The Efficiency of the Cogeneration Unit Implemented in the CHS Systems in Terms of Heat Generation

Rimár, Miroslav; Fedak, Marcel; Abraham, Milan; Kulikov, Andrii; Váhovský, Jakub

doi:10.22306/atec.v3i2.24

Cited by 2 publications

(2 citation statements)

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“…Biomass is a very promising source of RE in the future, most sustainable [13], and can be used as a base load in a grid. In general, the use of biomass as a source of power generation has its problems [14], where the character of biomass, especially Moisture Content (MC) and Calorific Value (CV), affects the combustion conditions in the boiler [15,16]. High MC results in-efficiency of combustion, and it requires more effort from the operators to maintain the temperature and pressure in the boiler combustion chamber.…”

Section: Introductionmentioning

confidence: 99%

Utilizing the Heat Waste from Biomass Power Generation to Reduce the Moisture Content of Woodchips

Martoyoedo,

Nur,

Uyun

et al. 2024

BIO Web Conf.

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This paper is to study the drying method to reduce the moisture content (MC) of the woodchip. The methods used are to utilize the heat from solar and waste heat from the Biomass Power Plant (BioPP). By using a 250 °C heat waste from the BioPP, and stirring on the woodchip inside the drying equipment, the results obtained to reduce the MC from more than 40 % to MC around 20 % will take 2 h and 4 h faster than that which was not done on woodchips. Reducing MC from 40 % to 20 % will save 25.44 % on the woodchip consumption for combustion in the boiler of the BioPP. An analysis related to MC, CV, and woodchip consumption in generating electricity is also carried out. When MC is 26.70 %, the CV is 13.5 GJ T-1, and the woodchip consumption becomes 4.62 T h-1 and 1.31 T MWh-1, the energy produced is 764.7 kWh T-1. When the MC is higher, 47.68 %, causing the CV to become 9.8 GJ T-1, it is found that the consumption of the woodchips becomes 6.41 T h-1 and 1.81 T MWh-1, the energy produced is 551.3 kWh T-1.

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Section: Introductionmentioning

confidence: 99%

Utilizing the Heat Waste from Biomass Power Generation to Reduce the Moisture Content of Woodchips

Martoyoedo,

Nur,

Uyun

et al. 2024

BIO Web Conf.

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“…It is also crucial to assess seasonal system operation variations, both from a process as well as from an energy supply point of view. Cogeneration units, serving as energy suppliers for production processes, are operated in different regimes throughout the year [31], which results in a whole range of possible impacts of a process retrofit on the resulting energy and economic balance. Saving of low or middle pressure steam targeted by such measures is accompanied by cogenerated electric energy production decrease in the combined heat and power (CHP) unit [32]; thus, a "better" retrofit is to be compared with an already existing "efficient" energy production and consumption scheme.…”

Section: Introductionmentioning

confidence: 99%

Novel Concept of Cogeneration-Integrated Heat Pump-Assisted Fractionation of Alkylation Reactor Effluent for Increased Power Production and Overall CO2 Emissions Decrease

et al. 2020

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Alkylate produced by catalyzed reaction of isobutane and olefin-rich streams is a desired component for gasoline blending. Fractionation of the alkylation reactor effluent is energy demanding due to the presence of close boiling point components and solutions cutting its energy intensity; expenses associated with this process are investigated intensely nowadays. This paper presents a novel conceptual design and techno-economic analysis of alkylation reaction effluent fractionation revamp to reach a cut in energy costs of the fractionation process without the need to revamp the rectification columns themselves, providing thus an alternative approach to a more sustainable alkylation process. Two cases are considered—A. additional steam turbine installation or B. combustion engine-driven heat pump-assisted rectification. Mathematical modeling of the considered system and its revamp is applied using the “frozen technology” approach. Real system operation features and seasonal variations are included considering the refinery’s combined heat and power (CHP) unit operation and CO2 emissions balance both internal and external to the refinery. Case A yields an expectable yearly benefit (saved energy minus additionally consumed energy minus CO2 emissions increase; expressed in financial terms) of €110–140 thousand, net present value (NPV) of −€18 to €272 thousand and produces 3.3 GWh/year of electric energy. Case B delivers a benefit of €900–1200 thousand, NPV of −€293 to €2823 thousand while producing 33 GWh/year of electricity. Both cases exhibit analogous simple payback periods (8–10 years). Marginal electric efficiency of Case B (78.3%) documents the energy integration level in this case, exploiting the system and CHP unit operation synergies. CHP unit summer operation mode and steam network restrictions significantly affect the seasonal benefit of Case B. CO2 emissions increase in both cases, Case A and Case B, considering the refinery level. However, including external CO2 emissions leads to emissions decrease in both cases of up to 26 kton/year (Case B.) The presented results document the viability of the proposed concepts comparable to the traditional (reference) solution of a high performance (COP = 8) heat pump while their performance sensitivity stresses the need for complex techno-economic assessment.

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The Efficiency of the Cogeneration Unit Implemented in the CHS Systems in Terms of Heat Generation

Cited by 2 publications

References 0 publications

Utilizing the Heat Waste from Biomass Power Generation to Reduce the Moisture Content of Woodchips

Utilizing the Heat Waste from Biomass Power Generation to Reduce the Moisture Content of Woodchips

Novel Concept of Cogeneration-Integrated Heat Pump-Assisted Fractionation of Alkylation Reactor Effluent for Increased Power Production and Overall CO2 Emissions Decrease

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