节能的燃煤电厂烟气脱硫系统
By recovering heat from gypsum slurry and using it for preheating limestone slurry, the problem of heat energy waste in gypsum slurry is solved, heat recycling and slurry stability are improved, and energy consumption and carbon emissions are reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGXIA FENGYE ENVIRONMENTAL PROTECTION TECH CO LTD
- Filing Date
- 2025-08-05
- Publication Date
- 2026-07-17
AI Technical Summary
In the existing technology, the gypsum slurry does not undergo heat recovery before dewatering, resulting in heat energy waste and increasing the operating load of the dewatering system.
A heat exchange device is used to recover the heat from the gypsum slurry and use it to preheat the limestone slurry preparation, forming a stable limestone slurry that can be recycled as a desulfurizing agent.
It achieves heat recovery and utilization, reduces energy consumption and carbon emissions, improves slurry stability, reduces the use of additional energy, and achieves energy-saving effects.
Smart Images
Figure CN224506738U_ABST
Abstract
Claims
1. An energy efficient flue gas desulphurization system for coal fired power plants, characterized in that, The system includes a washing system, a heat exchange device, and a slurry mixing system. The heat exchange device has a cooling water inlet and a hot water outlet. The slurry outlet of the washing system is connected to the feed pipe of the heat exchange device. The hot water outlet is connected to the inlet of the slurry mixing system. The slurry mixing system also has an alkali inlet. The outlet of the slurry mixing system is connected to the inlet of the washing system, and the slurry prepared by the slurry mixing system is transported to the washing system.
2. The energy efficient coal-fired power plant flue gas desulphurization system as claimed in claim 1, wherein, The slurry mixing system includes an alkali raw material silo and a slurry mixer. The outlet of the alkali raw material silo is connected to the alkali inlet of the slurry mixer, the hot water outlet is connected to the water inlet of the slurry mixer, and the outlet of the slurry mixer is connected to the inlet of the washing system.
3. The energy efficient coal-fired power plant flue gas desulphurization system as claimed in claim 1, wherein, The heat exchange device includes a hot water tank and heat exchange coils. The hot water tank is equipped with multiple sets of vertically arranged and parallel heat exchange coils. Each heat exchange coil has an inlet pipe and an outlet pipe extending out of the hot water tank. The hot water tank has a cooling water inlet and a hot water outlet.
4. The energy efficient coal-fired power plant flue gas desulphurization system as claimed in claim 3, wherein, It also includes a dehydration system, which has a recycled water outlet, the discharge pipe is connected to the inlet of the dehydration system, and the recycled water outlet is connected to the cooling water inlet.
5. The energy efficient coal-fired power plant flue gas desulphurization system as claimed in claim 4, wherein, The dewatering system includes a first hydrocyclone, a vacuum belt dewatering machine, an air-water separator, and a recovery water tank. The inlet of the first hydrocyclone is connected to the discharge pipe, the underflow outlet of the first hydrocyclone is connected to the inlet of the vacuum belt dewatering machine, and its overflow outlet is connected to the inlet of the recovery water tank. The air-water outlet of the vacuum belt dewatering machine is connected to the inlet of the air-water separator, and the water outlet of the air-water separator is connected to the inlet of the recovery water tank. The recovery water tank has a recovery water outlet.
6. The energy efficient coal-fired power plant flue gas desulphurization system as claimed in claim 5, wherein, The dehydration system also includes a second hydrocyclone, the recycled water outlet is connected to the inlet of the second hydrocyclone, and the overflow outlet of the second hydrocyclone is connected to the inlet of the recycled water tank.
7. The energy efficient coal-fired power plant flue gas desulphurization system as claimed in claim 5, wherein, The desulfurization system includes a pre-washing tower, an absorption tower, a slurry pipeline, and a mixer. The exhaust port of the pre-washing tower is connected to the air inlet of the absorption tower. One end of the slurry pipeline is connected to the bottom outlet of the absorption tower, and the other end is connected to the spray inlet of the pre-washing tower. The mixer is installed on the slurry pipeline and is connected to the recovery water tank. The recovery water outlet is also connected to the water inlet of the mixer. The bottom outlet of the pre-washing tower and the bottom outlet of the absorption tower are both connected to the feed pipeline.
8. The energy efficient coal-fired power plant flue gas desulphurization system as claimed in claim 7, wherein, The mixer is a Venturi mixer.
9. The energy efficient coal-fired power plant flue gas desulphurization system as claimed in claim 7, wherein, The pre-washing tower has a first circulation pipe and a first outlet pipe. One end of the first circulation pipe is connected to the bottom outlet of the pre-washing tower, and the other end is connected to the spray inlet of the pre-washing tower. One end of the first outlet pipe is connected to the bottom outlet of the pre-washing tower, and the other end is connected to the feed pipe.
10. The energy efficient coal-fired power plant flue gas desulphurization system as claimed in claim 7 wherein, The absorption tower has a second circulation pipeline and a second production pipeline, one end of the second circulation pipeline is connected with the tower bottom outlet of the absorption tower, the other end is connected with the spray inlet of the absorption tower, one end of the second production pipeline is connected with the tower bottom outlet of the absorption tower, the other end is connected with the feed pipeline.