The release characteristics of CH_(4),H_(2),CO and CO_(2) from iron coke hot briquette(ICHB)during carbonization were studied.The results show that compared with briquette without iron ore,Fe_(3)O_(4) can inhibit the ...The release characteristics of CH_(4),H_(2),CO and CO_(2) from iron coke hot briquette(ICHB)during carbonization were studied.The results show that compared with briquette without iron ore,Fe_(3)O_(4) can inhibit the release rate of H2 and promote the production of CO and CO_(2).In addition,when the heating rate increases from 3 to 7℃/min,the release rates of CH4 and H2 increase,while the release rates of CO and CO_(2) first increase and then decrease.The carbonization process of ICHB was segmented,and corresponding kinetic analysis was carried out.The results show that the activation energy of StageⅡand StageⅣis higher in the carbonization process of ICHB,and the active pyrolysis of coal and the reduction of iron ore occur in these two stages.In addition,the effect of heating rate on the kinetic parameters of ICHB carbonization process was investigated.It was found that when the heating rate increased,the reaction activation energy of StageⅣdecreased first and then increased,which was consistent with the release law of CO and CO_(2).The analysis showed that the increase in heating rate leads to more reactions at higher temperatures,resulting in an increase in the release rate of some gases.In addition,thermal hysteresis can also cause some processes to fail to fully react at the end of heating.It is also found that the apparent activation energy and preexponential factor have kinetic compensation effect during the car-bonization of ICHB.展开更多
为实现土墙日光温室结构优化及温室土墙体轻简化,以泰安市不同厚度土墙日光温室为研究对象,利用在两温室(1号墙体较厚、2号墙体较薄)北墙体的不同高度上布置的温度传感器采集的数据,比较分析了在不同天气状况条件下两温室不同厚度土墙...为实现土墙日光温室结构优化及温室土墙体轻简化,以泰安市不同厚度土墙日光温室为研究对象,利用在两温室(1号墙体较厚、2号墙体较薄)北墙体的不同高度上布置的温度传感器采集的数据,比较分析了在不同天气状况条件下两温室不同厚度土墙体的蓄放热特性。结果表明,晴好天气时,1号温室土墙体的蓄热量和放热量略高于2号温室,二者差值很小,分别为82.3、45.0 k J。连阴天时墙体全天放热,测试3 d的平均放热量,1号温室明显高于2号温室,厚墙体与薄墙体的放热量有明显差异,其二者差值为615.9 k J,但两温室距离墙体内表面0.1 m处的平均气温相差仅0.6℃。从距墙体内表面0.6 m以外的墙体温度相对稳定部分的温度分析表明,厚墙体温室(1号温室)温度相对稳定层的范围较薄墙体温室的大,蓄积热量也较多,应采取有效的换热设备或材料,将厚墙体内温度相对稳定层蓄积的热量释放到温室内部,用于进一步提高温室气温,以充分发挥厚墙体的节能效果。展开更多
文摘The release characteristics of CH_(4),H_(2),CO and CO_(2) from iron coke hot briquette(ICHB)during carbonization were studied.The results show that compared with briquette without iron ore,Fe_(3)O_(4) can inhibit the release rate of H2 and promote the production of CO and CO_(2).In addition,when the heating rate increases from 3 to 7℃/min,the release rates of CH4 and H2 increase,while the release rates of CO and CO_(2) first increase and then decrease.The carbonization process of ICHB was segmented,and corresponding kinetic analysis was carried out.The results show that the activation energy of StageⅡand StageⅣis higher in the carbonization process of ICHB,and the active pyrolysis of coal and the reduction of iron ore occur in these two stages.In addition,the effect of heating rate on the kinetic parameters of ICHB carbonization process was investigated.It was found that when the heating rate increased,the reaction activation energy of StageⅣdecreased first and then increased,which was consistent with the release law of CO and CO_(2).The analysis showed that the increase in heating rate leads to more reactions at higher temperatures,resulting in an increase in the release rate of some gases.In addition,thermal hysteresis can also cause some processes to fail to fully react at the end of heating.It is also found that the apparent activation energy and preexponential factor have kinetic compensation effect during the car-bonization of ICHB.
文摘为实现土墙日光温室结构优化及温室土墙体轻简化,以泰安市不同厚度土墙日光温室为研究对象,利用在两温室(1号墙体较厚、2号墙体较薄)北墙体的不同高度上布置的温度传感器采集的数据,比较分析了在不同天气状况条件下两温室不同厚度土墙体的蓄放热特性。结果表明,晴好天气时,1号温室土墙体的蓄热量和放热量略高于2号温室,二者差值很小,分别为82.3、45.0 k J。连阴天时墙体全天放热,测试3 d的平均放热量,1号温室明显高于2号温室,厚墙体与薄墙体的放热量有明显差异,其二者差值为615.9 k J,但两温室距离墙体内表面0.1 m处的平均气温相差仅0.6℃。从距墙体内表面0.6 m以外的墙体温度相对稳定部分的温度分析表明,厚墙体温室(1号温室)温度相对稳定层的范围较薄墙体温室的大,蓄积热量也较多,应采取有效的换热设备或材料,将厚墙体内温度相对稳定层蓄积的热量释放到温室内部,用于进一步提高温室气温,以充分发挥厚墙体的节能效果。
