Modified High Back-Pressure Heating System Integrated with Raw Coal Pre-Drying in Combined Heat and Power Unit

Chen, Heng; Qi, Zhen; Qiao, Chunming; Wu, Yunyun; Xu, Gang; Yang, Yongping

doi:10.3390/en11092487

Cited by 15 publications

(10 citation statements)

References 35 publications

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“…Moreover, it is a pre-requisite for any studies aiming at integration of such dryers, using low quality waste heat, into lignite power plants. This would allow one to compare potential savings of the use of novel solutions with energy savings, already demonstrated for existing lignite drying solutions, using drying agents at higher temperatures [34][35][36][37][38][39][40][41][42][43][44][45][46].…”

Section: Aims Scope and Novelty Aspects Of The Performed Workmentioning

confidence: 99%

Drying of Lignite of Various Origins in a Pilot Scale Toroidal Fluidized Bed Dryer using Low Quality Heat

et al. 2019

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An experimental study was carried out for lignites of different places of origin, i.e., Poland, Greece, Romania and Australia, using a toroidal bed dryer. The effect of the temperature on the drying efficiency, including the loss of moisture content over time under fixed drying conditions was the subject of the investigation. The main goal was to confirm the possibility of the use of a toroidal bed as a base for a drying system that could utilize low quality heat from sources such as flue gases from a boiler and determine the optimum parameters for such a system. The conducted study has conclusively proven the feasibility of the use of low temperature heat sources for drying lignite in a toroidal bed. A moisture content of 20% could be achieved for most of the tested lignites, using the toroidal bed, with reasonably short residence times (approx. 30 min) and an air temperature as low as 60 °C. Moreover, the change of the particle size distribution, to some degree, affected the final moisture content due to the entrainment of wet, fine particles. The study also determined that the in-bed attrition of the particles is partially responsible for the generation of fines.

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Section: Aims Scope and Novelty Aspects Of The Performed Workmentioning

confidence: 99%

Drying of Lignite of Various Origins in a Pilot Scale Toroidal Fluidized Bed Dryer using Low Quality Heat

et al. 2019

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“…For example, Wang et al [13] analyzed the characteristics of the four renovation schemes and discussed the influence of heat load and circulating water flow on the technological renovation combined with the actual renovation contents. Chen et al [14] proposed a high back pressure heating carried out to improve energy efficiency, and contribute to energy conservation, emission reduction and environmental protection. According to the requirements of the "Comprehensive Program of Work for Energy Conservation and Emission Reduction in the 13th Five-Year Plan" issued by the State Council, the task of the ultra-low emission renovation of 580 million kilowatt units will be accomplished by 2020 [6].…”

Section: Introductionmentioning

confidence: 99%

“…For example, Wang et al [13] analyzed the characteristics of the four renovation schemes and discussed the influence of heat load and circulating water flow on the technological renovation combined with the actual renovation contents. Chen et al [14] proposed a high back pressure heating According to existing literature, a great number of domestic and overseas scholars have mainly studied the technical route, energy-saving effect, project investment risk and economic benefits of cogeneration. In terms of technical routes, the common heat supply innovation technologies of generating unit perforation, air extraction, high back pressure, optical axis and heat pump are mainly studied.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Wang et al [13] analyzed the characteristics of the four renovation schemes and discussed the influence of heat load and circulating water flow on the technological renovation combined with the actual renovation contents. Chen et al [14] proposed a high back pressure heating system combined with the pre-drying of raw coal, in order to improve the performance of cogeneration units. In terms of energy-saving effects, the current research mainly focuses on two aspects: the contribution of cogeneration to reducing greenhouse gas emissions such as carbon dioxide from the macro level [15][16][17] and the analysis of the energy-saving measurement and emission reduction potential of cogeneration units at the micro level [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Research on the Economic Benefit Evaluation of Combined Heat and Power (CHP) Technical Renovation Projects Based on the Improved Factor Analysis and Incremental Method in China

Yang

Niu

et al. 2019

Sustainability

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With the increasingly prominent problems of resources and environment, thermal power enterprises in China are facing more severe challenges. To improve energy efficiency, a great number of thermal power enterprises implement the technical renovation of equipment. However, current methods cannot meet the needs of scientific and effective evaluations. In this context, the internal rate of return (IRR) is used as the main index to evaluate the economic benefits of the technical renovation of combined heat and power (CHP) plants. In order to improve the accuracy of the economic benefit evaluation results, the incremental cash flow is calculated through the incremental method, which is based on the existence and non-existence method, and the improved factor analysis method is utilized to eliminate the influence of price factors from markets that have no direct and definite relationship with the technical renovation. Then, the evaluation method is validated by taking a CHP technical renovation project in B city of China as an example. By comparing with other methods, the results show that the IRRs calculated by different methods are quite different, and the difference between the maximum and the minimum can reach 69.95%. The result of the method proposed in this paper is more reasonable and reliable and can effectively evaluate the economic benefits of CHP technical renovation projects.

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“…As a promising way to promote the CHP efficiency at a low cost, the HBP heating technology has attracted much attention over the past few years. Its adoption is encouraged in retrofitting power generation plants into cogeneration by the Chinese government [ 25 ]. The thermodynamic characteristics of the HBP heating system have been explored by several researchers [ 13 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Economic Analyses of Reformative Design for High Back-Pressure Heating in Coal-Fueled Cogeneration Units

Chen

et al. 2019

Entropy

Self Cite

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High back-pressure (HBP) heating technology has been identified as an effective approach to improve the efficiency of combined heat and power (CHP). In this study, the novel concept of a HBP heating system with energy cascade utilization is developed and its probability examined. In the reformative design, the extracted heating steam from the intermediate-pressure turbine (IPT) is first drawn to an additional turbine where its excess pressure can be converted into electricity, then steam with a lower pressure can be employed to heat the supply water. As a consequence, the exergy destruction in the supply water heating process can be reduced and the efficiency of the cogeneration unit raised. A detailed thermodynamic investigation was performed based on a typical coal-fired HBP–CHP unit incorporating the proposed configuration. The results show that the artificial thermal efficiency (ATE) promotion was as much as 2.01 percentage points, with an additional net power output of 8.4 MW compared to the reference unit. This was attributed to a 14.65 percentage-point increment in the exergy efficiency of the supply water heating process caused by the suggested retrofitting. The influences of the unit power output, unit heat output, supply water and return water temperatures and turbine back pressure on the thermal performance of the modified system are discussed as well. In addition, the economic performance of the new design is assessed, indicating that the proposed concept is financially feasible.

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Modified High Back-Pressure Heating System Integrated with Raw Coal Pre-Drying in Combined Heat and Power Unit

Cited by 15 publications

References 35 publications

Drying of Lignite of Various Origins in a Pilot Scale Toroidal Fluidized Bed Dryer using Low Quality Heat

Drying of Lignite of Various Origins in a Pilot Scale Toroidal Fluidized Bed Dryer using Low Quality Heat

Research on the Economic Benefit Evaluation of Combined Heat and Power (CHP) Technical Renovation Projects Based on the Improved Factor Analysis and Incremental Method in China

Thermodynamic and Economic Analyses of Reformative Design for High Back-Pressure Heating in Coal-Fueled Cogeneration Units

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