Sludge Air-Drying Loop with Heat Recovery and Dehumidification
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Solution Overview
Problem
Current sludge drying methods face issues such as high energy consumption, frequent device failures, complex tail gas treatment, and safety hazards like dust explosions and fires.
Innovation Solution
An air-drying device comprising a dosing mechanism, air-drying mechanism, and dehumidifying and heating mechanism with energy recovery, which includes a dehumidifying cool exchanger, tail gas heat exchanger, air warmer, blower, and refrigeration compressor, forming a loop configuration to efficiently dry sludge with reduced energy use and improved safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If meddle or high temperature is used for drying, then drying efficiency is improved, but energy consumption increases
Solution Approach 1:
The patent changes the drying parameter from high temperature to low temperature (ambient temperature) drying, achieving energy savings while maintaining drying effectiveness through extended detention time and increased air contact surface area
Solution Approach 2:
The patent implements continuous air circulation and sludge drying process, where dried sludge is continuously discharged and fresh sludge is continuously fed, maintaining constant drying efficiency without requiring high temperature energy input
2Ease of manufacture
If conventional drying methods are used, then drying function is achieved, but device complexity and tail gas treatment complexity increase
Solution Approach 1:
The patent extracts and removes the complex tail gas treatment system from the drying process by using low temperature drying that does not generate harmful tail gases, simplifying the overall device configuration
Solution Approach 2:
The patent replaces expensive and complex high temperature drying equipment with simpler, lower-cost ambient temperature drying equipment, achieving cost savings while maintaining drying functionality
3Speed
If high temperature drying is used, then drying speed is improved, but safety hazards increase
Solution Approach 1:
The patent creates a safe drying environment by using ambient temperature air instead of high temperature air, eliminating the risk of dust explosions and fires while maintaining effective drying through prolonged air contact
Solution Approach 2:
The patent converts the slow drying speed at ambient temperature into an advantage by allowing sufficient detention time for complete drying without generating harmful conditions, turning what appears to be a disadvantage into a safety benefit
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
The device achieves stable operation with low energy consumption, reduced pollution, lower apparatus costs, and safer conditions by efficiently drying sludge into loose particles with adjustable water content, minimizing anaerobic odor and simplifying tail gas treatment.
Implementation Method 1
a dehumidifying cool exchanger... wherein there is a condensate discharging pipe at the lower part of the dehumidifying cool exchanger
Implementation Method 2
a tail gas heat exchanger... wherein the exhaust pipe on the top of the air-drying mechanism connects with the inlet manifold of the tail gas heat exchanger
Implementation Method 3
a dehumidifying heat exchanger... wherein the dehumidifying heat exchanger connects with the air warmer
Implementation Method 4
an air warmer... wherein the outlet of the air warmer connects with the air inlet of the air-drying mechanism
Implementation Method 5
a refrigeration compressor
Data Source
AI summary
An air-drying device for sludge comprises at least one air-drying mechanism, a dosing mechanism, and a dehumidifying and heating mechanism. There two air-drying mechanisms. The dosing mechanism connects with the beginning end of the first air-drying mechanism (5) whose terminal end communicates with the beginning end of the second air-drying mechanism (8), with a discharge port (21) is arranged above the communicating position. The terminal end of the second air-drying mechanism communicates with the beginning end of the first air-drying mechanism to form a loop configuration. The device has high efficiency and low energy consumption. The detention time of the sludge in the drying device is adjustable so that the water content of the discharging material is adjustable.