COMPLEX HEAT-RECOVERY SYSTEMS FOR BOILERS OF SMALL AND MEDIUM POWER WITH INCREASED MOISTURE CONTENT OF FLUE GASES

2018 ◽  
Author(s):  
Nataliia Fialko ◽  
◽  
Raisa Navrodska ◽  
Maksym Novakivskii ◽  
Georgii Gnedash ◽  
...  
Keyword(s):  
Water Treatment ◽  
Moisture Content ◽  
Complex Systems ◽  
Thermal Efficiency ◽  
Heat Recovery ◽  
Waste Heat ◽  
Flue Gases ◽  
Boiler Water ◽  
Heating Boiler ◽  
Chemical Water

The results of studies of thermal and humidity regimes and thermal efficiency of complex systems for recovering waste heat from boiler plants with an increased moisture content of exhaust-gases are presented. Systems designed for heating boiler water, water of a chemical water treatment system and combustion air are considered. It is shown that, according to the heat engineering indications, systems with heating boiler water and combustion air have advantages over systems for heating input boiler water and water for chemical water treatment.

ENERGY EFFICIENT PIPE HEAT EXCHANGER FOR WASTE HEAT RECOVERY FROM EXHAUST FLUE GASES

2017 ◽  
Vol 16 (5) ◽  
pp. 1107-1113 ◽  
Author(s):  
Andrei Burlacu ◽  
Constantin Doru Lazarescu ◽  
Adrian Alexandru Serbanoiu ◽  
Marinela Barbuta ◽  
Vasilica Ciocan ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Energy Efficient ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Flue Gases ◽  
Pipe Heat

scholarly journals The impact of the condensation process on the degree of cleaning of flue gases from acidic compounds

2018 ◽  
Vol 46 ◽  
pp. 00031
Author(s):  
Piotr Szulc ◽  
Tomasz Tietze ◽  
Daniel Smykowski
Keyword(s):  
Power Plant ◽  
Water Vapour ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Pilot Scale ◽  
Flue Gases ◽  
Condensation Process ◽  
Acidic Compounds ◽  
The Impact

The paper presents studies on the impact of the process of condensation of water vapour on the process of cleaning of flue gases from acidic compounds. The measurements were carried out on a pilot-scale plant for waste heat recovery from flue gases, taking into account the process of condensation of the water vapour contained in them. The plant was connected to a lignite-fired power unit with a capacity of 360 MW located at PGE GiEK S.A., Bełchatów Power Plant Branch. The impact of the condensation of water vapour on the reduction of sulphur, chlorine and fluorine forming acidic compounds was examined. The studies show that the condensation process is conducive to removal of acidic compounds from flue gases.

scholarly journals Enabling thermal efficiency improvement and waste heat recovery using liquid air harnessed from offshore renewable energy sources

2020 ◽  
Vol 275 ◽  
pp. 115351 ◽  
Author(s):  
Julian D. Osorio ◽  
Mayank Panwar ◽  
Alejandro Rivera-Alvarez ◽  
Chrys Chryssostomidis ◽  
Rob Hovsapian ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Thermal Efficiency ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Efficiency Improvement

Efficiency Enhancement of Novel Photovoltaic-Thermal (PVT) Air Collector

2014 ◽  
Vol 494-495 ◽  
pp. 1845-1848 ◽  
Author(s):  
Huan Liang Tsai ◽  
Chieh Yen Hsu ◽  
Yung Chou Chen
Keyword(s):  
Solar Cells ◽  
Thermal Efficiency ◽  
Heat Sink ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Conduction Mechanism ◽  
Waste Heat ◽  
Operating Temperature ◽  
The Novel ◽  
Efficiency Enhancement

This paper presents the efficiency enhancement for a novel photovoltaic/thermal (PVT) air collector in which PV and thermal efficiency is simultaneously enhanced with a reciprocal aid. With the encapsulation of solar cells directly on a fin-type heat sink, the direct conduction mechanism and the convective area for the thermal transportation are effectively increased. Through a two-month experiment measurement, it is found that the thermal efficiency of PVT module is obviously enhanced up to over 50% in sunny days. In addition, the waste heat recovery decreases the operating temperature of solar cells and concurrently improves the PV efficiency. The results demonstrate the concurrent enhancement of the novel PVT module in PV electricity and solar thermal efficiency.

scholarly journals Thermodynamic Analysis of Supercritical Carbon Dioxide Cycle for Internal Combustion Engine Waste Heat Recovery

Processes ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 216 ◽  
Author(s):  
Wan Yu ◽  
Qichao Gong ◽  
Dan Gao ◽  
Gang Wang ◽  
Huashan Su ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Thermal Efficiency ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Combustion Engine ◽  
Recovery Ratio ◽  
Split Flow ◽  
Exhaust Heat ◽  
Exhaust Heat Recovery

Waste heat recovery of the internal combustion engine (ICE) has attracted much attention, and the supercritical carbon dioxide (S-CO2) cycle was considered as a promising technology. In this paper, a comparison of four S-CO2 cycles for waste heat recovery from the ICE was presented. Improving the exhaust heat recovery ratio and cycle thermal efficiency were significant to the net output power. A discussion about four different cycles with different design parameters was conducted, along with a thermodynamic performance. The results showed that choosing an appropriate inlet pressure of the compressor could achieve the maximum exhaust heat recovery ratio, and the pressure increased with the rising of the turbine inlet pressure and compressor inlet temperature. The maximum exhaust heat recovery ratio for recuperation and pre-compression of the S-CO2 cycle were achieved at 7.65 Mpa and 5.8 MPa, respectively. For the split-flow recompression cycle, thermal efficiency first increased with the increasing of the split ratio (SR), then decreased with a further increase of the SR, but the exhaust heat recovery ratio showed a sustained downward trend with the increase of the SR. For the split-flow expansion cycle, the optimal SR was 0.43 when the thermal efficiency and exhaust heat recovery ratio achieved the maximum. The highest recovery ratio was 24.75% for the split-flow expansion cycle when the total output power, which is the sum of the ICE power output and turbine mechanical power output, increased 15.3%. The thermal performance of the split-flow expansion cycle was the best compared to the other three cycles.

Waste heat recovery and denitrification of flue gases from gas-fired boilers

2016 ◽  
Vol 59 (12) ◽  
pp. 1874-1881 ◽  
Author(s):  
Yan Zhao ◽  
XiaoLei Zhu ◽  
JiAn Meng ◽  
ZhiXin Li
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Flue Gases

scholarly journals Technologies for Waste Heat Recovery in Off-Shore Applications

2013 ◽  
Author(s):  
Leonardo Pierobon ◽  
Fredrik Haglind ◽  
Rambabu Kandepu ◽  
Alessandro Fermi ◽  
Nicola Rossetti
Keyword(s):  
Thermal Efficiency ◽  
Heat Recovery ◽  
Net Present Value ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Combined Cycle ◽  
Present Value ◽  
Payback Time ◽  
Low Weight

In off-shore oil and gas platforms the selection of the gas turbine to support the electrical and mechanical demand on site is often a compromise between reliability, efficiency, compactness, low weight and fuel flexibility. Therefore, recovering the waste heat in off-shore platforms presents both technological and economic challenges that need to be overcome. However, onshore established technologies such as the steam Rankine cycle, the air bottoming cycle and the organic Rankine cycle can be tailored to recover the exhaust heat off-shore. In the present paper, benefits and challenges of these three different technologies are presented, considering the Draugen platform in the North Sea as a base case. The Turboden 65-HRS unit is considered as representative of the organic Rankine cycle technology. Air bottoming cycles are analyzed and optimal design pressure ratios are selected. We also study a one pressure level steam Rankine cycle employing the once-through heat recovery steam generator without bypass stack. We compare the three technologies considering the combined cycle thermal efficiency, the weight, the net present value, the profitability index and payback time. Both incomes related to CO2 taxes and natural gas savings are considered. The results indicate that the Turboden 65-HRS unit is the optimal technology, resulting in a combined cycle thermal efficiency of 41.5% and a net present value of around 15 M$, corresponding to a payback time of approximately 4.5 years. The total weight of the unit is expected to be around 250 ton. The air bottoming cycle without intercooling is also a possible alternative due to its low weight (76 ton) and low investment cost (8.8 M$). However, cycle performance and profitability index are poorer, 12.1% and 0.75. Furthermore, the results suggest that the once-trough single pressure steam cycle has a combined cycle thermal efficiency of 40.8% and net present value of 13.5 M$. The total weight of the steam Rankine cycle is estimated to be around 170 ton.

scholarly journals Influence of moisture content of combusted wood on the thermal efficiency of a boiler

2017 ◽  
Vol 38 (1) ◽  
pp. 63-74 ◽  
Author(s):  
Ladislav Dzurenda ◽  
Adrián Banski
Keyword(s):  
Carbon Monoxide ◽  
Moisture Content ◽  
Flue Gas ◽  
Thermal Efficiency ◽  
Heat Losses ◽  
Flue Gases ◽  
Heat Power ◽  
Emission Standards ◽  
Negative Effect ◽  
Gas Loss

Abstract In the paper the influence of moisture content of wood on the heat losses and thermal efficiency of a boiler is analysed. The moisture content of wood has a negative effect, especially on flue gas loss. The mathematical dependence of the thermal efficiency of a boiler is presented for the following boundary conditions: the moisture content of wood 10-60%, range of temperatures of emitted flue gases from the boiler into the atmosphere 120-200 C, the emissions meeting the emission standards: carbon monoxide 250 mgm−3, fly ash 50 mgm−3 and the heat power range 30-100%.

scholarly journals Parametric Study of a Supercritical CO2 Power Cycle for Waste Heat Recovery with Variation in Cold Temperature and Heat Source Temperature

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6648
Author(s):  
Young-Min Kim ◽  
Young-Duk Lee ◽  
Kook-Young Ahn
Keyword(s):  
Heat Source ◽  
Thermal Efficiency ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Low Pressure ◽  
Power Cycle ◽  
Cooling Temperature ◽  
Source Temperature ◽  
Heat Source Temperature

The supercritical carbon dioxide (S-CO2) power cycle is a promising development for waste heat recovery (WHR) due to its high efficiency despite its simplicity and compactness compared with a steam bottoming cycle. A simple recuperated S-CO2 power cycle cannot fully utilize the waste heat due to the trade-off between the heat recovery and thermal efficiency of the cycle. A split cycle in which the working fluid is preheated by the recuperator and the heat source separately can be used to maximize the power output from a given waste heat source. In this study, the operating conditions of split S-CO2 power cycles for waste heat recovery from a gas turbine and an engine were studied to accommodate the temperature variation of the heat sink and the waste heat source. The results show that it is vital to increase the low pressure of the cycle along with a corresponding increase in the cooling temperature to maintain the low-compression work near the critical point. The net power decreases by 6 to 9% for every 5 °C rise in the cooling temperature from 20 to 50 °C due to the decrease in heat recovery and thermal efficiency of the cycle. The effect of the heat-source temperature on the optimal low-pressure side was negligible, and the optimal high pressure of the cycle increased with an increase in the heat-source temperature. As the heat-source temperature increased in steps of 50 °C from 300 to 400 °C, the system efficiency increased by approximately 2% (absolute efficiency), and the net power significantly increased by 30 to 40%.

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