Experimental Study On Catalytic Gasification Of Coal By High Temperature Copper From

Solid heat carrier technology for requiring external heat coal pyrolysis and gasification, often used solid heat carrier sand, coal ash, semi coke as solid heat carrier, the method have some advantage:heating rapidly, heat carrier and gasification products easily separate, large production capacity, effectively avoid the shortcomings of traditional external heating type heat transfer is slow, small capacity and heat type consumption partial gasification resources (combustion of coal gasification) provide heat.The copper slag resource use and energy conversion as the basic starting point, combined with the waste heat utilization, catalysis, with coal as the raw material for gasification, the hot copper slag to iron tailings residue catalytic coal gasification process parameters, before and after the reaction tail slag morphology characteristics and technology of catalytic mechanism were studied.A self-built solid heat carrier catalytic gasification device as fixed bed is used to inferior coal gasification, copper slag remove iron tails as solid heat carrier and catalyst, CO2 as gasifying agent. The effects of the effects of temperature, particle size of coal and pyrolysis coke temperature change rate and coke making final temperature, gasifying agent, catalyst type conditions on the gasification process results.With the same gasification process conditions, hot copper slag removed iron tailings catalytic coal gasification thermal gravimetric analysis:the pyrolysis stage apparent activation energy 154.66kJ/mol, in the same circumstances, than the single coal pyrolysis apparent activation energy(175.92kJ/mol)reduced 12.09%; semi-coking gasification section apparent activation 15.08kJ/mol, compared single coal char gasification activation energy (17.22kJ/mol) reduce 12.39%, indicating that the tailings catalytic gasification of coal effect is remarkable.High temperature copper slag removal of iron tailings as heat carrier catalytic coal gasification with CO2 get the best technology:Reactor select fixed bed, with anthracite as the raw material for gasification, slag temperature is1200℃, coal particle size is 40 mesh, slag and coal blending quality is 1.8, N2 atmosphere, natural cold to 1000℃ insulation 20min completely coking coal and CO2 atmosphere (200ml/min),1000-700℃ for controlled cooling 70 min, the calorific value of gas production is highest(18.3 MJ/m3), belong to median gas.Catalytic coal gasification process to produce more cracks, holes, making coal and coke ratio surface area increases, promote the coal chars with CO2 gasification rate; The X-ray diffraction (XRD), scanning electron microscopy (SEM) of catalytic slag and coking mix content analysis:catalytic component is calcium aluminosilicate in slag, the catalytic activity is calcium aluminate silicon uniformly distributed on the char surface and crystal silicon alumina structure can form acid center ([SAO]H+), Formation behavior occurred in that Ca+ adsorpted fused ring, the acid center formed with silicon-. aluminum、oxygen atoms and hydrogen proton from " C " in Alkyl side chain, giving H+ accelerated fused ring side chain removal rate, accelerating coal gasification process.It presents a kind of combined waste heat utilization and catalytic with upgrading the low activity and inferior coal, the catalytic gasification can improve the waste heat utilization rate, disposable waste heat utilization and avoid recycling catalyst, It is significant for promoting the energy utilization of industrialization process.