Desulfurization Wastewater Evaporation Technology: Field Test, Product Analysis and Potential Risk Assessment
Notice bibliographique
Résumé
Desulfurization wastewater evaporation technology is an effective approach to achieve zero liquid discharge.However, limited information on the practical engineering performance and the evaporation product properties was a lack of awareness.In this study, we conducted a field test of desulfurization wastewater evaporation technology in a demonstration project.The results indicated that the technology was highly feasible and applicable to operating conditions with varying desulfurization wastewater flow rates.Maintaining the low moisture content of the evaporation product was crucial for successfully implementing wastewater evaporation, and exceeding a certain threshold may lead to issues such as wall sticking and blockage of the conveying pipeline.The moisture content of the evaporation product for operation conditions Ⅰ, ⅠⅠ, and ⅠⅠⅠ were 1.2%, 0.9%, and 0.7%, respectively, which could meet the engineering standards.The migration characteristics of chloride were investigated, revealing that less than 3% of Cl was released into gaseous HCl.The concentrations of other typical pollutants, such as NOx and SO2, remained unchanged after treatment, indicating that the wastewater evaporation technology did not significantly affect the distribution of gaseous pollutants.For the influence of wastewater evaporation on comprehensive fly ash utilization, the chloride mass fraction in the final product was lower than 0.06%, indicating that it could meet strict regulations and would not affect comprehensive fly ash utilization.Moreover, the study found that the evaporation process promoted the agglomeration of particulate matter, as confirmed by larger particle sizes and XRD analysis.It may slightly promote the dust removal efficiency of the electrostatic precipitator due to the aggregation effect of fine particles and the enhanced specific resistance.In this study, the single droplet drying method and spray drying system revealed the evaporation characteristics and product properties.The wastewater droplet evaporation process could be divided into two periods: constant rate and falling rate in the evaporation process.Besides, a shell would form when the critical concentration was achieved on the droplet surface.Then, the inflation, rupture, and re-inflation stages would be involved in the history of shell evolution.The components of the evaporation product mainly consisted of MgCl2, CaCl2, NaCl, and CaSO4.The total operating cost of wastewater evaporation ranged from 25 to 30 yuan per ton of wastewater, primarily consisting of coal consumption for extracting flue gas.The data obtained in this work complements and verifies existing research on wastewater evaporation technology.However, some potential risks and existing challenges of wastewater evaporation technology must be assessed.When the chloride content of the fly ash had more stringent requirements, installing a small bypass dust collector after the evaporation drying tower could be considered.By this means, all evaporation products were collected separately, avoiding any impact on the downstream equipment.Besides, the collected evaporation product could be mixed with the boiler slag, used in bricks and other industries that did not limit the chloride content or require low requirements to avoid the negative impact of wastewater evaporation products on the comprehensive fly ash utilization.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
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