Application of Double-Used Absorption Heat Pump in Power Plants

2012 ◽  
Vol 542-543 ◽  
pp. 70-73 ◽  
Author(s):  
Xin Hui Cao ◽  
Guang Zhang ◽  
Xi Lun Wang ◽  
Yu Ning Zhang
Keyword(s):  
Power Plant ◽  
Energy Saving ◽  
Heat Pump ◽  
Power Plants ◽  
Waste Heat ◽  
Water Saving ◽  
Energy Utilization ◽  
Absorption Heat Pump ◽  
Quantitative Calculation ◽  
Steam Extraction

Absorption heat pump (AHP) heating in power plants in winter is an effective way to recover waste heat and make full use of energy. In this paper, quantitative calculation is taken to analyze the energy saving and economy efficiency of AHP heating in a power plant. The rate of energy utilization ηtp, the coal and water saving amount and the increased income of AHP heating are calculated. Results show AHP heating in power plants is superior to steam extraction heating both in energy saving and economy.

scholarly journals Economic Analysis of Heat Pump Recovery System for Circulating Water Waste Heat in Power Plant

2021 ◽  
Vol 256 ◽  
pp. 02011
Author(s):  
Ze Wang ◽  
Honghong Shen ◽  
Qunyin Gu ◽  
Daoyuan Wen ◽  
Gang Liu ◽  
...  
Keyword(s):  
Power Plant ◽  
Energy Saving ◽  
Heat Pump ◽  
Waste Heat ◽  
Heat Pumps ◽  
Water Saving ◽  
Absorption Heat Pump ◽  
Circulating Water ◽  
Cold Source ◽  
Heat Pump Unit

The use of heat pump technology to recover the waste heat of circulating water from the power plant instead of steam extraction for heating can not only improve the thermal efficiency of the unit and reduce the loss of cold source, but also has great advantages in energy saving. This paper uses absorption and compression heat pumps to recover the waste heat of circulating water in the power plant to study its energy-saving benefits. Under the same heating load, the economics of the two heat pumps are calculated and analyzed. The results show that the energy-saving benefits of absorption heat pump units are far greater than compression units. But in terms of water saving, the water saving capacity of the compression heat pump unit is higher than that of the absorption heat pump.

Influence of Temperature Parameter Change on Lithium Bromide Absorption Heat Pump Performance

2013 ◽  
Vol 291-294 ◽  
pp. 1670-1674
Author(s):  
Biao Li ◽  
Jiang Fan
Keyword(s):  
Power Plant ◽  
Heat Pump ◽  
Waste Heat ◽  
Lithium Bromide ◽  
Optimal Operation ◽  
Pump System ◽  
Absorption Heat Pump ◽  
Heat Pump System ◽  
Heat Pump Unit ◽  
The Impact

It is the new way of the thermal power plant energy conservation to recycling plant circulating water waste heat for heating with the heat pump technology. The recovery of low temperature waste heat is the background. And lithium bromide absorption heat pump is the object of this study. The impact of changes in temperature parameters on the performance of heat pump unit is analyzed. As a theoretical basis for the design of the heat pump system and power plant heat pump unit’s optimal operation provide a reference. The result provides a theoretical reference for the optimal operation of the heat pump system design and power plant heat pump units.

Thermodynamic Performance Analysis of a New CHP System With Absorption Heat Pump in a Direct Air Cooling Power Plant

2015 ◽  
Author(s):  
Hongsheng Zhang ◽  
Hongbin Zhao ◽  
Zhenlin Li
Keyword(s):  
Heat Pump ◽  
Power Plants ◽  
Waste Heat ◽  
Integrated System ◽  
Exergy Loss ◽  
Conventional Heating ◽  
Design Parameters ◽  
Air Cooling ◽  
Absorption Heat Pump ◽  
Energy And Exergy

A new waste heat recovery scheme based on absorption heat pumps (AHP) applied in CHP (Combined Heat and Power) system was proposed to decrease heating energy consumption of existing CHP systems by recovering waste heat of exhausted steam from a steam turbine of coal-fired direct air cooling units. Based on the establishment of thermodynamic analysis model, through adopting the design parameters of the 135 MW direct air-cooled power plants in China, the performances, especially the exergy losses of the unit as well as its subsystems mainly including six parts at different heating modes were obtained at one specific load. Compared with conventional heating mode, when the thermoelectric ratio is 100%, the power output increases around 3.81 MW, coal consumption rate decreases 11.69 g/(kW·h) and total exergy loss decreases 6.892 MW under 100% THA load, while the energy and exergy efficiencies of the integrated system increase 1.29 % and 1.25 %, respectively. Additionally, the change laws of total exergy loss, energy and exergy efficiency of integrated system at different loads also were studied. The results provide not only theory basis and scientific support for the design of the coal-fired power plants with absorption heat pump recovering waste heat, but also a new scheme of energy saving and optimization for the units.

scholarly journals An Improved System for Utilizing Low-temperature Waste Heat of Flue Gas from Coal-Fired Power Plants

2017 ◽  
Author(s):  
Shengwei Huang ◽  
Chengzhou Li ◽  
Tianyu Tan ◽  
Peng Fu ◽  
Gang Xu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Energy Saving ◽  
Flue Gas ◽  
Power Output ◽  
Power Plants ◽  
Waste Heat ◽  
Low Pressure ◽  
Steam Extraction ◽  
Pressure Steam ◽  
Net Power Output

In this paper, an improved system to efficiently utilize the low-temperature waste heat (WHUS) from the flue gas of coal-fired power plants is proposed based on heat cascade. The essence of the proposed system is that the waste heat of exhausted flue gas is not only used to preheat air for assisting coal combustion as usual but also to heat up feedwater and the low-pressure steam extraction. Preheated by both the exhaust flue gas in the boiler island and the low-pressure steam extraction in the turbine island, thereby part of the flue gas heat in the air preheater can be saved and introduced to heat the feedwater and the high-temperature condensed water. Consequently, part of the high-pressure steam is saved for further expansion in the steam turbine, which obtains additional net power output. Based on the design data of a typical 1000 MW ultra-supercritical coal-fired power plant in China, in-depth analysis of the energy-saving characteristics of the optimized WHUS and the conventional WHUS is conducted. When the optimized WHUS is adopted in a typical 1000 MW unit, net power output increases by 19.51 MW, exergy efficiency improves to 45.46%, and net annual revenue reaches 4.741 million USD. In terms of the conventional WHUS, these aforementioned performance parameters are only 5.83 MW, 44.80% and 1.244 million USD, respectively. The research of this paper can provide a feasible energy-saving option for coal-fired power plants.

scholarly journals Waste heat utilisation for cogeneration of energy

Mechanik ◽  
2017 ◽  
Vol 90 (3) ◽  
pp. 254-256 ◽  
Author(s):  
Robert Zarzycki ◽  
Marcin Panowski
Keyword(s):  
Power Plant ◽  
Energy Conversion ◽  
Heat Pump ◽  
Waste Heat ◽  
Cooling System ◽  
Hot Water ◽  
Absorption Heat Pump ◽  
Start Up ◽  
Heat Demand

The paper shows the analysis of potential of absorption heat pump (APC) application to increase the efficiency of source energy conversion in the cogeneration power plant, by recuperation of waste heat from oil cooling system. In the presented case, the purpose of APC implementation was to eliminate the number of start up of pick hot water boilers. Obtained results showed that the waste heat may be utilised during the highest heat demand which may lead to delay or even avoiding the pick boiler start up, owing to absorption heat pump implementation.

Economic Analysis of the Absorption Heat Pump in Supercritical Unit

2013 ◽  
Vol 291-294 ◽  
pp. 1666-1669
Author(s):  
Yun Li ◽  
Kai Song
Keyword(s):  
Low Temperature ◽  
Heat Pump ◽  
Power Plants ◽  
Waste Heat ◽  
Lithium Bromide ◽  
Environmental Benefits ◽  
Absorption Heat Pump ◽  
Practical Applications ◽  
Circulating Water ◽  
Central Heating

As an effective energy-saving device, the heat pump is environmentally friendly and advantageous in the recovery of low-temperature and middle-temperature waste heat. So it is increasingly being used in practical applications. The circulating water which is produced by power plants has a large number of low-temperature waste heat. It will bring huge economic and environmental benefits by using heat pump technology to recover those waste heat energy. The application of the heat pump in supercritical unit is discussed as the example of central heating project using waste heat in a power plant. And the basic principle of absorption heat pump is introduced. The economy, energy conservation and environmental benefits of lithium bromide absorption heat pump are also analyzed when it is used in 600MW supercritical unit.

scholarly journals Increase of thermal efficiency of cogeneration plant by waste heat utilisation with absorption heat pump

2019 ◽  
Vol 23 (Suppl. 4) ◽  
pp. 1101-1112
Author(s):  
Robert Zarzycki ◽  
Marcin Panowski
Keyword(s):  
Power Plant ◽  
Moisture Content ◽  
Heat Pump ◽  
Heat Generation ◽  
Thermal Efficiency ◽  
Electricity Generation ◽  
Waste Heat ◽  
Cogeneration Plant ◽  
Heating Season ◽  
Absorption Heat Pump

The very rapid growth of share of electricity generation from renewable sources is observed recent years. However, even if that share reaches about 50% in 2050, almost 50% of electricity will still be generated based on fossil fuels combustion rather than on nuclear energy. That means, energy generated from coal will still be important for the next decades. The largest sources of energy loses within the steam power plant is the steam cooling system. The energy dissipated to the atmosphere in that system is very difficult to be utilized mainly due to the relatively low temperature, and its direct utilization without additional equipment is rather impossible. The large amount of energy lost to the environment leads to low overall thermal efficiency of the plant, therefore, utilization of this energy should be of primary importance. The paper shows concept of increasing efficiency of cogeneration plant thermal cycle by utilisation of waste heat from flue gas with absorption heat pump, for the purpose of system heat generation. Calculations of combined system of power plant fuelled with biomass fuel with implemented waste heat utilisation system were performed for one heating season and different moisture content in the fuel. Results show, that owing to waste heat utilization instead of conventional heat exchanger, additional electricity generation during the heating season at even 46864 MWh may be achieved which is over 18% more for the moisture content in the biomass fuel at 0.5 kg/kg, the same ambient conditions and heat generation.

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