Improving slurryability, rheology, and stability of slurry fuel from blending petroleum coke with lignite

Feng

et al. 2021

Geofluids

In the process of the slurry shield construction, the formation of the filter cake is the key to maintain the stability of the excavation face. In high-permeability formation, ordinary pure bentonite slurry is easy to pass through the formation void. Therefore, it is necessary to study the slurry permeability characteristics of the high-permeability sand layer. For the purpose of researching the permeability characteristics of slurry in sandy formation, this paper studies the influence of slurry viscosity on the formation of the filter cake in high-permeability formation under different pressure gradients by the slurry permeability test. The effect of additive particle size on the film-forming gain was studied by adding additives with different particle sizes into pure bentonite slurries with different viscosities. This paper presents a method to determine the optimum slurry viscosity and particle size for high-permeability formation so as to guide the slurry shield construction in high-permeability formation.

Section: Effect Of Coarse-grained Additives On Filter Cakesupporting

confidence: 88%

“…[8] and coarse-grained materials (vermiculite, sand, clay, quartz powder, sawdust, fiber, etc.) [8][9][10][11][12][13][14] to improve the slurry properties. When the slurry permeates the formation, it could reduce the formation permeability and form the membrane more quickly and efficiently.…”

Section: Introductionmentioning

confidence: 99%

Seepage Characteristics of Slurry with Particle Additives in the High-Permeability Sand Layer

Feng

et al. 2021

Geofluids

“…To improve rheological properties of the coal-water suspension, there are used additives, dispersants, such as surfactants and electrolytes (Lee et al 2007 ; Aktas and Woodburn 2000 ; Al-Amrousi et al 1996 ; Seshadri et al 2008 ; Verma et al 2006 ; Naik et al 2009 ; Mukherjee and Pisupati 2016 ; Mosa et al 2008 ; Pat. US4416666 1979 ; Shin and Shen 2006 ; Wu et al 2015 ; Zhang et al 2016 ; Ma et al 2013 ). The addition of waste glycerol which is a surfactant to CWS can improve the useable properties of the resulting mixtures and further increase their calorific value, which is beneficial for their later use as fuel.…”

Section: Introductionmentioning

confidence: 99%

Studies on CWL with glycerol for combustion process

Staroń

Kowalski

Staroń

et al. 2018

Environ Sci Pollut Res

Findings of more efficient energy recovery methods are focused on composite fuels consisting of coal, water, and waste materials. The use of such slurry fuels has enormous environmental benefits due to the potential for waste utilization and low emissions of harmful oxides to the atmosphere during the combustion process. In this study, we report the effect of waste glycerol on the rheological properties of coal-water fuel (CWS). The addition of glycerol to CWS increases the viscosity (from 45.5 to 184.2 mPa·s at a shear rate of 100 rpm) and density (from 1.08 to 1.11 g/cm3) of these suspensions. The utility of choice of the most favorable parameters is equal to 0.85 for both CWS and CWS with added glycerol. Due to the fact that CWS is dosed to heated chamber, its modification with glycerol results in easier nebulization into the combustion chamber, lowering of the solidification temperature and increasing the calorific value of the resulting fuel. During combustion of CWS with glycerol, the amount of SO2 and NOx emitted is reduced by half as compared to the emission of these gases during hard coal combustion.

“…Extensive studies on PCWS have been carried out. Wu et al verified that mixing petroleum coke with lignite in petroleum coke–lignite slurry combines their complementary strengths to make petroleum coke–lignite slurry useful for combustion and gasification. Wang et al mixed petrochemical sludge with petroleum coke to prepare petroleum coke–sludge slurry that can utilize the two main byproducts, and the slurry can satisfy the requirements of good fluidity and strong stability.…”

Section: Introductionmentioning

confidence: 99%

Slurry characteristics and mechanism analysis of petroleum coke–coal water slurry

Liu

Asia-Pacific J Chem Eng

et al. 2019

Petroleum coke-coal slurry (PCCS) was prepared by blending sub-bituminous coal with petroleum coke in different proportions. The rheology and stability of PCCS were studied, and the mechanism of dispersion and stability was analyzed. Results show that with the increase of the mass ratio of petroleum coke to Shenhua coal (α) in PCCS, the apparent viscosity of the slurry gradually increases, and the stability of the slurry decreases. Moreover, the contact angle also increases, indicating that the surface hydrophobicity was increased. When the α is 3:7, the fixed viscosity concentration of PCCS is above 60%, the fixed viscosity flow characteristic index is below 0.9, and the fixed segregation water rate is below 5%. Blending petroleum coke with Shenhua coal takes advantage of the complementary properties of the two materials and obtains PCCS with high concentration and improved stability.