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In the underground coal gasification (UCG) process, a feasible method for the reduction of CO2 emissions is to capture the CO2 present in syngas and reinject it as one of the gasification agents, which is called CO2 recycling. In this process, CO2 partially replaces steam as a gasification agent, which is of particular importance in areas lacking sufficient water. To obtain a more accurate and generally...
NO reduction through advanced reburning (AR) was carried out in an entrained flow reactor. Four types of biomass fuels, rice husk (RH), camphor leaves (CL), saw dust (SD) and wood charcoal (WC), were selected as reburning fuels. Effects of reaction temperature in the reburning zone (T2), biomass species, water vapor and alkali metal additives (Na2CO3, NaOH, NaCl and KCl) on NO reduction were investigated...
Two types of polymer nanocomposite particles were developed through electroless plating of nickel onto polymer nanospheres for hydrogen production from sodium borohydride solution. Different distributions of Ni in the polymer particles can be obtained either in polymer core-metal shell morphology or homogeneously hybridized morphology, depending on the hydrophilicity of the polymers. The Ni–polymer...
The effects of coal types with a wide range of volatile matter content including lignite, bituminous coal, and lean coal, as well as the effects of reaction temperature, coal particle size, the primary-zone stoichiometry (SR1) and reburning-zone stoichiometry (SR2), etc. on NO reduction efficiency were carried out systematically in an entrained flow reactor. The heterogeneous NO reduction mechanism...
According to the properties of coal–water paste (CWP), a series of experimental nozzles were developed for a detailed study of the effect of nozzle design on CWPs behavior in a pressurized fluidized bed. The particle size and its distribution of atomized CWP using several types of nozzles are measured by PIV instrument and newly developed image processing software, and the effect of a number of factors...
On the basis of analyzing the mechanism of coal-water paste (CWP) slip flow, the similitude criterion, known as general Reynolds number Re g which can characterize the state of non-Newtonian fluid flow in pipes, was put forward. The energy loss coefficient of CWP laminar flow has the same form as Newtonian fluid, i.e. λ=64/Re g . Re g holds good not only for the slip flow of...
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