Unconventional pollutant removal from a coal-fired ultra-low emission unit
Notice bibliographique
Résumé
The emission of unconventional pollutants from coal-fired power plants has not received enough attention. In order to fully characterize the removal characteristics of unconventional pollutants from coal-fired power plants, the step removal characteristics of CPM, Hg, SO3, PAHs and other abnormal pollutant from a 1 000 MW coal-fired ultra-low emission unit were systematically studied by using FPM and CPM integration sampling system, Ontario method (OHM), controlling condensate method, HJ 646-2013 unit test method. The results showed that at 100% and 75% loadings, the removal efficiencies of CPM were 87.15% and 92.20% by the low-low-temperature electric dust removal system, respectively, and wet desulfurization efficiencies were 49.65% and 45.55%, respectively. At different loadings, FPM emission concentrations were 3.6 and 4.4 mg·m−3, respectively, but CPM emission concentrations were 14.2 and 15.3 mg·m−3, the latter ones were much higher than the former ones. The Hg removal efficiency of low-low-temperature electric dust removal system was 64.81%, and the Hg removal efficiency of the whole system was 75.5%. Hgp was totally removed, and the remaining ones were Hg0 and Hg2+ being hard to remove, their removal efficiencies were 63.01% and 64.29%, respectively. The emission concentrations of Hg0 and Hg2+ were 5.4 μg·m−3 and 0.5 μg·m−3, respectively. The conversion rate of SO2 oxidized to SO3 by SCR denitration catalyst was about 0.7%. The low-low-temperature electric dust removal system could remove 88.7% SO3 in the gaseous state, the wet desulfurization could remove 29.63% SO3, the final SO3 emission concentration was 1.9 mg·m−3. The removal efficiency of 16 kinds of PAHs from the whole system reached 94.25%, of which the removal efficiencies of gas and solid phase PAHs were 91.61% and 99.27%, respectively, their corresponding emission concentrations were 2.39 and 0.11 μg·m−3, respectively. The existing ultra-low emission equipment had different levels of collaborative removal effect of unconventional pollutants, the emission concentrations of CPM, Hg, SO3 and PAHs of the unit at full loading were 14.2 mg·m−3, 5.9 μg·m−3, 1.9 mg·m−3 and 2.5 μg·m−3, respectively. The Hg emission concentration meets the standard of 30 μg·m−3 in Emission Standard for air pollutants from thermal power plants, and the national compulsory emission standard for the emission concentrations of CPM, Hg, SO3 and PAH have not yet settled. This study can provide a reference for the control of unconventional pollutants in coal-fired power plants.
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Comment cette classification a été obtenuedéplier
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) | 0,001 | 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.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».