Sludge Heating via Scrubber Water Heat Exchange
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Solution Overview
Problem
The existing organic sludge treatment facilities face issues with increased hot water usage and quality deterioration due to direct contact with sludge, leading to inefficiencies in heat circulation and alkaline component usage.
Innovation Solution
The implementation of a smoke effluent treatment tower with separate cooling sections and a hot water supply system that uses second cooling water, cooled and desulfurized, to directly warm thickened and dewatered sludge, reducing insoluble solid content and unreacted alkaline components, thereby preventing sludge deterioration and minimizing hot water usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If hot water is directly supplied to thickened sludge and dewatered sludge to warm them, then the warming effect is immediate and efficient, but the hot water cannot be circulated and reused, significantly increasing hot water consumption
Solution Approach 1:
The patent introduces an indirect heating system where hot water serves as a heat medium rather than being directly mixed with sludge. The hot water circulates through heating coils or heat exchangers embedded in the thickening and dewatering devices, transferring thermal energy to the sludge without direct contact. This intermediary approach enables hot water to be reused and circulated multiple times, significantly reducing consumption while maintaining effective warming.
Solution Approach 2:
The system implements a closed-loop circulation system where hot water continuously circulates through the sludge treatment devices, transferring heat repeatedly. The heated hot water returns to the heating system to be reheated, creating a continuous cycle of heat transfer. This continuous circulation maximizes the utilization of thermal energy and reduces the need for fresh hot water input.
2Temperature
If scrubber wastewater is directly supplied as hot water to sludge, then hot water is provided for warming, but the wastewater contains insoluble solid content and unreacted alkaline component that deteriorate sludge quality
Solution Approach 1:
The patent uses clean hot water as an intermediary heat medium instead of directly using scrubber wastewater on sludge. The hot water circulates through heat exchangers to transfer thermal energy to the sludge without direct contact, preventing contamination. This separates the thermal function from the wastewater, allowing the sludge to receive heat without exposure to harmful substances.
Solution Approach 2:
The system separates the cooling function from the heating function. The scrubber wastewater is used solely for cooling combustion exhaust gas in the smoke effluent treatment tower, while a separate clean hot water system is used for heating sludge. This segmentation prevents the transfer of contaminants from the wastewater stream to the sludge stream, maintaining sludge quality while achieving both cooling and heating objectives.
3Temperature
If scrubber wastewater is directly supplied to sludge for warming, then hot water is available, but the unreacted alkaline component cannot be circulated and used, increasing alkaline component consumption
Solution Approach 1:
The system divides the water treatment process into separate functional streams: one stream for acid gas treatment using alkaline components in the scrubber, and another clean hot water stream for sludge heating. The alkaline component is confined to the smoke effluent treatment tower where it neutralizes acid gases, while the clean hot water circulates independently for thermal processing of sludge. This segmentation prevents the mixing of alkaline wastewater with sludge and allows for more efficient resource utilization.
Solution Approach 2:
The patent introduces clean hot water as an intermediary heat medium that performs the warming function without containing unreacted alkaline components. This intermediary substance transfers thermal energy to the sludge through indirect heating systems, eliminating the need to use alkaline wastewater for heating purposes and thereby reducing alkaline component consumption and waste generation.
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 approach reduces the amount of hot water needed, prevents sludge deterioration, and minimizes the usage of alkaline components, enhancing the efficiency and sustainability of the organic sludge treatment process.
Implementation Method 1
a first cooling section that supplies first cooling water to the combustion exhaust gas to cool and desulfurize the combustion exhaust gas
Implementation Method 2
desulfurize the combustion exhaust gas
Implementation Method 3
a second cooling section that supplies second cooling water to the combustion exhaust gas cooled and desulfurized by the first cooling section to cool the combustion exhaust gas
Implementation Method 4
supply, as hot water, the second cooling water by which the combustion exhaust gas is cooled in the second cooling section to at least one of the thickening device and the dewatering device so that the hot water supplied to the thickening device and/or the dewatering device is mixed with the organic sludge to directly warm the organic sludge
Implementation Method 5
the hot water supplied to the thickening device and/or the dewatering device is mixed with the organic sludge
Implementation Method 6
an organic sludge treatment facility including a thickening device that thickens organic sludge coagulated by adding a coagulant to sewage sludge
Implementation Method 7
thickening device that thickens organic sludge
Implementation Method 8
a dewatering device that dewaters the organic sludge thickened by the thickening device
Implementation Method 9
an incinerator that incinerates the organic sludge dewatered by the dewatering device
Data Source
Figure 1
Figure 2
AI summary
An organic sludge treatment facility of the present invention includes a thickening device (1), a dewatering device (2), an incinerator (3), and a smoke effluent treatment tower (12), in which the smoke effluent treatment tower (12) includes a first cooling section (12A) that supplies first cooling water (H1) to the combustion exhaust gas (E) to cool and desulfurize the combustion exhaust gas (E) at a lower portion in the tower, and a second cooling section (12B) that supplies second cooling water (H2) to the combustion exhaust gas (E) cooled and desulfurized by the first cooling section (12A) to cool the combustion exhaust gas (E) at an upper portion in the tower, and in which hot water supply means is provided for directly warming the organic sludge by supplying, as hot water (I), the second cooling water (H2) by which the combustion exhaust gas (E) is cooled in the second cooling section (12B) to at least one of the thickening device (1) and the dewatering device (2).