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For sewage sludge contains a lot of organic matter and has high calorific value, which has laid the sludge recycle the potential value of the foundation, also decided to the possibility of a harmless and recycling of sewage sludge. Calorific value contribution is the basic condition of sewage sludge, sludge moisture content must be out of the sewage treatment plant of around 80% to below 30%, which means that sludge dewatering of sludge depth become the key technologies of urban sewage sludge can be recycling use, therefore, we should further research on sludge drying process.
The sludge contains a lot of organic matter in sludge in the process of drying part of the organic matter decomposition, will happen and the release of gases. Of sludge drying and release of gas determination results of simulation test shows that under the temperature below 200 ℃, sludge release of gas, besides the main water vapor and a small amount of hydrocarbons, they are usually in the atmosphere is not stable, it is easy to oxidation and decomposition. Due to the use of flue gas waste heat drying sludge need of smoke gas in 1.5 x 105 cubic meters per hour above, therefore, from a small quantity of sludge in the release harmful gases are fully diluted, releasing gas and the interaction between flue gas and sludge, finally through dedusting of degassing device processing, tail gas can fully satisfy the generated from the sludge drying.