Sludge Drying System with Molten Salt Heat Recovery
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Solution Overview
Problem
Existing sludge drying processes are energy-inefficient and result in significant environmental pollution due to high heat consumption and inadequate waste heat utilization, as well as incomplete separation of toxic gases.
Innovation Solution
An energy-saving sludge drying system incorporating a vacuum heating unit, incinerating unit, vacuum cooling unit, and molten salt heat exchanging unit, which utilizes waste heat to preheat combustion gas, separates organic waste gases for burning, and recycles heat to dry sludge at low temperatures in a vacuum state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct contact drying with hot air is used, then drying speed is improved, but heat energy loss increases and environmental pollution occurs
Solution Approach 1:
The patent recovers waste heat from exhaust gases and condensing vapor, using it to preheat fresh air and heating water for sludge drying. This transforms previously discarded heat energy into a useful resource, significantly reducing the energy loss associated with direct contact drying while maintaining high drying speed.
Solution Approach 2:
The system implements a feedback mechanism where exhaust gas temperature and vapor condensation are continuously monitored, and the recovered heat is dynamically adjusted to optimize preheating and drying processes. This ensures energy efficiency is maintained while preserving high productivity.
2Use of energy by moving object
If waste heat is not utilized, then system complexity is reduced, but energy consumption increases
Solution Approach 1:
The patent merges multiple functions into integrated components: the exhaust gas heat exchanger combines cooling of exhaust gases with heating of fresh air; the vapor condenser simultaneously condenses vapor and recovers heat; the heating water system integrates with both the heat exchanger and drying bed. This merging reduces overall system complexity while achieving significant energy savings through waste heat utilization.
3Object-affected harmful factors
If evaporated vapor is discharged to atmosphere, then drying process is simplified, but environmental pollution increases
Solution Approach 1:
The patent converts the harmful evaporated vapor and hot exhaust gases into beneficial resources. The vapor is condensed to recover pure water and release heat energy; the hot exhaust gases are used for preheating air and heating water. This transformation eliminates air pollution while the released heat energy contributes to the drying process, reducing overall energy consumption.
4Productivity
If preheater and drying bed require large amount of external heat, then drying effectiveness is improved, but energy efficiency deteriorates
Solution Approach 1:
The patent implements preliminary heating actions through multiple stages: fresh air is preheated by exhaust gases before entering the drying bed; heating water is preheated by both exhaust gases and vapor condensation before being supplied to the drying bed. These preliminary actions reduce the amount of external heat required during the actual drying process, maintaining drying effectiveness while improving energy efficiency.
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 system effectively reduces energy consumption and waste gas emissions, ensures complete decomposition and purification of sludge gases, and achieves self-sufficient energy supply by recycling heat, making the process more energy-efficient and environmentally friendly.
Implementation Method 1
a vacuum heating unit... recycles heat to dry sludge at low temperatures
Implementation Method 2
a vacuum cooling unit... separates organic waste gases for burning
Implementation Method 3
an incinerating unit... ensures complete decomposition and purification of sludge gases
Implementation Method 4
separates organic waste gases for burning
Implementation Method 5
a molten salt heat exchanging unit... utilizes waste heat to preheat combustion gas
Implementation Method 6
achieves self-sufficient energy supply by recycling heat
Data Source
AI summary
An energy-saving sludge drying disposal system is provided. The disposal system includes a vacuum heating unit, an incinerating unit, a vacuum cooling unit and a molten salt heat exchanging unit. The vacuum cooling unit includes a high-temperature gas inlet, a condensed water outlet, a low-temperature gas outlet, a low-temperature liquid inlet and a medium-temperature liquid outlet. The high-temperature gas inlet of the vacuum cooling unit is connected with the vacuum heating unit. The incinerating unit includes an incinerator, an incineration gas inlet, a combustion-supporting gas inlet, a flue gas discharge outlet, a cold molten salt inlet and a hot molten salt outlet. The incineration gas inlet is connected with the low-temperature gas outlet of the vacuum cooling unit. The molten salt heat exchanging unit includes a cold molten salt outlet, a hot molten salt inlet, a medium-temperature liquid inlet and a high-temperature liquid outlet.