Thermodynamic Analysis on a Heat-Power Decoupling System Integrated With Absorption Heat Pump

2020 ◽  
Author(s):  
Liyuan Wang ◽  
Ming Liu ◽  
Yue Fu ◽  
Jiping Liu ◽  
Junjie Yan
Keyword(s):  
Power Generation ◽  
Heat Pump ◽  
Consumption Rate ◽  
Heat Power ◽  
Coal Consumption ◽  
Absorption Heat Pump ◽  
Primary Network ◽  
Power Decoupling ◽  
Heating Load ◽  
Rate Of Heating

Abstract Because of the continuous expanding of the district heating, the heating load of combined heat and power (CHP) plants increases year by year. The minimum power load of CHP plant increases with the heating load due to the heat-power coupling mechanism. Therefore, heat-power decoupling is necessary to improve the operation flexibility for CHP units. Integrating the absorption heat pump (AHP) is an effective method to realize the heat-power decoupling. In this study, a 330MW CHP unit model and AHP model have been developed and validated. The performance of the heat-power decoupling and energy saving performance has been investigated by comparing the thermodynamic performance indicators. Results show that, the proposed system can increase the maximum heating load and decrease the power generation when the primary network return temperature is decreased. When the heating steam extraction is kept constant, with the increase of the primary network return water temperature, the heat generation efficiency and the standard coal consumption rate of heating increases, the coal consumption rate of power generation and the heating efficiency decreases. And the primary network return water temperature increases from 40 °C to 70 °C, the coal consumption rate of power generation decreases by 4.3 g/kWh, and the coal consumption rate of heating increases by 0.67 kg/GJ.

The Integrated Evaluation Index of Energy-Saving and Emission Reduction Generation Dispatching

2011 ◽  
Vol 382 ◽  
pp. 56-59
Author(s):  
Yong Hua Li ◽  
Jun Wang ◽  
Wei Ping Yan
Keyword(s):  
Power Generation ◽  
Energy Saving ◽  
Power Supply ◽  
Coal Combustion ◽  
Emission Reduction ◽  
Evaluation System ◽  
Power Plants ◽  
Consumption Rate ◽  
Coal Consumption ◽  
Reduction Effect

In China, coal combustion to generate electric power is the primary method, the energy-saving and emission reduction is the urgent task. At present, the energy-saving dispatching trial method in some area evaluates energy-saving and emission reduction of coal combustion power generation according to power supply coal consumption rate only. But the power supply coal consumption rate can’t reflect the energy-saving and emission reduction effect of coal combustion power plant overall. For example, the same coal combustion unit, the coal consumption rate is difference when desulfuration system is operating or not; the coal consumption rate of the unit with SCR will be increased; the coal consumption rate of the air-cooled unit is higher than water-cooled unit; etc.. This paper considers synthetically coal consumption rate, pollution emission, water resource wastage, etc., establishes a integrated evaluation system, adopts factor analysis method, gets the integrated evaluation system and index of energy-saving and emission reduction of coal combustion power generation, evaluates energy-saving and emission reduction effect of 5 power plants reasonable. The results show that the index can reflect the energy-saving and emission reduction level of coal combustion power generation.

scholarly journals Sensitivity Analysis and Optimization of Operating Parameters of an Oxyfuel Combustion Power Generation System Based on Single-Factor and Orthogonal Design Methods

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 998
Author(s):  
Zhiyu Zhang ◽  
Rongrong Zhai ◽  
Xinwei Wang ◽  
Yongping Yang
Keyword(s):  
Power Generation ◽  
Flue Gas ◽  
Consumption Rate ◽  
Orthogonal Design ◽  
Excess Oxygen ◽  
Operating Parameters ◽  
Generation System ◽  
Coal Consumption ◽  
Oxygen Coefficient ◽  
Power Generation System

The main purpose of this paper is to quantitatively analyze the sensitivity of operating parameters of the system to the thermodynamic performance of an oxyfuel combustion (OC) power generation system. Therefore, the thermodynamic model of a 600 MW subcritical OC power generation system with semi-dry flue gas recirculation was established. Two energy consumption indexes of the system were selected, process simulation was adopted, and orthogonal design, range analysis, and variance analysis were used for the first time on the basis of single-factor analysis to conduct a comprehensive sensitivity analysis and optimization research on the changes of four operating parameters. The results show that with increasing oxygen purity, the net standard coal consumption rate first decreases and then increases. With decreasing oxygen concentration, the recirculation rate of dry flue gas in boiler flue gas ( χ 1 ) and an increasing excess oxygen coefficient, the net standard coal consumption rate increases. The net electrical efficiency was just the opposite. The sensitivity order of two factors for four indexes is obtained: the excess oxygen coefficient was the main factor that affects the net standard coal consumption rate and the net electrical efficiency. The influence of oxygen concentration and oxygen purity was lower than that of excess oxygen coefficient, and χ 1 has almost no effect.

Research on Heat/Power Load Optimizing Distribution Model of Heating Units Based on Gene Sequencing Method

2014 ◽  
Vol 1008-1009 ◽  
pp. 562-566
Author(s):  
Wen Sheng Zhao ◽  
Xiao Dong Ding ◽  
Zhi Wang
Keyword(s):  
Consumption Rate ◽  
Thermal Power ◽  
Gene Sequencing ◽  
Distribution Model ◽  
Heat Power ◽  
Coal Consumption ◽  
Operating Condition ◽  
Sequencing Method ◽  
Power Load ◽  
Saving Effect

Based on the basic idea of biological gene sequencing method,“Shotgun Method”,this paper proposes a new method of heat/power load optimizing distribution,named as “Shotgun Method”.This method is mainly based on historical operating data of thermal power plant,and puts the reciprocal of fuel utilization coefficient in the physical sense—factory comprehensive standard coal consumption rate as thermal economic index.Through the calculation of thermal system of principle,every unit can get its own coal consumption characteristic equation,as the foundation operating condition library for the heat/power load distribution.“Shotgun Method” aims at minimum factory comprehensive standard coal consumption rate to establish mathematical model for seeking the best match between operating condition library of each unit.The application instance shows that this method is simple,practical,and the energy saving effect is remarkable.

A Novel Coal-Fired CHP System Integrated With Steam Ejectors to Realize Heat-Power Decoupling and Energy Saving

2020 ◽  
Author(s):  
Miaomiao Liu ◽  
Ming Liu ◽  
Shuran Zhao ◽  
Gege Song ◽  
Junjie Yan
Keyword(s):  
Energy Saving ◽  
Heat Load ◽  
Waste Heat ◽  
High Energy ◽  
Steam Turbines ◽  
Heat Power ◽  
Coal Consumption ◽  
Decoupling Method ◽  
Power Load ◽  
Power Decoupling

Abstract Traditional combined heat and power (CHP) units should run in the heat-controlled mode. The adjustable range of power load is restricted by the heat load, and the minimum power load increases with the heat load. Because of high penetration of intermittent renewable power, operational flexibility of CHP units is highly required. It is necessary to adopt some technical solutions to realize heat-power decoupling for CHP units. To find a heat-power decoupling method with low investment and high energy efficiency, the steam ejectors, simple in structure and low in cost, are applied to design a novel heat-power decoupling system in this study. Steam ejectors can recover the waste heat of exhaust steam of steam turbines. Therefore, the integration of steam ejector may realize heat-power decoupling and energy saving simultaneously. Three heat-power decoupling systems with steam ejectors are designed. The heat-power decoupling performance and energy consumption characteristics of these systems are investigated with a reference 330 MW coal-fired CHP unit. Results show that all three modified systems can realize heat-power decoupling. The heat-power decoupling performance of improved system III is the best, and improved system I has the least coal consumption rate for power generation.

Condensation Heat of Turbine Exhaust Steam Recycling Research in Combined Heat and Power System

2013 ◽  
Vol 448-453 ◽  
pp. 2203-2207
Author(s):  
Shao Hua Li ◽  
Long Gao ◽  
De Yong Che ◽  
Jing Lv ◽  
Zhang Bai
Keyword(s):  
Heat Pump ◽  
Heat Recovery ◽  
Negative Impact ◽  
Thermal Power ◽  
Coal Consumption ◽  
Optimization Analysis ◽  
Absorption Heat Pump ◽  
Simulation And Optimization ◽  
Good Energy ◽  
Turbine Exhaust

Condensation heat of turbine exhaust steam is not only failed to use reasonable and effective in traditional thermal power plant, but also had a huge negative impact on the environment in the form of thermal pollution. This paper has a comparative analysis in condensation heat recovery technology programs of turbine exhaust steam, which is taken a certain 200MW CHP unit as the application object. Simulation and optimization analysis of the absorption heat pump technology is made for optimizing system parameters and operating parameters. The coal consumption analysis shows that absorption heat pump has a good energy conservation and emission reduction benefits.

A novel solar energy integrated low-rank coal fired power generation using coal pre-drying and an absorption heat pump

2017 ◽  
Vol 200 ◽  
pp. 170-179 ◽  
Author(s):  
Cheng Xu ◽  
Pu Bai ◽  
Tuantuan Xin ◽  
Yue Hu ◽  
Gang Xu ◽  
...  
Keyword(s):  
Power Generation ◽  
Solar Energy ◽  
Heat Pump ◽  
Low Rank ◽  
Low Rank Coal ◽  
Absorption Heat Pump

scholarly journals Theoretical Design and Analysis of the Waste Heat Recovery System of Turbine Exhaust Steam Using an Absorption Heat Pump for Heating Supply

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6256
Author(s):  
Jinshi Wang ◽  
Weiqi Liu ◽  
Guangyao Liu ◽  
Weijia Sun ◽  
Gen Li ◽  
...  
Keyword(s):  
Heat Pump ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Absorption Heat Pump ◽  
Waste Heat Recovery System ◽  
Recovery System ◽  
Heat Recovery System ◽  
Heating Load ◽  
Turbine Exhaust

In northern China, many thermal power plants use absorption heat pump to recover low-grade heat from turbine exhaust steam due to the irreplaceable advantages of the absorption heat pump in waste heat recovery. In the process of designing a waste heat recovery system, few researchers have considered the relationship between the design power of the heat pump and the actual heating load of the heating network. Based on the heating load characteristics, this paper puts forward a design idea which uses an absorption heat pump to recover waste heat from a steam turbine exhaust for heating supply. The operation mode of the system for different design powers of the heat pump was stated. An economic analysis model of the waste heat recovery system was proposed, and the optimal design power of the heat pump could be obtained. For a specific unit, the corresponding waste heat recovery system was designed, and various factors affecting the economy of the system were discussed and analyzed in detail.

Integration Design and Performance Analysis of HAT Cycle Incorporated With Absorption Heat Pump

2007 ◽  
Author(s):  
Fan Wei ◽  
Yunhan Xiao ◽  
Shijie Zhang
Keyword(s):  
Power Generation ◽  
Heat Pump ◽  
Combined Heat And Power ◽  
Heat Pumps ◽  
Exhaust Gas ◽  
Water Recovery ◽  
Closed Cycle ◽  
Absorption Heat Pump ◽  
Open Cycle ◽  
Heat Transformer

The humid air turbine (HAT) cycle is a novel advanced gas turbine cycle. However, the conventional HAT cycle has many insufficiencies considering combined heat and power generation, water recovery and exhausts emission with low temperature. This study deals with these problems by integrating absorption heat pumps into the HAT cycle. Six types of absorption heat pumps, including the single stage open cycle absorption heat transformer (connect to the HAT cycle with simple and complex manner respectively), the two stage open cycle absorption heat transformer, the open cycle absorption heat pump with the single pressure, the closed cycle two stage absorption heat transformer and the closed cycle absorption heat pump, are incorporated into the HAT cycle. The integrated systems are simulated. The results indicate that while the electrical efficiency of the original HAT cycle is 56.48%, the cycle efficiencies of the above-mentioned integrated cycles are 50.53%, 55.15%, 51.07%, 46.88%, 57.52% and 46.25%, respectively. Water recovery can be achieved in each integrated system although the recovery effects are quite different. For the open systems, the water recovery levels depend on the pressure difference of the gas and the water. Full water recovery can be realized and the temperature of the exhaust gas can be kept high. The water recovery levels of the closed systems relate to the thermal capacity of the exhaust gas, and the emission of the low temperature exhaust gas is difficult. From the point of view of the combined heat and power generation, the temperature of the exhaust gas does not influence the quantity of the heat supply. Three integrated systems can be applied for the combined heat and power generation, the heat and power efficiency are 62.85%, 76.77% and 63.83% respectively. In general, the advantages of the HAT cycle combined with the absorption heat pump system are verified in the present paper.

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