机械通风猪舍卧式末端废气净化系统除氨效率试验研究

Experimental study on ammonia removal efficiency of horizontal end exhaust gas purification system for mechanically ventilated pig houses

为提高猪舍规模化养殖中废气净化的效率,针对机械通风猪舍中采用酸洗喷淋法的卧式废气净化系统开展试验研究。通过结合正交试验方案,利用极差分析与方差分析方法,研究在采用酸洗喷淋法的卧式废气净化系统中通风速度,酸洗泵频率、喷淋方向关键工艺参数对除氨效率的影响规律。试验结果表明:喷淋方向对除氨效率有显著影响,且在错流喷淋方向上效率最高,平均除氨效率比顺流方向效率高6.87%,比逆流方向效率高18.88%。通风风速的降低能提高除氨效率,在保证足够的酸洗泵压力时,酸洗泵压力的提高对除氨效率影响不大。通过极差分析,方差分析得出卧式废气净化系统中喷淋方向为错流,酸洗泵频率为30 Hz,通风风速为1 m/s的除氨效果理论上最好。最后根据其各组合除氨效率以及耗电量,列举出较优方案为产品化设计提供参考。

In order to improve the efficiency of waste gas purification in large-scale pig farming,this paper studied the horizontal exhaust gas purification system using the acid spray scrubbing method in mechanically ventilated pig houses.Combined with the orthogonal test plan and using the range analysis and variance analysis methods,this paper analyzed the influence mechanism of key process parameters such as the ventilation speed,the frequency of the pickling pump,and the spray direction in the acid spray scrubbing method on the efficiency of ammonia removal.The test results showed that the spray direction has a significant effect on the ammonia removal efficiency.The average ammonia removal efficiency was 6.87% higher than the downstream efficiency and 18.88% higher than the counter-current efficiency.The reduction of the ventilation wind speed can improve the ammonia removal efficiency.When ensuring sufficient acid cleaning pump pressure,the increase of the acid cleaning pump pressure had little effect on the ammonia removal efficiency.Through range analysis and variance analysis,it can be concluded that in horizontal exhaust gas purification system,the spraying direction was cross-flow,picking frequency was 30 Hz,and ventilation wind speed was 1 m/s,the ammonia removal effect was theovetically the best.Finally,according to the ammonia removal efficiency and power consumption of each combination,the optimal scheme was listed to provide reference for product design.