Experimental Study Of Calcium-based Absorber Removing HCl In High-temperature Steam Gasification Gas

:In this article, the harmfulness of medical waste and its treatment technology was summarized, and the purification process of different harmful medical waste high-temperature pyrolysis gasification gas were introduced. In the experimental research, the removal of the danger gas of HCl were analyzed. The two steps was adopted in the experimental. The first step, the calcium-based sorbent was used for removal of a single gas source experiment, namely when the HCl single acid gas presenced, the calcium-based sorbent could be used to remove HCl. The effect of different factors on removal HCl experimental were determined, such as the concentration of HCl, the particle size of the calcium-based sorbent, the absorbent base layer, the reaction temperature, the water vapor content and the other factors affect of the calcium-based sorbent removal HCl, the optimal combination were obtained. The second step, the calcium-based sorbent was used removal of composite gas source experimental, namely CO2and HCl existed in the gas together, the same calcium-based absorbent was used for the removal of CO2and HCl gas experiment, to verify the presenced of CO2, the CO2gas affect of properties the calcium-based sorbent removal HCl. The best dechlorination factors were obtained by the experiments, it have guiding significance for purification of medical waste pyrolysis fuel gas.In this experiment, CaO absorbent was used. The conclusion of single factor experiments was concluded as follows,(1) CaO of a small particle diameter was beneficial to the removal of HCl. The dechlorination rate can be more than95%and meet production needs, when CaO particle diameter range was5-10(mm).(2) Theoretically, the dechlorination rate increase as CaO absorber arrangement layers add, but when the absorber arrangement layers was up to3, the dechlorination rate did not change significantly, so the reasonable CaO absorbent arrangement layers result was3.(3) The experiment tests showed that the dechlorination rate decreased as HCl concentration increased, its the dechlorination rate can be increased to95%, when HCl concentration range was3%-5%.(4) The experiment tests showed that the dechlorination rate increased as reaction temperature increased, the dechlorination rate can be more than98%, when the reaction temperature reached500℃, this just in a same temperature of high-temperature steam gasification gas, when the reaction temperature was up to650℃, the dechlorination rate did not change significantly.(5) the optimum combination A3B1C1D1from complex experiment, namely the calcium-based sorbent layers arranged in four layers, HCl concentration proportion of5%, the reaction temperature of500℃, the calcium-based sorbent particle size of5mm. For CaO removal composite gas source experiments, the conclusion was as follows, under the conditions of the actual gasification gas composition ranges (CO2content of20%, water vapor content in the range of40%-50%, HCl concentration of5%), when the various factors was used optimal combination value, the dechlorination rate can reach more than95%, it can meet the needs of the gasification gas purification.