Foundation Study On Ammonia Removing And Dehumidifying From Nitro-phosphate Tail Gas By High Gravity Technology

The process of nitro-phosphate tail gas creation was introduced in this paper. Composition and characteristic of the tail gas were analyzed. The absorption efficiency of ammonia which reached emission standard was calculated. The state of vapor was analyzed by the chart of H-I. Diversified disposal methods were introduced.Based on the study of mass-transfer in higee, the mass-transfer model of ammonia absorption was established. Simulated experiment was carried out. The gas was composed of air and ammonia. The concentration of ammonia was 7960mg/m3. Experiment showed that this technology was effective. The correctness of mass-transfer model was confirmed by experimental data. Compared with data of reference, higee enhanced mass-transfer coefficient greatly. Higee has distinct superiority compared with traditional tower.Based on study of heat-transfer and dehumidify model, proper dehumidify model was chose. Simulated experiment was carried out. The humidity of simulated gas was 0.1782kgwater/kgdry. The result showed that higee was effective, but limit to the part of super-saturation. The correctness of choice was confirmed. Compared with the data of reference, higee had good heat-transfer performance.Based on simulated experiments, pilot scale experiment was carried out. Adopting higee as equipment, acid waste water as absorbent, optimal operational parameter was searched. Running effect and stability were reviewed. The effect was obviously. The technology had effect to NOX and fluoride which had obvious effect to ammonia and vapor. The technology could effectively lightened corruption and jam of equipment. Compared with academic effect, it was proved again that higee had excellent performance of mass-transfer and heat-transfer.Economic cost was calculated on industrialization scale. Benefit of ammonia's reclaim was also calculated. The data showed that nitro-phosphate tail gas reached emission standard. Ammonia was reclaimed which created economic benefit for plant. The technology is worth industrialization application.