Study on pulping performance of a novel coal water slurry additive for Shenhua coal slurry with high concentration

2011 ◽  
Author(s):  
Fu-er Zheng ◽  
Yifan Liu ◽  
Minghua Liu
Keyword(s):  
Coal Slurry ◽  
High Concentration ◽  
Water Slurry ◽  
Coal Water Slurry

Improvement of sustainability and efficiency of urban heating using coal-water slurry fuel

2021 ◽  
Vol 3 ◽  
pp. 18-22
Author(s):  
Vasily Murko ◽  
Oksana Chernikova
Keyword(s):  
Heat Generation ◽  
Cost Efficiency ◽  
Coal Slurry ◽  
Coal Burning ◽  
Equipment Replacement ◽  
Water Slurry ◽  
Coal Water Slurry ◽  
New Construction ◽  
Cost Efficient ◽  
The City

Coal-water slurry fuel is coming into use in heat generation facilities as an alternative to natural gas and heavy oil. The main advantage of coal slurry is its cost efficiency. Our project is devoted to improvement of heat generation using coal-water slurry fuel instead of investing in new construction of coal-burning boiler houses. As an example, we considered implementing this project in the city of Leninsk-Kuznetsky, Russia. The project implies partial burning of coal slurry along with conventional coal burning. This solution is cost efficient and environmentally friendly yet not requiring major heat generation equipment replacement or renovation. The total cost efficiency of the suggested project is estimated at least as 1.1 billion rubles per year.

scholarly journals Combustion of coal water slurry-technology enabling the achievement of a reduced technical minimum of the boiler

2019 ◽  
Vol 82 ◽  
pp. 01004 ◽  
Author(s):  
Krzysztof Głód ◽  
Janusz Lasek ◽  
Krzysztof Słowik ◽  
Jarosław Zuwała
Keyword(s):  
Coal Slurry ◽  
Research History ◽  
Water Slurry ◽  
Fine Coal ◽  
Coal Sludge ◽  
Coal Water Slurry ◽  
Close Relationship ◽  
Slurry Technology

The idea of combustion of suspended fuels was developed in the 1980s. The largest producer and user of slurry fuels (Coal Water Slurry, CWS) is China [3]. Despite of several decades of CWS research history, investigations are still carried out to improve the parameters of disperse fuels and to improve the combustion of these fuels. The close relationship between the properties of slurry fuels and number of parameters (mainly the type and properties of the coal feedstock) generates the necessity of CWS receipts and determines for what purposes the fuel may be destined. In the case of the use of coal sludge, the resulting slurry allows for the combustion / "disposal" of coal slurry in pulverized boilers. In the case of using better quality fine coal fractions in CWS production, a slurry will be created allowing for achieving the crucial technological goal such as operation of power units with a reduced technical minimum.

Dispersion mechanism of coal water slurry prepared by mixing various high-concentration organic waste liquids

Fuel ◽  
2021 ◽  
Vol 287 ◽  
pp. 119340
Author(s):  
Shuangni Wang ◽  
Jianzhong Liu ◽  
Sarma V. Pisupati ◽  
Dedi Li ◽  
Zhihua Wang ◽  
...  
Keyword(s):  
Organic Waste ◽  
High Concentration ◽  
Water Slurry ◽  
Dispersion Mechanism ◽  
Coal Water Slurry

scholarly journals Technical Lignosulfonates Effect on Weld Corrosion in a Coal-Water Slurry

2019 ◽  
pp. 89-98
Author(s):  
V.A. Shelontsev ◽  
I.G. Gorichev ◽  
A.V. Kuzin ◽  
E.A. Eliseeva
Keyword(s):  
Particle Size ◽  
Rheological Properties ◽  
Base Metal ◽  
Welded Joints ◽  
Solid Phase ◽  
Combustion Efficiency ◽  
Coal Slurry ◽  
Galvanic Couple ◽  
Water Slurry ◽  
Coal Water Slurry

Hydrotransport of coal, iron ore, bauxite and other solid materials is known to be carried out through trunk pipelines. Hydrotransport of coal in the form of highly concentrated coal-water slurries (HCCWS) makes it possible to solve a whole range of problems from environmental ones to those when HCCWS are used as a fuel for energy boilers. The HCCWS combustion efficiency is determined by the concentration of the solid pulp phase and the particle size. The highest HCCWS combustion efficiency is observed when the mass concentration of the solid phase is 60--65 % and the particle size is up to 0.02 sm. In order to achieve stability of these slurries with the solid phase concentration, various additives are used to improve the rheological properties of coal-water slurries. In particular, such plasticizing agents as sodium tripolyphosphate, technical lignosulfonates, carbon-alkaline reagents and others are used. Plasticizing agents are known to change the rheological properties of coal-water slurries but the problems of corrosion activity of plasticizing agents are not well understood, especially with respect to welded joints of pipelines. Welded joints of slurry pipelines can be represented as macro-galvanic couples, in which the weld and base metal are electrodes of a galvanic element. The current magnitude of the macro-galvanic couple can be used to calculate the local corrosion value due to the work of the galvanic element of the base metal and the weld. The paper studies the effect of technical lignosulfonates (TLS) and TLS-based compositions in a coal-water slurry on the local currents of the base metal --- weld macro-galvanic couple made of 09G2S steel. Findings of research show that in the water-coal slurry the maximum inhibitory effect is observed when 0.75 % TLS + 0.25 % K2CrO4 (Na2CO3) is added to the slurry.

Effect of Particle Size Distribution and Selective Alcohol Additives for Preparation of High Concentration Coal-Water Slurry

2020 ◽  
Vol 12 (2) ◽  
pp. 102-111 ◽  
Author(s):  
Debadutta Das ◽  
Anupama Routray ◽  
Swetashree Pattanaik ◽  
Pankaj K. Parhi ◽  
Bijnyan R. Das ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Static Stability ◽  
Industrial Applications ◽  
High Concentration ◽  
Oh Groups ◽  
Water Slurry ◽  
Coal Water Slurry ◽  
Water Alcohol

Background: The alternative of oil is highly essential in the present context due to the acute shortage of oil as well as increasing demand for it from different public and private sectors. Since 1980, attention has been focused on coal-water slurry as an alternative fuel for the power generation industry and a suitable substitute for oil in several industrial applications. One of the exciting areas in Coal Water Slurry (CWS) is coal–water-alcohol slurry in which different alcohol compound can act as a dispersant for the stabilisation of coal–water slurry. Objective: The objective of this paper is to prepare a high concentration coal–water-alcohol slurry using glycerol, glycol and ethanol as an additive, and different particle size distribution of coal. This will increase the surface activity of the coal thereby, decreasing the viscosity of the slurry. Method: Two bimodal samples are prepared in which coarse particles are (212 μm - 300 μm), (150 μm – 212 μm) and fine particle below 75 μm. Three types of alcohol additive namely glycerol, glycol and ethanol are used as a dispersant. Malvern Particle size analyzer is used to measure the particle size distribution of the coal samples. Rheological study of CWAS was conducted using HAAKE RHEO STRESS 1. Result: From the experiment, it has been concluded that the optimum addition of glycerol in water is taken as 90:10 of water and glycerol ratio because after that, there is no further decrease in the value of viscosity. An optimum value of glycol and ethanol mixed in water was determined and found as in the ratio of 86:14 and 82:18, respectively. Conclusion: From different parameter studies like coal concentration, pH, temperature, apparent viscosity and stability, it has been concluded that coal-water-glycerol slurry is better than other coal water- alcohol slurry. This is because of the presence of more OH- groups in glycerol. The static stability of this coal-water-alcohol slurry exists for the maximum period of 31 days.

The Autoignition and Combustion of Coal-Water Slurry Under Simulated Diesel Engine Conditions

1986 ◽  
Vol 108 (4) ◽  
pp. 654-660 ◽  
Author(s):  
D. L. Siebers ◽  
T. M. Dyer
Keyword(s):  
Diesel Engine ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Ignition Delay ◽  
Combustion Characteristics ◽  
Design Parameters ◽  
Coal Slurry ◽  
Water Slurry ◽  
Coal Water Slurry

The combustion characteristics of a coal-water slurry spray were examined under diesel engine conditions. A two-stage combustion process was used to simulate the diesel engine conditions in a constant-volume combustion bomb. The combustion characteristics investigated were ignition delay, ignition site, combustion development, combustion duration, and combustion completeness. The results show that the ignition delay of the coal-water slurry fuel is temperature and pressure dependent. Also, the coal slurry ignition delay is approximately a factor of five longer and the energy release rate is significantly slower in comparison to the ignition delay and energy release rate for conventional No. 2 diesel fuel. The combustion of the slurry spray was incomplete for all test conditions due to the impingement and the adherence of the coal slurry on the wall. This fundamental testing provides insight into engine design parameters which must be considered if coal-water slurry is to be used in practice.

Fabrication and Preparation of Coal-Water Slurry Dispersant with Amphoteric Polycarboxylate

2011 ◽  
Vol 335-336 ◽  
pp. 1257-1261
Author(s):  
Jun Feng Zhu ◽  
Guang Hua Zhang ◽  
Zhuo Miao ◽  
Hao Hao
Keyword(s):  
Aqueous Solution ◽  
Polyethylene Glycol ◽  
Coal Slurry ◽  
Trimethylammonium Chloride ◽  
Water Slurry ◽  
Fine Coal ◽  
Dispersion Agent ◽  
Cationic Monomer ◽  
Coal Water Slurry ◽  
Better Than

Coal-water slurry （CWS）dispersant is a key to prepare fine coal-water slurry. A novel amphoteric polycarboxylic (AmPC) dispersant for CWS was copolymerized in aqueous solution by comonomers methacrylate polyglycol monoester (PA), propylene sulfur sodium (SAS) and cationic comonomer methacryloyloxy ethyl trimethylammonium chloride(DMC).Methacrylate polyglycol monoester was prepared by direct esterifying with methacrylate acid (AA) and polyethylene glycol (PEG) in our laboratory. And then, The molecule structure of amphoteric polycarboxylic dispersant was characterized by FTIR. Besides, the dispersant was applied in Shenfu coal slurry. Through examining properties of the coal slurry, the effects of amount of cationic monomer DMC, the concentration of initiator and reaction temperature on dispersant performance were discussed. The result shows that the viscosity reducing of amphoteric polycarboxylic dispersant is better than the dispersant in stock which hasn’t cationic monomer when the dosage of DMC is 5.0wt%. It has been proved that the amphoteric polycarboxylic dispersion agent is suitable for Shenfu coal slurry. When the dosage of AmPC dispersant is up to 0.5wt%, the highest concentration of coal-slurry can reach 65.4wt%.

High-concentration coal–water slurry from Indian coals using newly developed additives

2004 ◽  
Vol 85 (1) ◽  
pp. 31-42 ◽  
Author(s):  
Kaushal K Tiwari ◽  
Sibendra K Basu ◽  
Kumaresh C Bit ◽  
Somnath Banerjee ◽  
Kamlesh K Mishra
Keyword(s):  
High Concentration ◽  
Water Slurry ◽  
Coal Water Slurry ◽  
Indian Coals

Preparation of high concentration coal water slurry of lignite based on surface modification using the second fluid and the second particle

Fuel ◽  
2019 ◽  
Vol 242 ◽  
pp. 788-793 ◽  
Author(s):  
Xing Chen ◽  
Chunyu Wang ◽  
Ziyu Wang ◽  
Hui Zhao ◽  
Haifeng Liu
Keyword(s):  
Surface Modification ◽  
High Concentration ◽  
Water Slurry ◽  
Coal Water Slurry
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