State Key Laboratory of Coal Conversion

Taiyuan, China

State Key Laboratory of Coal Conversion

Taiyuan, China
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Chang H.,Taiyuan University of Technology | Li X.,Taiyuan University of Technology | Liu L.,Taiyuan University of Technology | Li Y.,Taiyuan University of Technology | Wei W.,State Key Laboratory of Coal Conversion
Science and Technology of Energetic Materials | Year: 2013

The coal tar pitch powder, whose size less than 200 mesh, was prepared by cryogenic grinding technology with the high temperature coal tar pitch. The coal tar pitch was frozen at the friability temperature and then grinded with some dispersants in. The pitch powder was screened to achieve particles with size less than 200 mesh. The sodium fatty alcohol ether sulfate (AES) was the best dispersant after election. The effects of preservation time, temperature and dispersants on the stability of coal tar pitch powder were studied.


Chang H.H.,Taiyuan University of Technology | Liu L.F.,Taiyuan University of Technology | Li X.,Taiyuan University of Technology | Li Y.W.,Taiyuan University of Technology | And 2 more authors.
Indian Journal of Chemical Technology | Year: 2015

The coal pitch water slurry(CPWS) has been prepared with solutions of dispersants and medium temperature coal tar pitch powder corresponded with “bipeak trifurcated distribution” made by cryogenic grinding technology. The influences of HDBAC and Octadearyl dimethyl ammonium chloride on slurry ability, rheological behavior and stability of the CPWS have been investigated. Moreover, wetting, adsorption and the Zeta potential of aqueous solutions of dispersants on coal tar pitch's surface have also been discussed. The results show that HDBAC and STAC are both suitable to prepare the CPWS, and HDBAC is the better one. Apparent viscosity of the CPWS increases with the growing of slurry concentration when surfactant dosage remain unchanged, and the slurry concentration of CPWS prepared by HDBAC and STAC can reach 70% at most. The apparent viscosity declines when shear rate grows, so apparently, the CPWS is a pseudo plastic liquid and has a better rheological behavior. The stability becomes weaker with the passage of time. The adsorption of dispersants and Zeta potential on coal tar pitch increase with the growing of solution concentration. The contact angle of solution on coal tar pitch surface declines when dispersants added, which is helpful to build a stable diverse system. © 2015, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved.


Yan Q.,Shanxi Institute of Coal CAS Chemistry | Yan Q.,University of Chinese Academy of Sciences | Yan Q.,State Key Laboratory of Coal Conversion | Huang J.,Shanxi Institute of Coal CAS Chemistry | And 5 more authors.
30th Annual International Pittsburgh Coal Conference 2013, PCC 2013 | Year: 2013

The kinetics of three different ranks of typical Chinese coal chars gasification with steam was investigated at higher pressure (up to 2.0 MPa) in a pressurized fixed bed differential (PFBD) reactor. The results show that the global nth-order rate equation including the only item of steam partial pressure is not appropriate for the gasification in which the total system pressure changes. Thus, in this work, a modified nth-order rate equation was proposed, to be applied for three types of coal-chars including the independent variables (T, yH2O, Ptotal). It is indicated that the effect of steam molar fraction gasification rate is greater than that of the total system pressure. For the three types of coal-chars, the correlation exponent with respect to steam molar fraction decreases with the increase of carbon conversion; however, the carbon conversion has little influence on the correlation exponent with respect to the total system pressure. In addition, as the coal rank increases, the correlation exponent with respect to steam molar fraction and the correlation exponent with the total system pressure increase slightly.


Li F.,Heze University | Li F.,State Key Laboratory of Coal Conversion | Yan Q.,Shanxi Institute of Coal CAS Chemistry | Yan Q.,State Key Laboratory of Coal Conversion | And 7 more authors.
Fuel Processing Technology | Year: 2015

Gasification characteristics of lignite-char with steam, CO2 and their mixture in a pressurized fixed bed (PFB) reactor were investigated at different pressures (0.10 ~ 2.0 MPa, N2 as dilute gas). The results show that char-gasification mechanism in the mixture of steam and CO2 are connected with relative partial pressures of two reactant gases. A turning value of steam partial pressure is found in char gasification, when the steam partial pressure is lower than the value, the char gasification rate firstly increase and then drops with CO2 partial pressure increase; whereas, when the steam partial pressure is higher than the value, the increase of CO2 partial pressure results in char gasification rate decrease. The reaction mechanism of lignite-char gasification in the mixture of steam and CO2 is closely related to the total pressure: under lower pressures, it is consistent with the separate reactive site reaction mechanism; while under higher pressures, it approaches to the common reactive site reaction mechanism. © 2015 Elsevier B.V.


Li F.,Heze University | Li F.,State Key Laboratory of Coal Conversion | Yan Q.,Shanxi Institute of Coal CAS Chemistry | Yan Q.,State Key Laboratory of Coal Conversion | And 7 more authors.
Fuel Processing Technology | Year: 2015

Gasification characteristics of lignite-char with steam, CO2 and their mixture in a pressurized fixed bed (PFB) reactor were investigated at different pressures (0.10~2.0MPa, N2 as dilute gas). The results show that char-gasification mechanism in the mixture of steam and CO2 are connected with relative partial pressures of two reactant gases. A turning value of steam partial pressure is found in char gasification, when the steam partial pressure is lower than the value, the char gasification rate firstly increase and then drops with CO2 partial pressure increase; whereas, when the steam partial pressure is higher than the value, the increase of CO2 partial pressure results in char gasification rate decrease. The reaction mechanism of lignite-char gasification in the mixture of steam and CO2 is closely related to the total pressure: under lower pressures, it is consistent with the separate reactive site reaction mechanism; while under higher pressures, it approaches to the common reactive site reaction mechanism. © 2015.

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