Spray Drying Apparatus for Compact Desulfurization Wastewater Elimination
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Solution Overview
Problem
Large-sized air pollution control facilities require significant space and increased fuel consumption due to the need for large quantities of wastewater treatment and heat exchange, which complicates the elimination of desulfurization wastewater using existing spray drying systems.
Innovation Solution
Incorporating a filter to remove solid contents from the concentrated/dehydrated filtrate and a solid-gas separator in the flue gas supply line, reducing the volume of wastewater and optimizing the spray drying process to create a compact system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spray drying apparatus is used to completely evaporate and solidify dehydrated filtrate from desulfurization wastewater, then wastewater elimination is achieved, but the size of the spray drying apparatus body becomes larger in large-sized plant facilities
Solution Approach 1:
The patent applies preliminary action by introducing a concentration apparatus before the spray drying apparatus to pre-concentrate the dehydrated filtrate. This preliminary concentration step reduces the volume of wastewater that needs to be processed in the spray drying apparatus, thereby enabling compact design while still achieving complete evaporation and solidification of the concentrated liquid.
2Reliability
If a large quantity of wastewater is treated using spray drying, then wastewater elimination is achieved, but the heat exchange amount of the air heater is reduced and fuel consumption increases
Solution Approach 1:
The concentration apparatus performs preliminary action by pre-concentrating the dehydrated filtrate before it enters the spray drying apparatus. This reduces the total volume of wastewater requiring heat treatment, thereby decreasing the heat exchange burden on the air heater and reducing fuel consumption while maintaining effective wastewater elimination.
Solution Approach 2:
The patent applies parameter changes by altering the concentration parameter of the dehydrated filtrate through the concentration apparatus. By increasing the concentration level before spray drying, the system reduces the total energy required for evaporation while maintaining the effectiveness of wastewater elimination.
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 compact system reduces the size of the spray drying apparatus and minimizes fuel consumption by decreasing the amount of branch gas needed for evaporation, while maintaining effective wastewater elimination.
Implementation Method 1
a spray drying apparatus (50) that is configured to spray and gasify the dehydrated filtrate (33) using a branch gas (18a) from the flue gas (18) and to evaporate and solidify the sprayed dehydrated filtrate (33)
Implementation Method 2
a filter (60) that is configured to remove solid contents contained in the concentrated/dehydrated filtrate (33A) to be fed into the spray drying apparatus (50)
Implementation Method 3
the flue gas supply line (L12) is provided with a solid content separator (70) that is configured to perform a solid-gas separation on the solid contents (71) contained in the flue gas (18b)
Implementation Method 4
an air heater (13) that recovers heat of the flue gas (18) having passed through the denitration device (12)
Data Source
Figure 1
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Figure 3
AI summary
Provided is an air pollution control system including: a boiler 11 that is configured to combust a fuel F, a denitration apparatus 12 that is configured to remove nitrogen oxides in a flue gas 18 discharged from the boiler 11; an air heater 13 that is configured to recover heat of the flue gas 18 after denitration; a precipitator 14 that is configured to remove soot and dust contained in the flue gas 18 after heat recovery in the form of collected dust ash 16; a desulfurization apparatus 15 that is configured to remove sulfur oxides contained in the flue gas 18 after dust removal using limestone slurry 20 which is an absorbent; a dehydrator 32 that is configured to recover gypsum 31 from an absorbent 30 serving as desulfurized wastewater discharged from the desulfurization apparatus 15; a concentration apparatus 41 that is configured to remove some of water of dehydrated filtrate 33 from the dehydrator 32; a spray drying apparatus 50 provided with a spray unit that is configured to spray concentrated/dehydrated filtrate 33A concentrated by the concentration apparatus 41; and a flue gas introduction line L11 through which branch gas 18a branched from the flue gas 18 is introduced to the spray drying apparatus 50.