Sludge Treatment:
The process that sludge must undergo before final disposal.
“On the basis of conventional sludge reduction processes such as sludge thickening, conditioning and dehydration, appropriate sludge treatment technology routes are selected according to sludge disposal requirements and corresponding sludge quality standards.”
Disposal:
“Sludge disposal is the process by which the treated sludge is absorbed. The means of disposal include land use, landfills and the comprehensive use of construction materials.”
Advantages of multi-stage furnace pyrolysis:
• The utility model can realize the self-heat balance operation with high water content and low energy consumption.
Sludge pyrolysis can be operated in self-thermal equilibrium without the addition of auxiliary fuel. The self-thermal equilibrium sludge pyrolysis has been successfully operated in the Central Costa Sanitary District of Concord, California, USA. The sludge pyrolysis Sewage Treatment is a multi-stage furnace, the moisture content of the treated sludge is 76% , the caloric value of the dry base is 4997 kcal/kg, and the caloric value of the pyrolysis gas is 801 kcal/m3.
• Furnace temperature and atmosphere can be easily stratified control
Three basic operation modes of multi-hearth furnace pyrolysis:
1. 低温炭化模式
(Low Temperature Char，LTC)
2. 高温炭化模式
(High Temperature Char，HTC)
3. 焦炭燃烧模式
( Char Burning Ash，CBA)
| Solution mode | 低温炭化模式LTC (Low Temperature Char) | 高温炭化模式HTC (High Temperature Char) | 焦炭燃烧模式CBA ( Char Burning Ash) |
| A description of the pattern | Operating Temperature: 450OC ~ 720oC, decomposing and releasing most of the Volatile organic compound, the coke of solid product has the characteristics of adsorbing and fixing heavy metals. | Operating Temperature: above 875OC. The pyrolysis gas has higher calorific value, the coke of solid product has higher carbonization degree, and has the characteristics of activated carbon. | The Coke is produced in the middle section of the furnace body, and the coke is burnt out by the air in the lower section of the furnace body. |
• The solid product is separated from the gas product so that each can react.
• Small rotating parts, low power demand.
• Good air tightness, simple oxygen control operation.
• More flexible control of operating conditions (retention time)
• Particulate matter emissions are low.
• It's easy to be big.
• Durable, long life furnace body.
MHF pyrolysis process 2. (optimize energy-saving design) :
Operating cost estimation-optimization of energy saving design (example) :
Pyrolysis vs. incineration:
Comparison of types of pyrolysis furnaces:
