| Since the disposal capacity for hazardous waste can not meet the demands in China, the research and development of new hazardous waste disposal technology has been encouraged by the state. The boiler and industrial furnaces in China are of various types, in large quantities and wide distribution. The high temperature in boiler and industrial furnaces has advantages in the hazardous waste incineration. Co-disposal of hazardous waste with ideal calorific value in boiler and industrial furnaces will not only help in the disposal of hazardous waste, but also reduce the fuel concumption. In this paper, two typical type of pharmaceutical industry hazardous waste: bio-ferment residual and chemical synthesis residual are studied for hazardous waste co-disposal in boiler and industrial furnaces.There is not yet an economically viable disposal technology for bio-ferment residual; hence, co-disposal of bio-ferment residual is studied in a multi-component coal water slurry pressurized gasifier. The fuel characteristics of bio-ferment residual were tested by proximate and ultimate analysis, thermogravimetry analysis, and thermal kinetic analysis. It was found that bio-ferment residual has low ash content, low fixed carbon content, and a considerable calorific value. It is mainly composed of more volatile and more flammable volatiles. According to co-combustion tests on bio-ferment residual and coal, the mixing ratio of bio-ferment residual and coal is the most important factor in the amount of the residue and pollutants emission. In the bio-ferment residual co-disposal test conducted on the coal water slurry pressurized gasifier, it was found that adding bio-ferment residual properly has little effect on the production, the operation and the pollutants emission. Hence, it is considered that the multi-component coal water slurry pressurized gasifier is suitable for the co-disposal of bio-ferment residual.Chemical synthesis residual is generated in large amounts and has high treatment cost. The co-disoposal of chemical synthesis residual is studied in a 10 t/h coal-fired chain grate furnace. According to the proximate and ultimate analysis, thermogravimetry analysis, and thermal kinetic analysis, the chemical synthesis residual has low ash and fixed carbon content, with a high calorific value, and is mainly composed of more volatile but hard igniting volatiles. The chemical synthesis residual is sent for particle size distribution, flow characteristics, corrosivity, atomization characteristics, ash composition characteristics and differential scanning calorimetry analysis. According to the thermal characteristics of chain grate furnace, methods and technical route for chemical synthesis residual co-disposal in the chain grate furnace were proposed. The co-disposal of chemical synthesis residual in the chain grate furnace was simulated using the method of numerical computation. It was found that the temperature in the chain grate furnace is in range of 850-1100℃, and the residence time of waste particle is more than 2 seconds. Adding chemical synthesis residual properly has little effect on the flow field, temperature field and gas component distribution in the chain grate furnace. Hence, it is considered that the chain grate furnace is suitable for the co-disposal of the chemical synthesis residual. |
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