scholarly journals Optimization of Low Pressure Steam Heating Technology of Thermoelectric Joint Production

2021 ◽  
Author(s):  
Dongya Tang ◽  
Ruxian Yu
Keyword(s):  
Ambient Temperature ◽  
Simulation Software ◽  
Combined Cycle ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Joint Production ◽  
Heating Capacity ◽  
Load Rate ◽  
Design Values ◽  
Cycle Efficiency

In order to reduce the loss of heat saving in the thermal engine, improve energy utilization efficiency. This paper uses EBSILON simulation software to establish models and perform changes to the working condition, and the comparison of design values on the thermal balance graph. The results show that this method is applicable to the calculation of the thermoelectric gauge. At different heat supply and exhaust flow and the ambient temperature, the heat transfer characteristics of the unit is constantly changed. When the ambient temperature is less than 15∘C, the combined circulation thermal consumption rate is negative and the ambient temperature is negative, and the ambient temperature is higher than 15∘C time is positively correlated. When the heating capacity is greater than 300 gj/h, the combined cycle efficiency of the unit at the same heating rate is higher than the 100% load rate. Conclusion: the EBSILON simulation software is reliable.

Development of a Novel Combined Absorption Cycle for Power Generation and Refrigeration

2006 ◽  
Vol 129 (3) ◽  
pp. 254-265 ◽  
Author(s):  
Na Zhang ◽  
Noam Lior
Keyword(s):  
Water System ◽  
Rankine Cycle ◽  
Combined Cycle ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Cycle Performance ◽  
Base Case ◽  
Ammonia Water ◽  
Energy And Exergy ◽  
The Impact

Cogeneration can improve energy utilization efficiency significantly. In this paper, a new ammonia-water system is proposed for the cogeneration of refrigeration and power. The plant operates in a parallel combined cycle mode with an ammonia-water Rankine cycle and an ammonia refrigeration cycle, interconnected by absorption, separation, and heat transfer processes. The performance was evaluated by both energy and exergy efficiencies, with the latter providing good guidance for system improvement. The influences of the key parameters, which include the basic working solution concentration, the cooling water temperature, and the Rankine cycle turbine inlet parameters on the cycle performance, have been investigated. It is found that the cycle has a good thermal performance, with energy and exergy efficiencies of 27.7% and 55.7%, respectively, for the base-case studied (having a maximum cycle temperature of 450°C). Comparison with the conventional separate generation of power and refrigeration having the same outputs shows that the energy consumption of the cogeneration cycle is markedly lower. A brief review of desirable properties of fluid pairs for such cogeneration cycles was made, and detailed studies for finding new fluid pairs and the impact of their properties on cogeneration system performance are absent and are very recommended.

Review of a Combined Steam and Gas Turbine Cycle for Pipeline Service

1975 ◽  
Author(s):  
T. C. Heard
Keyword(s):  
Ambient Temperature ◽  
Gas Turbine ◽  
Combined Cycle ◽  
Drive System ◽  
Paper Briefly ◽  
Preliminary Study ◽  
Gas Turbine Cycle ◽  
Cycle Efficiency ◽  
Standard Gas ◽  
Regenerative Cycle

The combined steam and gas turbine cycle provides the highest efficiency turbine system available today. In view of the rapidly escalating value of fuel the combined cycle therefore merits a review for pipeline applications. Such a review reveals the combined cycle has a number of advantages. First, the combined cycle efficiency is significantly higher than the efficiency of a standard regenerative cycle gas turbine. Second, and contrary to the characteristics of a standard gas turbine, the efficiency at a given load improves significantly as the ambient temperature increases, so that the combined cycle would be applicable in hot climates. Third, the adjustable speed capability of the combined cycle meets the usual pipeline service requirements. This paper briefly presents the results of a preliminary study of a combined cycle single drive system as it might be utilized in a gas pipeline station.

Integration of Distributing Energy System II: Optimization

2012 ◽  
Vol 512-515 ◽  
pp. 1151-1155
Author(s):  
Jin Yang Wang ◽  
Guo Min Cui ◽  
Fu Yu Peng
Keyword(s):  
Digital Simulation ◽  
Energy System ◽  
Simulation Software ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Distributed Energy ◽  
Economic Operation ◽  
Distributed Energy System ◽  
Operation Parameters ◽  
Design Result

The optimization of the Distributed Energy System can improve the total energy utilization efficiency greatly and achieve energy saving. Based on the digital simulation software introduced by Part Ⅰ, the optimizations of matching parameters and structure can be achieved. The example results showed that numerical simulation can realize the optimization of matching parameters and economic operation parameters for the parts and the whole system, and the design result with the highest efficiency is obtained.

Techno Economic Evaluation of Biogas Integrated Parabolic Trough Solar Energy Combined Cycle

2013 ◽  
Vol 860-863 ◽  
pp. 22-31 ◽  
Author(s):  
Bo Zhao ◽  
Shan Rang Yang ◽  
Yu Ming Ding ◽  
Zhi Chao Liu ◽  
Ya Cai Hu
Keyword(s):  
Hybrid System ◽  
Power Production ◽  
Hybrid Plant ◽  
Combined Cycle ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Parabolic Trough ◽  
Electricity Cost ◽  
Generation Cost ◽  
Calculation Results

This paper presented a biogas-solar hybrid system and investigated the feasibility of using biogas to increase the enthalpy of parabolic trough collectors steam so as to increase the cycle efficiency and power production. High temperature anaerobic digestion (AD) was adopted to produce biogas by using corn straw, manure and sewage. Biogas fraction and energy-to-electricity efficiency were used to evaluate the biogas contribution to the electricity generation and the energy utilization efficiency based on off-design performance analysis respectively. A comprehensive levelized electricity cost (LEC) and life cycle assessment (LCA) for the hybrid system power production were performed. The simulation calculation results show that biogas utilization plays an important role in the decrease in systemic LEC and greenhouse gas emissions. Improvement is achieved in both of generation cost and greenhouse emissions for biogas-solar hybrid plant compared to solar-only plant.

A Novel Ammonia-Water Cycle for Power and Refrigeration Cogeneration

2004 ◽  
Author(s):  
Na Zhang ◽  
Ruixian Cai ◽  
Noam Lior
Keyword(s):  
Water System ◽  
Rankine Cycle ◽  
Combined Cycle ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Cycle Performance ◽  
Base Case ◽  
Reflux Ratio ◽  
Ammonia Water ◽  
Energy And Exergy

Cogeneration can improve the energy utilization efficiency significantly. In this paper, a new ammonia-water system is proposed for the cogeneration of refrigeration and power. The plant operates in a parallel combined cycle mode with an ammonia-water Rankine cycle and an ammonia refrigeration cycle, interconnected by absorption, separation and heat transfer processes. The performance was evaluated by both energy and exergy efficiencies. The influences of the key parameters, which include the rectifier operation pressure, reflux ratio and reboiler temperature, the basic working solution concentration, the cooling water temperature and the Rankine cycle turbine inlet parameters on the cycle performance, were investigated. It is found that the cycle has a good thermal performance, with energy and exergy efficiencies of 25% and 50.9%, respectively, for the base-case studied (having a maximum cycle temperature of 450°C). Comparison with the conventional separate generation of power and refrigeration having the same outputs, shows that the energy consumption of the cogeneration cycle is lower by 21.6%.

EFFECT OF AMBIENT TEMPERATURE ON THE PERFORMANCE OF A COMBINED CYCLE POWER PLANT

2013 ◽  
Vol 37 (4) ◽  
pp. 1177-1188 ◽  
Author(s):  
Arvind Kumar Tiwari ◽  
Mohd. Muzaffarul Hasan ◽  
Mohd. Islam
Keyword(s):  
Power Plant ◽  
Ambient Temperature ◽  
Thermal Power ◽  
Combined Cycle ◽  
Inlet Temperature ◽  
Exergy Destruction ◽  
Combined Cycle Power Plant ◽  
Combined Cycle Plant ◽  
Gas Turbine Cycle ◽  
Cycle Efficiency

The aim of the present paper is to examine the effect of ambient temperature on the performance of a combined cycle power plant. For this work, the combined cycle plant chosen is NTPC (National Thermal Power Corporation) Dadri, India where a gas unit of 817 MW is installed. The effect of ambient temperature on combined cycle efficiency, gas turbine cycle efficiency, exergy destruction in different components, exergy loss via exhaust and air fuel ratio at lower and higher turbine inlet temperature are reported. The results show that the net decrease in combined cycle efficiency is 0.04% and the variation in exergy destruction of different plant components is up to 0.35% for every °C rise in ambient temperature.

A New Superalloy Enabling Heavy Duty Gas Turbine Wheels for Improved Combined Cycle Efficiency

2017 ◽  
Author(s):  
Andrew Detor ◽  
◽  
Richard DiDomizio ◽  
Don McAllister ◽  
Erica Sampson ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Combined Cycle ◽  
Heavy Duty ◽  
Heavy Duty Gas Turbine ◽  
Cycle Efficiency

Regional integrated energy system schemes selection based on risk expectation and Mahalanobis-Taguchi system

2021 ◽  
pp. 1-18
Author(s):  
Jiahang Yuan ◽  
Yun Li ◽  
Xinggang Luo ◽  
Lingfei Li ◽  
Zhongliang Zhang ◽  
...  
Keyword(s):  
Energy Demand ◽  
Choquet Integral ◽  
Subjective Evaluation ◽  
Risk Attitude ◽  
Energy System ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Energy Structure ◽  
Fuzzy Measures ◽  
Integrated Energy System

Regional integrated energy system (RIES) provides a platform for coupling utilization of multi-energy and makes various energy demand from client possible. The suitable RIES composition scheme will upgrade energy structure and improve integrated energy utilization efficiency. Based on a RIES construction project in Jiangsu province, this paper proposes a new multi criteria decision-making (MCDM) method for the selection of RIES schemes. Because that subjective evaluation on RIES schemes benefit under criteria has uncertainty and hesitancy, intuitionistic trapezoidal fuzzy number (ITFN) which has the better capability to model ill-known quantities is presented. In consideration of risk attitude and interdependency of criteria, a new decision model with risk coefficients, Mahalanobis-Taguchi system and Choquet integral is proposed. Firstly, the decision matrices given by experts are normalized, and then are transformed to minimum expectation matrices according to different risk coefficients. Secondly, the weights of criteria from different experts are calculated by Mahalanobis-Taguchi system. Mobius transformation coefficients based on interaction degree are to calculate 2-order additive fuzzy measures, and then the comprehensive weights of criteria are obtained by fuzzy measures and Choquet integral. Thirdly, based on group decision consensus requirement, the weights of experts are obtained by the maximum entropy and grey correlation. Fourthly, the minimum expectation matrices are aggregated by the intuitionistic trapezoidal fuzzy Bonferroni mean operator. Thus, the ranking result according to the comparison rules using the minimum expectation and the maximum expectation is obtained. Finally, an illustrative example is taken in the present study to make the proposed method comprehensible.

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