冬季牛舍中三种吸附剂对NH_3、CO_2和H_2S的吸附

Study on the Adsorption Capacity of Three Kinds of Adsorbent NH_3,CO_2 and H_2S in the Cowshed in Winter

【目的】选用三种不同孔径分子筛吸附剂对冬季奶牛圈舍中CO2、NH3和H2S吸附试验。【方法】用便携式气体检测仪检测排风扇口排出的CO2、NH3和H2S浓度,悬挂吸附剂的为试验组,不悬挂吸附剂的为对照组。两者之差即为吸附剂XF-1、XF-2、XF-3的吸附浓度,根据实际测得的气温、气压、风速,利用理想气体状态方程推导出公式,将mg/kg换算为mg/m3。当试验组与对照组浓度无差异性时停止试验。【结果】1 kg XF-1吸附剂可吸附CO270.91 g、NH32.29 g、H2S 1.57 g;1 kg XF-2吸附剂可吸附CO275.49 g、NH32.65g、H2S 1.65 g;1kg XF-3吸附剂可吸附CO285.95 g、NH32.87 g、H2S 1.88 g。【结论】三种吸附剂对CO2、NH3和H2S气体的吸附量与圈舍内相应气体浓度正相关性显著(P<0.05),与温湿度负相关性不显著(P>0.05)。吸附剂的吸附能力与总孔体积、比表面积成正比,吸附剂XF-3对气体吸附能力最强,吸附剂XF-1最弱。三种吸附剂在1~3 h吸附效果最好,此后缓慢下降,吸附剂XF-1悬挂30 h需要更换,吸附剂XF-2悬挂27 h需要更换,吸附剂XF-3悬挂25 h需要更换。

【Objective】This experiment aims to test the adsorption capacity to CO2,NH3 and H2S of three different aperture molecular adsorbent in the cowshed in Winter.【Method】The portable gas detector was used to test the concentrations of CO2,NH3 and H2S at the ventilator,the suspension adsorbent was taken as the experimental group,and no adsorbent was the control group. The different values between the two groups were the adsorption concentration of XF- 1,XF- 2 and XF- 3. The ideal gas state equation was applied to deduce formula according to the actual measured temperature,atmospheric pressure and wind speed,ppm was converted to mg / m3,Stop the test when there was no obvious different between the experimental group and the control group.,【Result】The experimental data showed that 1 kg of XF- 1 adsorbent couild adsorb CO270. 91 g,NH32. 29 g and H2 S 1. 57 g; 1 kg of XF- 2 adsorbent could adsorb CO275. 49 g,NH32. 65 g and H2S1. 65 g; 1 kg of XF- 3 adsorbent could adsorb CO285. 95 g,NH32. 87 g and H2 S 1. 88 g; 【Conclusion】The adsorption of three kinds of adsorbent adsorption to CO2,NH3 and H2S had positive correlation with the gas concentration in cowshed and showed no obvious negative correlation with the relative humidity. Adsorbent adsorption capacity was proportional to the total pore volume,specific surface area. The adsorption capacity of adsorbent XF- 3 was the best,and the Adsorbent XF- 1 the weakest. The best adsorbent time of three kinds of adsorbent adsorption was 1 ~ 3 h,and then they dropped slowly; The adsorbent XF- 2 should be replaced after suspension for 30 h; The adsorbent XF- 2 should be replaced after suspension for 27 h. The a Adsorbent XF- 3 should be replaced after suspension for 25 h.