbstractModern paper machines are equipped with heat recovery systems that transfer heat from the humid exhaust air of the paper machine's dryer section to different process streams. As a result of process changes, the heat recovery systems may operate in conditions far from the original design point, creating a significant potential for energy efficiency improvement. In this paper we demonstrate this potential with a case study of three operating paper machines. Both operational and structural improvement opportunities are examined. Since the existing retrofit methodologies for heat exchanger networks can not be applied to cases with condensing air, we use thermodynamic simulation models presented earlier to assess the effects of possible changes on the existing heat recovery systems. In order to reduce the required processing time of the simulation models, only a limited number of pre-screened retrofit designs are considered. The pre-screening is carried out on the basis of guidelines presented earlier.The analysis in the case mill revealed savings of 110 GWh/a in process heat with profitable investments. According to the follow-up study, the investments carried out have resulted in 12 % lower fuel use and 24 % lower CO 2 emissions. The results imply that all operating paper machines should be similarly examined.

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“…Furthermore, all these methods assume constant heat capacities for the streams. This assumption is not applicable to humid air under condensing conditions [3,4,31].…”

Section: Earlier Workmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy efficiency improvement of dryer section heat recovery systems in paper machines – A case study

Sivill

Ahtila

2009

Applied Thermal Engineering

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“…This can cause inaccuracies in the results with regard to paper machine heat recovery as the heat exchange is strongly non-linear in reality [15].…”

Section: The Restrictions and Assumptions Of The Analysismentioning

confidence: 99%

Analysis of a mechanical pulp and paper mill using advanced composite curves

Ruohonen¹,

Ahtila²

2010

Applied Thermal Engineering

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To cite this version:Pekka Ruohonen, Pekka Ahtila.Analysis of a mechanical pulp and paper mill using advanced composite curves.Applied Thermal Engineering, Elsevier, 2009, 30 (6- This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPT Analysis of a mechanical pulp and paper mill using advanced composite curvesPekka Ruohonen *), Pekka Ahtila ACCEPTED MANUSCRIPT AbstractIn this study a mechanical pulp and paper mill is analysed using advanced composite curves. It is a graphical pinch-based approach that takes into account the existing heat exchanger network and the utilities actually used at the mill. The possibilities of making a cost-effective heat exchanger retrofit in an operating mechanical pulp and paper mill are discussed. The study also shows that the advanced composite curves can be used to describe the amount of nonisothermal mixing taking place in the process.

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“…A paper machine's heat recovery system is vital to the overall energy economy of the papermaking process (Sivill, Ahtila, & Taimisto, 2005). A large amount of the thermal energy used in the drying process ends up in the exhaust air.…”

Section: Implement Heat Recovery In Pm3 (Ee-6)mentioning

confidence: 99%

Potential for reducing paper mill energy use and carbon dioxide emissions through plant-wide energy audits: A case study in China

et al. 2013

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The pulp and paper industry is one of the most energy-intensive industries worldwide. An energy audit is a primary step toward improving energy efficiency at the facility level. This paper describes a plant-wide energy audit aimed at identifying energy conservation and carbon dioxide (CO 2 ) mitigation opportunities at a paper mill in Guangdong province, China. We describe the energy audit methods, relevant Chinese standards, methods of calculating energy and carbon indicators, baseline energy consumption and CO 2 emissions of the audited paper mill, and nine energy-efficiency improvement opportunities identified by the audit. For each of the nine options, we evaluate the energy conservation and associated CO 2 mitigation potential. The total technical energy conservation potential for these nine opportunities is 967.8 terajoules (TJ), and the total CO 2 mitigation potential is equal to 93,453 tonnes CO 2 annually, representing 14.4 percent and 14.7 percent, respectively, of the mill's total energy consumption and CO 2 emissions during the audit period.

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Thermodynamic simulation of dryer section heat recovery in paper machines

Cited by 30 publications

References 2 publications

Energy efficiency improvement of dryer section heat recovery systems in paper machines – A case study

Energy efficiency improvement of dryer section heat recovery systems in paper machines – A case study

Analysis of a mechanical pulp and paper mill using advanced composite curves

Potential for reducing paper mill energy use and carbon dioxide emissions through plant-wide energy audits: A case study in China

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