A novel process for preparation of an ultra-clean superfine coal–oil slurry

Cui, Longlian; An, Liqian; Jiang, Hejin

doi:10.1016/j.fuel.2007.10.017

Cited by 29 publications

(15 citation statements)

References 14 publications

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“…A dynamic balance occurs between the coal pulverization and aggregation occurs when coal particle size is reduced to about 15.0 μm. When the coal particles reach this size, energy consumption drastically increases but there will be no further particle size reduction in ball mills (Cui et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Factors influencing environment and human health by cement industry

Zeb

Ali

Khan

2019

MEQ

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Purpose Cement industry for both developed and developing countries is important from the economic point of view. It is playing a vital role in economic development of a developing country like Pakistan. However, these industries are posing threat to the environment, human health and plant species. The purpose of this paper is to identify the most critical factors of cement industry that have a negative impact on the environment, human health and plant species in the context of Pakistan. Design/methodology/approach The factors are categorized into air pollution, noise pollution, soil pollution, human health and plant species. These factors are categorized on the basis of previous literature and environmental safety reports. Air pollution is caused by iron and sulphur while noise pollution is mainly caused by crusher room and rotatory kiln end. The soil is being polluted by zinc and lead while human health and plant species are being damaged by sulphur dioxide and nitrogen dioxide. For the analysis purpose, a multi-criteria decision-making (MCDM) technique, i.e., decision-making trial and evaluation laboratory (DEMATEL) is used. Findings The result shows that the major cause of air pollution is “sulphur” while “crusher room and rotatory kiln end” are responsible for noise pollution. On the other hand, “mercury” is responsible for causing soil pollution while human health and plant species are influenced by the toxic effect of “nitrogen dioxide.” Research limitations/implications The results obtained are specific to cement manufacturing industry of Pakistan and cannot be generalized for any other manufacturing sector. Practical implications The proposed methodology shows the most critical factors toward which concertation should be given for mitigating their impact. This study will help the government and the cement industry to focus on all those elements that are the most responsible for causing different types of pollution. Originality/value No such work is reported in previous research that proposes a framework using DEMATEL technique for analysis of critical factors of cement industries that have a dangerous impact on the environment and human health, especially in a developing country, like Pakistan.

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Section: Discussionmentioning

confidence: 99%

Factors influencing environment and human health by cement industry

Zeb

Ali

Khan

2019

MEQ

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“…Energy used for the grinding, washing and micronising of chars has not yet been empirically determined. Results for coal suggest that this value is approximately 60 kWh/t for an IsaMill, and up to 124 kWh/t for ultra fine commutation using a water jet mill . This represents a processing energy loss of 0.7 and 1.5%, respectively.…”

Section: Production Of Micronised Char Fuelsmentioning

confidence: 96%

Biomass char as a fuel for internal combustion engines

Ellem

Mulligan

2011

Asia-Pacific J Chem Eng

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Second generation liquid biofuels from lignocellulosic feedstocks are part of a suite of solutions to peak oil and a safe climate economy. Biofuels have technological advantages over electrification for applications with minimal refuelling or recharging options such as air travel, shipping, agriculture and low or intermittent frequency trucking and rail. We examined a fuel production concept combining slow pyrolysis chars and superfine commutation. Char is micronised and suspended in diesel or water to create a reduced cost, quality and energy density liquid biofuel. Process yields and efficiencies were derived from a review of the slow pyrolysis char, coal commutation and combustion literature and used to develop theoretical estimates of process performance. Char structure and composition were also reviewed in the context of commutation and management of ash and alkalis in the fuel. The paper concluded that char based fuels had potential applications where cost was critical, but quality was not, such as diesel engines for agriculture, trucks, trains, shipping and backup electricity supply. Char water fuels increase safety by being non-flammable and are environmentally benign, a valuable trait in sensitive environments such as coastal shipping.

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“…Their studies included a comparison of combustible matter recovery, ash content of the clean coal, separation efficiency, and energy consumption between the new and traditional coal preparation process. They had encouraging results which led them to propose a process for preparation of ultra-clean superfine coal-oil slurry (Cui et al 2008). Results obtained from their studies validated the unique advantages of highpressure waterjet comminution for developing coal slurry as a viable alternative energy resource.…”

Section: Introductionmentioning

confidence: 93%

Application of the fractal theory for evaluating effects of coal comminution by waterjet

Galecki

Akar

et al. 2014

Int J Coal Sci Technol

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Comminution of coal to ultrafine sizes by high-pressure waterjet provides a novel method for preparation of coal-water fuels for next generation, near-zero emission electric power generation. The particle size distribution (PSD) of ground coal is a key parameter in the preparation of slurries as it determines the settling behavior of the particles and viscosity of the coal-water mixture. There are several methods available for representation and evaluation of particle size analysis data. However, fractal theory provides a means by which the entire PSD of comminuted materials can be quantified by using of a specific and exact value. In this paper, a volume-based fractal model was deduced to characterize the PSD of the coal which is ground in a specially designed comminution cell. During the size reduction process, the inlet pressures up to 276 MPa were used.

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A novel process for preparation of an ultra-clean superfine coal–oil slurry

Cited by 29 publications

References 14 publications

Factors influencing environment and human health by cement industry

Factors influencing environment and human health by cement industry

Biomass char as a fuel for internal combustion engines

Application of the fractal theory for evaluating effects of coal comminution by waterjet

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