Spontaneous coal combustion producing carbon dioxide and water

Deng, Cunbao; Wang, Jiren; Wang, Xuefeng; Deng, Hanzhong

doi:10.1016/s1674-5264(09)60165-4

Cited by 9 publications

(9 citation statements)

References 10 publications

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“…Constraint (4) indicates that the quantity of material in storage is less than or equal to the maximum supply. Constraint (5) ensures that when the maximum supply of the material is less than or equal to the lower bound of the demand, the material is warehoused according to the maximum supply of the material.…”

Section: Emergency Materials Storage Planning Modelmentioning

confidence: 99%

“…When conducting risk measurement studies, there are many types of risks, all with different grades. First, major public emergencies are graded for the specific conditions of the Chengdu-Chongqing region [5]. At the same time, the frequency of occurrence, the degree of hazard, and the ability of the Chengdu-Chongqing region to withstand disasters are quantified and graded, and risk measurement values are calculated to produce relatively objective measurement indicators.…”

Section: Introductionmentioning

confidence: 99%

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The Optimization of Emergency Logistics Based on Quantitative Risk Measurement

Deng

Zhang

2023

E3S Web Conf.

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High-risk societies are uncertain, ambiguous and unpredictable. Risk fluctuations are prone to the intertwining and overlapping of various accident hazards and safety risks. China is prone to the interweaving and overlapping of various accident hazards and safety risks, which leads to an increase in the number of factors affecting public safety as well [1]. Therefore, this paper will quantify specific ranking indicators in terms of frequency of hazards, degree of hazards and vulnerability to different hazards. The ranking is based on the quantified results in red, yellow and green and the hazard risk level is calculated according to the risk formula. This study will take the Chengdu-Chongqing region as an example and optimise the storage of materials in the emergency logistics base in order to maximise the precise and rapid supply of materials to the main demand points. The efficiency of emergency material deployment will be further improved and emergency materials will be well secured.

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Section: Emergency Materials Storage Planning Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Optimization of Emergency Logistics Based on Quantitative Risk Measurement

Deng

Zhang

2023

E3S Web Conf.

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“…At a pressure of about 40 at carbon dioxide is cooled and supplied at its own pressure with saturated steam. It is stored in tanks at pressures between 8 and 22 bar and temperatures between −43 and −17 • C. Under normal pressure, carbon dioxide passes from the solid state to the gaseous state (sublimates), omitting the liquid phase at −78.5 • C. Under increased pressure (5.1 at) it can be liquefied at −78.5 • C. One kilogram of liquid carbon dioxide is obtained after degassing at +15 • C and 0.1 MPa 555 dm 3 of gaseous carbon dioxide [62].…”

Section: The Properties Of Carbon Dioxide and Technical Conditions For Its Usementioning

confidence: 99%

The Method of Combating Coal Spontaneous Combustion Hazard in Goafs—A Case Study

et al. 2020

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One of the major natural hazards occurring during the process of mining exploitation are endogenous fires. They cause very large material losses and constitute a threat to the health and life of the workers. Such fires usually start and develop in the goafs. The remaining coal and the oxygen-containing air flowing at a certain rate may lead to endogenous fires. The basic element of the assessment of the occurrence of an endogenous fire and the degree of its development is the chemical composition of the air flowing out of the longwall and the goafs. The monitoring of this composition also makes it possible to assess the severity of such a fire. The damage that can be caused by the endogenous fire requires scientific and experimental research being carried out on a wide scale in order to limit its occurrence and development. All papers and research mentioned in the paper aim to find a tool that will help to control the fires. The paper discusses the development of a new and original method of combating the threat of endogenous fires. It is based on the installation designed to feed an ash and water mixture or an ash and water mixture with carbon dioxide to goafs. The foundation of the paper is a method based on a vast depth of expertise and knowledge gained by the authors in the field of combating endogenous fires. The developed installation prepares and transports ash and water mixtures together with carbon dioxide to the zones with high probability of endogenous fires. The mixture is a preparation of the surface of a mine, and later, it is transported underground by pipelines to the goafs where a high level of the fire hazard was identified. The construction of the system and the composition of the mixture used are both original solutions; their practical application limited the process of spontaneous heating of coal. Monitoring the chemical composition of gases in the air of the goafs made it possible to control the effects of applied measures; it proved that carbon dioxide used as an inert gas disturbs the process of carbon oxidation, and the water and ash mixture limits the inflow of the air with oxygen. The advantage of the method is particularly evident in the case of the exploitation of deposits where coal has a short incubation time. This original approach allows for a better and more effective response to endogenous fires.

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“…In semiconductor processing, nuclear physics and surface science, molecular pump is a key vacuum extractor [1,2]. The vacuum manufacturers in the world are working hard to develop various types of molecular pumps.…”

Section: Introductionmentioning

confidence: 99%

Clamping Accuracy Detection and Display System of Integral Turbine-rotor in Molecular Pump

Zhao

Yang

Liu

et al. 2011

AMR

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Molecular pump with magnetic suspension is an important vacuum extractor. The machining accuracy of turbine-rotor has crucial influence on the key parameters of molecular pump, such as pumping speed, compression ratio. A clamping accuracy detection and display system of semi-fished turbine-rotor was established. The maximum coaxiality error and its position could be detected, displayed and recorded easily. With a precision fine tuning device, coaxiality error could be reduced from 30µm to 10µm. This system effectively reduces the turbine-rotor’s centrifugal force, and increases the stability of molecular pump with magnetic suspension.

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Spontaneous coal combustion producing carbon dioxide and water

Cited by 9 publications

References 10 publications

The Optimization of Emergency Logistics Based on Quantitative Risk Measurement

The Optimization of Emergency Logistics Based on Quantitative Risk Measurement

The Method of Combating Coal Spontaneous Combustion Hazard in Goafs—A Case Study

Clamping Accuracy Detection and Display System of Integral Turbine-rotor in Molecular Pump

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