During the coal boom of the 1970s, slurry pipelines were proposed as an alternative to rail transport. Coal would be crushed, then mixed with water to create a slurry and sent via pipeline to its destination, where the mixture was dried, then burned. When in the pipeline, the slurry moved along at a leisurely four miles an hour.
Coal water slurry (CWS)[6], [7] refers to a suspended dispersion system containing coal, water and a small amount of additives. Because of its fluidity, CWS is easy to transport by pipeline. However, the preparation of CWS need to consume a large quantity of water, which leads to the waste of water resources.
In the production process, noncompliant wastewater was treated and reused in industrial production, which can greatly reduce the consumption of fresh water and lessen pollutant emissions [4], [5]. Coal water slurry (CWS) [6], [7] refers to a suspended dispersion system containing coal, water and a small amount of additives.
The average size of fuel droplets in the jet decreases by 512% in comparison with twocomponent coalwater fuel. Ignition delay time of a single droplet of slurry at oxidizer temperature 1273 K increases by 23% in comparison with twocomponent coalwater fuel when 10% of coal is replaced by liquid pyrolysis products.
Coal is one of the most important fossil fuels in the world. In recent years, the demand for fossil fuel energy has increased. Coal water slurry (CWS) is composed of approximately 6075% coal, 2540% water, and 1% additives; it is environmentally friendly At present, the anionic additives used in industrial applications include naphthalenesulfonates, aliphatic sulfonates, lignin sulfonates ...
The attraction of the coalwater slurry is its complete independence of an oil supply; coaloil mixtures are effectively a means of extending oil supplies and are less economically beneficial. ... It is denoted that steam reforming is a suitable process for hydrogen production but purity of the product is a drawback of this system that can be ...
Coalwater slurry or coalwater mixture (CWS or CWM) is a complex solidliquid dispersion. Several research works have been done concerning the production and use of CWSs being developed worldwide in several different governmental, industrial and academic facilities. In the present paper, studies on the developments achieved in the past three decades with regard to the field mentioned ...
1. Introduction. Compared with coal gasification or steam reforming for hydrogen production [1], [2], water electrolysis for hydrogen had some advantages, such as clean, purity, mild conditions and so on [3], [4].However, water electrolysis also had some limitations, such as high energy consumption [5], low current efficiency [6].Therefore, there are many methods studied for saving energy and ...
Coal slurry pipeline transportation refers to the process of using highpressure pumps to continuously transport coal slurry through closed pipes to endusers ( Lahiri and Ghanta, 2008 ).
A numerical simulation analysis of the effects of O/C ratio and coal concentration in coal water slurry (CWS) on the flow and temperature fields of gasifier, gas composition, and carbon conversion ...
An experimental study of the ignition and combustion processes of coalwater slurry (CWS) droplets based on coal enrichment waste in a hightemperature oxidizer at 650850 °C with a syngas addition was carried out. The fuel slurry was a mixture of finely dispersed solid combustible particles (coal sludge, 10100 µm in size) and water. The syngas was a product of biomass pyrolysis and two ...
The temperature in the reactor was varied in the range of °C. An analysis of the composition of the gas obtained during the gasification of three fuels showed that the coalwaterslurry (40 wt% coal, 60 wt% water) was characterized by the maximum yield of H 2 ( vol%) and the minimum share of CO 2 ( vol%). The largest ...
One of the lots was of ultraclean coalwater slurry fuel (UCCSF) for which a twostage caustic and acid leaching procedure was developed to chemically clean the coal. As a part of the contract, AMAX R and D more » developed a conceptual design and preliminary cost estimate for a commercialscale process for UCCSF manufacture.
utilization: gasification process of BDO tarcoal water slurry Lirui Mao1, Hanxu Li,1*, Yuanchun Zhang2, Chengli Wu1, ... The main production process of BDO is the Reppe method. In the ...
As a part of clean coal technology, the coal water slurry has a popular application in the conventional and new thermal power stations. The hydrotransport is nowadays a preferred method, due to its low specific energy consumption and nonpolluting nature. The lignites and high ash coals, available in abundance, show poor slurryability, thereby making the process unsustainable.
To improve the efficiency of the gasification or combustion process of coal water slurry (CWS), it is significant to optimize the rheological properties and increase the solid concentration of CWS. Particularly, preparing CWS from low quality coal remains a peculiarly intriguing subject due to the large reserve and low price of low quality ...
According to coal demand and production forecasts, ... a coal gangue slurry with a watertogangue ratio of and a particle size of mm was selected for the simulation test of the caving ...
In this work, the pyrolysis behavior of coalwater slurry and coaloilwater slurry at various temperatures of °C in a fixed bed reactor was studied. For the pyrolysis of coalwater slurry and coaloilwater slurry, the increase of pyrolysis temperature and water content promoted an increase in gas production but resulted in a ...
ABSTRACT Oilfield wastewater was used to prepare coal slurry, which is called coaloilfield wastewaterslurry. The gasification properties of coaloilfield wastewaterslurry and coal water slurry were studied by using the thermogravimetry method, and the promoting effect of oilfield wastewater on gasification was also determined at the micro level. Results showed that coaloilfield ...
Coal water slurry (CWS) is an important cleancoalbased liquid fuel with the characteristics of highefficiency and lowpollution. This paper aims to implement the principles of clean production and prepare CWS by coblending coal particles and polyethylene terephthalate (PET) microplastics.
The three technology categories are considered as the "pulping", "pumping" and "endprocessing". The "pulping" category addresses technologies related to the production process of coalwater slurry. The "pumping" category addresses technologies related to the transport of coal slurry along a pipeline to its destination.
Abstract. Coalassisted water electrolysis can reduce the electricity consumption of traditional water electrolysis by 4060%, but the rate of hydrogen production in this process is very slow. Some coal gasification wastewater can promote the electrical oxidation of coal, the addition of which can achieve resource utilization of wastewater ...
Proximate analysis is an The CWS mixture is usually made by mixing 55 important quality control parameter for coal and coke. 70% coal and 3045% of water. The rotating blades of The proximate analyses are carried out by the TGA the coal mill are used to achieve a stable mixture. The 4000 equipment.
Coalwater slurry fuel is a fuel that is domestic, in large supply, can be handled like a liquid, burns like coal, costs like coal, and has the potential as a near term alternative to No. 6 fuel oil. Unlike the coal gasification and liquefication processes, the capital investment required is modest. While those synthetic fuel processes cost in ...
The production of coalwater slurry fuel involves the crushing of coal or coal sludge to particles between 10 and 65 micrometers diameter (standard crushers can be used); wet milling and homogenisation (with additives as required). The resulting product ( coal slurry) is then prepared for intermediate storage or transport.
Chu et al. [21] studied the mechanism of modified sludgecoal water slurry (MSCWS) and significantly improved the fluidity and stability of the slurry. Zhang et al. [22] used a coal chemical sludge as raw material and mixed it with lignite, coking coal and lean coal to prepare SCWS; it was shown that the addition of appropriate proportion of ...
Abstract. In this paper, based on Fluent software, a fivenozzle gasifier reactor was established to simulate the gasification process of oilbased drill cuttings coalwater slurry. The influence of concentration and oxygen/carbon atomic ratio on the gasification process of oilbased drill cuttings coalwater slurry was investigated.
Fig. 1 shows the production process of BDO tar [7]. ... Some chemical wastes mix into coalwaterslurry (CWS) in a proportion known as wastecoalwaterslurry (WCWS), which can control waste releases and recycle valuable resources. With the development of the gasification technology of CWS, the adaptability of raw materials is continually ...
Coal water slurry production process (equipment) to the clean, high efficiency and low energy with our country the atmosphere exceeds bid badly, leads toincreased haze weather, the coal water slurry production must be present, the domestic existing
Numerous excellent studies have reported on energysaving through CWS electrolysis. In 1979, Coughlin and Farooque [33] investigated CWS electrolysis, where the operational cell voltage ranged from to V, surpassing the theoretical value of V but still lower than the electrolysis of water at 2021, Chen [34] investigated the influence of coal rank on coalassisted water ...
Simplified block diagram of gasification process for syngas production. Coal slurry is first prepared by crushing the coal to a size of mm particle diameter along with water addition. The coal slurry is the pumped to the gasifier where the reactions take place in the controlled amount of oxygen.
© DZCrusher - كل الحقوق محفوظة
