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Future of lignite resources: a life cycle analysis

At present, there are two kinds of mainstream technologies to improve the quality of lignite. The first one is drying technologies, which remove the external water via heating; however, it does not affect the internal water and volatiles (Zhang 2014; Jangam et al. 2011).

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Cyclone rotational drying of lignite based on particle high …

Additionally, the influence of gas temperature, particle size, cyclone diameter and series on the drying efficiency of lignite was experimentally studied, and the changes in the properties and pore structure of lignite after drying were discussed through a variety of testing methods, thereby opening up a new path for the drying technology in ...

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Cyclone rotational drying of lignite based on particle high …

The cyclone rotational drying process developed in this study can achieve lignite drying with low energy consumption and high efficiency.

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An efficient and low-cost solar-aided lignite drying power …

A new solar-aided power generation system is proposed. It is based on the unique characteristics of non-concentrating and concentrating solar energy applied to lignite drying. In the new system, solar energy cascade utilisation is achieved by the two-stage solar drying of lignite. Solar irradiance, especially diffused irradiance, can be efficiently used in the new system at a …

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Innovative Drying Technology Extracts More Energy from …

An innovative coal-drying technology that will extract more energy from high moisture coal at less cost and simultaneously reduce potentially harmful emissions is ready for commercial use after successful testing at a Minnesota electric utility. ... Lignite is one of four major coal types produced in the United States, accounting for about 7 ...

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A novel lignite pre-drying system with low-grade heat

The lignite pre-drying process plays an important role in modern lignite power plants and the fluidized bed dryer with internal heat utilization is a promising drying method …

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SUPER-HEATED STEAM DRYING: AN INNOVATION OF …

The mechanism experiment research and pilot-scale test research of the super-heated steam drying technology for lignite were carried out, and the results show that the drying efficiency of …

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Theoretical Analysis and Optimization of Fine Lignite Drying …

We established a pulsed fluidized bed system to dry and concurrently separate fine lignite (−6 + 3 and −3 + 1 mm lignite). The kinetics and evaporation of lignite moisture were investigated in the pulsed air flow.

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Cyclone rotational drying of lignite based on particle high …

The lignite drying is the keys to its efficient and clean utilization, but the high energy consumption restricts the sustainable development of drying technology. In this study, based on the coupling centrifugal effect of high-speed self-rotation and revolution of particles in cyclone, low-energy consumption and high-efficiency lignite cyclone rotational drying was realized at a …

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Lignite drying with solar energy: Thermodynamic analysis and …

Therefore, solar drying is a potential technology that should be promoted in lignite-deposited areas. Moreover, the influence of main parameters on the performance of system was analyzed. Dryer efficiency is determined to have significant influence on …

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Lignite Drying: New Coal-Drying Technology Promises …

The project is demonstrating the Lignite Fuel Enhancement System, which uses waste heat to dry fuel before it is fed into the boiler. Typically, about 45% of the fuel heat put into a conventional pulverized coal-fired power plant is lost in the condenser; another 20% exits the stack. The LFES …

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Drying and depolymerization technologies of Zhaotong lignite…

Zhaotong lignite (ZL), a soft lignite from southwest of China, is an abundant coal resource. However, it has not been utilized on large scale due to its very high moisture content and low calorific value.Drying and depolymerization technologies of ZL for upgrading or producing valuable gases, value-added chemicals, and/or liquid fuels have been widely investigated in …

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Drying and depolymerization technologies of Zhaotong lignite…

Drying of lignites is usually needed prior to long distance transportation or utilization. Various drying technologies such as thermal upgrading, hydrothermal dewatering (HTD), and mechanical thermal expression (MTE) have been developed [29, 30].Certainly, these methods were used to dry ZL for obtaining upgraded ZL.

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Report on comparison among current industrial scale lignite drying

The CRC Lignite reported on the successful trial of the CRC's MTE process for drying lignite and concluded that this technology could provide a low cost, energy efficient process for partial drying (down to around 30% moisture) at the large scale required for power plant feed.

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Innovative Drying Technology Extracts More Energy from …

An innovative coal-drying technology that will extract more energy from high moisture coal at less cost and simultaneously reduce potentially harmful emissions is ready for commercial use after successful testing at a Minnesota electric utility.

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Lignite Drying: New Coal-Drying Technology Promises Higher Efficiency

The U.S. Department of Energy (DOE) and Great River Energy are testing a new coal-drying technology that could dramatically reduce the emissions of lignite-burning power plants.

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Lignite Drying Technology

Lignite Drying Technology. Improve Quality and Efficiency—Tianli Energy's Lignite Steam Rotary Drying Technology. Lignite is a low-grade coal with high moisture content, high volatile content, low calorific value, and low ignition point. At present, with the near-mining of high-quality coal in China, brown coal has become the main coal used ...

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Innovative Drying Technology Extracts More Energy from …

An innovative coal-drying technology that will extract more energy from high moisture coal at less cost and simultaneously reduce potentially harmful emissions is ready for commercial use …

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Future of lignite resources: a life cycle analysis

At present, there are two kinds of mainstream technologies to improve the quality of lignite. The first one is drying technologies, which remove the external water via heating; …

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IEA CCC report on drying lignite

These modern pre-drying processes will also benefit future lignite power plants with CO 2 capture. The report, Techno-economics of modern pre-drying technologies for lignite-fired power plants, CCC/241 by Nigel Dong, 46 pp, September 2014) is available for download from the IEA Clean Coal Centre Bookshop. Edited from various sources by Sam Dodson

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An efficient and low-cost solar-aided lignite drying power …

Two-stage solar drying of lignite is applied for solar energy cascade utilisation. Solar energy fluctuations are solved by dried coal storage. High thermal and economic …

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A novel lignite pre-drying system with low-grade heat

The lignite pre-drying process plays an important role in modern lignite power plants and the fluidized bed dryer with internal heat utilization is a promising drying method which has both high efficiency and cost-effectiveness.

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An efficient and low-cost solar-aided lignite drying power …

Two-stage solar drying of lignite is applied for solar energy cascade utilisation. Solar energy fluctuations are solved by dried coal storage. High thermal and economic performances are achieved. A new solar-aided power generation system is proposed.

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Expert control system–based multimode hybrid switching control …

Thermal runaway is a critical feature of microwave lignite drying, which leads to the combustion of lignite. An expert control system (ECS)-based multimode hybrid switching control strategy is developed to solve it. The control strategy has three control modes, which contain two proportional integral derivative modes and a zero mode.

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Retrofitting lignite plants to improve efficiency and …

4.5 Lignite drying and demineralisation 34 4.5.1 WTA lignite dryer (RWE) – fluidised bed drying with internal waste heat utilisation 36 4.5.2 DryFining™ technology: dewatering and mineral segregation 37 5 Nitrogen oxide abatement 41 5.1 Low NOx burners 43 5.2 Selective catalytic NOx reduction, SCR 46

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Hot-air drying behavior of lignite and quantitative …

In this study, the dehydration, surface damage, and pulverization behaviors of lignite were investigated under hot-air drying conditions, and the effect of the dewatering process on shrinkage cracking was analyzed.

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Theoretical Analysis and Optimization of Fine Lignite Drying …

We established a pulsed fluidized bed system to dry and concurrently separate fine lignite (−6 + 3 and −3 + 1 mm lignite). The kinetics and evaporation of lignite moisture were investigated in …

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Hot-air drying behavior of lignite and quantitative …

In this study, the dehydration, surface damage, and pulverization behaviors of lignite were investigated under hot-air drying conditions, and the effect of the dewatering …

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Integration of evaporative dryers into lignite-fired power …

Various dryers have been developed to dry lignite, and evaporative drying technologies are commonly applied. Nevertheless, the evaporative drying is an energy intensive process. When evaporative dryers are integrated within power plants, the waste heat of power plants can be used to dry lignite, thereby increasing the efficiency of power plants.

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SUPER-HEATED STEAM DRYING: AN INNOVATION OF …

The mechanism experiment research and pilot-scale test research of the super-heated steam drying technology for lignite were carried out, and the results show that the drying efficiency of the super-heated steam is better than the hot air at given conditions, the lignite drying can be accomplished stably and continuously and the drying product c...