Sludge Drying Carrier Reduces Energy Consumption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sludge drying methods consume excessive energy due to high water content in sludge, leading to increased operation costs and equipment workload, and are not adaptable to local conditions, with issues like viscous sludge hindering heat and mass transfer and causing equipment damage.
Innovation Solution
A method involving a sludge drying process where dehydrated sludge with a water content of 51-69% is mixed with a sludge carrier having a water content of 1-10%, then repeatedly stirred and dried, using a carrier for drying sludge to reduce energy consumption and optimize heat transfer, with temperatures ranging from 70-200°C and air input temperatures of 150-450°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If dehydrated sludge with high water content (80-85%) is directly dried, then the drying process requires excessive energy consumption, but the sludge can be processed without additional pretreatment
Solution Approach 1:
The patent applies preliminary action by performing mechanical dehydration before drying to reduce water content from 80-85% to 60-65%. This preliminary dehydration step removes excess water that would otherwise require excessive energy to evaporate during drying, thereby resolving the energy consumption problem while maintaining a relatively simple overall process structure
Solution Approach 2:
The patent changes the water content parameter of sludge from 80-85% to 60-65% through mechanical dehydration before the drying process. This parameter change significantly reduces the energy required for evaporation while avoiding the need for complex pretreatment procedures, effectively resolving the contradiction between energy consumption and process complexity
2Ease of operation
If dehydrated sludge with water content of 60-80% is dried, then the sludge becomes viscous and difficult to scatter, but the drying process can proceed with standard equipment
Solution Approach 1:
The patent performs preliminary mechanical dehydration to reduce water content to 60-65%, which is below the critical 60% threshold where sludge becomes excessively viscous. This preliminary action prevents the sludge from entering the high-viscosity range, ensuring easy scattering and effective heat transfer during drying without requiring special equipment modifications
Solution Approach 2:
The patent controls the water content parameter at 60-65%, which is strategically below the 60% threshold where sludge viscosity dramatically increases. This parameter control ensures the sludge remains easy to scatter and scatter uniformly during drying, resolving the contradiction between ease of operation and heat transfer efficiency
3Productivity
If sludge is dehydrated by centrifugal dehydration with PAM addition, then dehydration efficiency increases, but sludge floc twists and locks water inside making it difficult to remove
Solution Approach 1:
The patent applies partial dehydration (60-65% water content) rather than attempting complete dehydration. This partial action approach avoids the problem of excessive PAM addition causing sludge floc twisting and water locking, while still achieving sufficient water removal to reduce energy consumption in the subsequent drying process
Solution Approach 2:
The patent optimizes the water content parameter to 60-65%, which balances dehydration efficiency with water removal ease. At this parameter level, sludge maintains good scattering properties and does not form twisted floc structures that lock water inside, effectively resolving the contradiction between productivity and energy loss
4Productivity
If sludge drying equipment workload increases due to high water content sludge, then more equipment capacity is required, but the initial sludge water content is high
Solution Approach 1:
The patent performs preliminary mechanical dehydration to reduce water content from 80-85% to 60-65% before sludge enters the drying equipment. This preliminary action significantly reduces the water evaporation burden on drying equipment, allowing standard capacity equipment to handle larger volumes of sludge effectively, thereby resolving the contradiction between productivity and equipment workload
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly reduces energy consumption and operation costs by forming fine granulated sludge, enhancing mass and heat transfer efficiency, and minimizing the water content of the final product, thereby decreasing the workload on sludge drying apparatus and investment costs.
Implementation Method 1
dehydrated sludge with a water content of 51-69% is mixed with a sludge carrier having a water content of 1-10%
Implementation Method 2
transport the mixed sludge to a drying apparatus for drying
Implementation Method 3
drying temperatures ranging from 70-200°C and air input temperatures of 150-450°C
Implementation Method 4
air input temperatures of 150-450°C
Data Source
AI summary
A method for drying sludge comprising the following steps: (a) Dry dehydrated sludge to obtain a carrier for drying sludge (6); (b) Transport the carrier for drying sludge (6) and dehydrated sludge to be dried (1) to a stirring and mixing apparatus (2) for stirring and mixing and thereby obtain mixed sludge; (c) Transport the mixed sludge (3) to a drying apparatus (4) for drying; (d) Repeat steps (b) and (c); characterized in that in said step (d) a portion of the mixed sludge (3) obtained from the stirring and mixing apparatus (2) which is in an amount determined by amount of sludge carrier (6) required for drying is extracted and transported to the drying apparatus (4) for drying and the rest of the mixed sludge is discharged as final product (7).