A CO2 capture device for flue gas from a coal-fired power plant

Abstract

This utility model discloses a CO2 capture device for flue gas from a coal-fired power plant, comprising a heat exchange tank, a water washing tank, and a desulfurization tank connected in sequence. A high-temperature inlet pipe is connected to the lower end of the heat exchange tank, and a normal-temperature outlet pipe is connected to the upper end. The end of the normal-temperature outlet pipe away from the heat exchange tank is connected to the lower end of the water washing tank. A heat utilization component is installed inside the heat exchange tank, including an upper sealing plate and a lower sealing plate at the upper and lower ends of the heat exchange tank, respectively. An upper fixing plate and a lower fixing plate are respectively installed inside the heat exchange tank near the upper and lower ends, and several heat exchange tubes are arranged between the upper and lower fixing plates. Cold water pipes and hot water pipes are respectively connected to the upper and lower ends of the heat exchange tank. This utility model can reuse the heat from high-temperature flue gas to heat water, which can then be used in other production processes, reducing unnecessary energy waste and making full use of energy.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, specifically to a CO2 capture device for flue gas from coal-fired power plants. Background Technology

[0002] Carbon dioxide is one of the major greenhouse gases. Its accumulation in the atmosphere leads to global warming, triggering a series of environmental problems such as extreme weather events, sea-level rise, and ecosystem destruction. Coal-fired power plants are one of the main sources of carbon dioxide emissions. By capturing carbon dioxide, greenhouse gas emissions can be significantly reduced, mitigating the impacts of climate change. In addition, it can also protect the environment and ecology, reduce acid rain and air pollution, mitigate the negative impacts of climate change on ecosystems, and protect biodiversity.

[0003] Chemical absorption is currently the most widely used method. It involves a chemical reaction between a chemical absorbent (such as an alkanolamine solvent) and carbon dioxide in the flue gas, thereby capturing the carbon dioxide. Before chemical absorption, the flue gas needs to be pretreated to remove residual pollutants (sulfides, particulate matter, etc.). In existing technologies, the flue gas is at a high temperature when it is discharged. When it enters a water washing device for particulate matter removal, the heat from the flue gas is directly lost, resulting in inefficient energy utilization and waste. Therefore, there is room for technological improvement. Utility Model Content

[0004] This invention aims to solve the aforementioned technical problem that the flue gas temperature is high when it is discharged, and the heat of the flue gas is directly lost due to the spraying and removal of particulate matter in the water washing device. It provides a CO2 capture device for flue gas from coal-fired power plants.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a CO2 capture device in flue gas of a coal-fired power plant, comprising a heat exchange tank, a water washing tank, and a desulfurization tank connected in sequence;

[0006] The heat exchange tank is connected to a high-temperature air inlet pipe at its lower end and a normal-temperature air outlet pipe at its upper end. The end of the normal-temperature air outlet pipe away from the heat exchange tank is connected to the water washing tank near its lower end. The heat exchange tank is equipped with a heat utilization component, which includes an upper sealing plate and a lower sealing plate at the upper and lower ends of the heat exchange tank, respectively. An upper fixing plate and a lower fixing plate are respectively provided inside the heat exchange tank near the upper and lower ends, and a plurality of heat exchange pipes are arranged between the upper and lower fixing plates. Cold water pipes and hot water pipes are respectively connected to the upper and lower ends of the heat exchange tank.

[0007] Furthermore, a grid plate is provided inside the heat exchange tank and above the upper fixed plate, and the grid plate is umbrella-shaped.

[0008] Furthermore, there are spaces between the upper fixing plate and the upper sealing plate, and between the lower fixing plate and the lower sealing plate.

[0009] Furthermore, a thermometer is installed on the hot water pipe; a viewing window is installed on the heat exchange tank.

[0010] Furthermore, the washing tank is provided with several layers of packing material, and the outside of the washing tank is provided with several feed inlets corresponding to the packing material. A pump and a spray pipe are provided on one side of the washing tank, and the spray pipe extends into the washing tank and is provided with several nozzles.

[0011] Furthermore, the upper end of the washing tank is connected to a gas guide pipe, and the other end of the gas guide pipe extends into the lower end of the desulfurization tank.

[0012] Furthermore, the desulfurization tank is provided with an inner cylinder, and the gas guide pipe extends into the inner cylinder; the inner cylinder is filled with activated carbon, and the inner cylinder is provided with several rectangular through grooves; the upper end of one side of the desulfurization tank is provided with a gas outlet pipe.

[0013] The advantages of this utility model compared with the prior art are as follows:

[0014] It can reuse the heat from high-temperature flue gas to heat water, and then use the hot water in other production processes, reducing unnecessary energy waste and making full use of energy. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is an exploded view of the heat exchange tank of this utility model.

[0017] Figure 3 This is a cross-sectional view of the desulfurization tank of this utility model.

[0018] As shown in the figure: 1. Heat exchange tank, 2. Water washing tank, 3. Desulfurization tank, 4. High temperature air inlet pipe, 5. Normal temperature air outlet pipe, 6. Upper sealing plate, 7. Lower sealing plate, 8. Upper fixing plate, 9. Lower fixing plate, 10. Heat exchange tube, 11. Grating plate, 12. Cold water pipe, 13. Hot water pipe, 14. Thermometer, 15. Viewing window, 16. Feed inlet, 17. Spray pipe, 18. Air guide pipe, 19. Inner cylinder, 20. Rectangular through groove, 21. Air outlet pipe. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] Example 1, in conjunction with Appendix Figure 1 A CO2 capture device for flue gas from a coal-fired power plant includes a heat exchange tank 1, a water washing tank 2, and a desulfurization tank 3 connected in sequence; the flue gas is pretreated through the heat exchange tank 1, water washing tank 2, and desulfurization tank 3, and the desulfurization tank 3 is connected to the subsequent capture step.

[0021] Combined with appendix Figure 1 , 2 The heat exchange tank 1 is connected to a high-temperature air inlet pipe 4 at the lower end and a normal temperature air outlet pipe 5 at the upper end. The end of the normal temperature air outlet pipe 5 away from the heat exchange tank 1 is connected to the water washing tank 2 near the lower end. The high-temperature air inlet pipe 4 is connected to a high-temperature flue gas pipe and is used to introduce high-temperature flue gas into the heat exchange tank 1.

[0022] Combined with appendix Figure 1 , 2 The heat exchange tank 1 is equipped with a heat utilization component. Specifically, the heat utilization component includes an upper sealing plate 6 and a lower sealing plate 7 located at the upper and lower ends of the heat exchange tank 1, respectively, to seal the heat exchange tank 1. An upper fixing plate 8 and a lower fixing plate 9 are located inside the heat exchange tank 1 near the upper and lower ends, respectively, and a plurality of heat exchange tubes 10 are arranged between the upper fixing plate 8 and the lower fixing plate 9. A cold water pipe 12 and a hot water pipe 13 are connected to the heat exchange tank 1 near the upper and lower ends, respectively, and a thermometer 14 is installed on the hot water pipe 13. A viewing window 15 is provided on the heat exchange tank 1. In the above structure, high-temperature flue gas enters the heat exchange tank 1 from the high-temperature inlet pipe 4 and disperses into the plurality of heat exchange tubes 10. Cold water is added to the heat exchange tank 1 through the cold water pipe 12. After being heated by the high-temperature flue gas, the cold water is discharged through the hot water pipe 13 for other production operations, making full use of energy and reducing waste.

[0023] A grid plate 11 is provided inside the heat exchange tank 1 and above the upper fixed plate 8. The grid plate 11 is umbrella-shaped and can reduce the amount of flue gas that has not been sufficiently cooled from the ambient temperature outlet pipe 5.

[0024] In addition, there are spaces between the upper fixed plate 8 and the upper sealing plate 6, and between the lower fixed plate 9 and the lower sealing plate 7, so that the high-temperature flue gas can enter each heat exchange tube 10 evenly.

[0025] Combined with appendix Figure 1 The washing tank 2 is equipped with several layers of packing. The outer side of the washing tank 2 is equipped with several feed inlets 16 corresponding to the packing. A pump and a spray pipe 17 are provided on one side of the washing tank 2. The spray pipe 17 extends into the washing tank 2 and is equipped with several nozzles. The packing is ceramic packing. The packing plays the role of increasing the gas-liquid contact area, promoting mass transfer, reducing pressure drop and preventing mist entrainment.

[0026] Based on the above structure, the upper end of the water washing tank 1 is connected to a gas guide pipe 18, and the other end of the gas guide pipe 18 extends into the lower end of the desulfurization tank 3 to introduce the water-washed flue gas into the desulfurization tank 3.

[0027] Combined with appendix Figure 1 , 3 The desulfurization tank 3 is equipped with an inner cylinder 19, and the gas guide pipe 18 extends into the inner cylinder 19. The inner cylinder 19 is filled with activated carbon, and the inner cylinder 19 is provided with several rectangular through grooves 20. The upper end of one side of the desulfurization tank 3 is provided with a gas outlet pipe 21. The activated carbon has a strong adsorption capacity and can effectively desulfurize.

[0028] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A device for CO2 capture from flue gas of a coal-fired power plant, characterized by: It includes a heat exchange tank (1), a water washing tank (2), and a desulfurization tank (3) connected in sequence; The heat exchange tank (1) is connected to a high-temperature air inlet pipe (4) at its lower end and to a normal-temperature air outlet pipe (5) at its upper end. The end of the normal-temperature air outlet pipe (5) away from the heat exchange tank (1) is connected to the water washing tank (2) near its lower end. The heat exchange tank (1) is equipped with a heat utilization component, which includes an upper sealing plate (6) and a lower sealing plate (7) respectively provided at the upper and lower ends of the heat exchange tank (1). The heat exchange tank (1) is equipped with an upper fixing plate (8) and a lower fixing plate (9) respectively near the upper and lower ends. A plurality of heat exchange pipes (10) are provided between the upper fixing plate (8) and the lower fixing plate (9). The heat exchange tank (1) is equipped with a cold water pipe (12) and a hot water pipe (13) respectively near the upper and lower ends.

2. The CO2 capture device in flue gas of a coal-fired power plant according to claim 1, characterized in that: The heat exchange tank (1) is provided with a grid plate (11) inside and above the upper fixed plate (8), and the grid plate (11) is umbrella-shaped.

3. The CO2 capture device in flue gas of a coal-fired power plant according to claim 1, characterized in that: There is space between the upper fixing plate (8) and the upper sealing plate (6), and between the lower fixing plate (9) and the lower sealing plate (7).

4. The CO2 capture device in flue gas of a coal-fired power plant according to claim 1, characterized in that: A thermometer (14) is provided on the hot water pipe (13); a viewing window (15) is provided on the heat exchange tank (1).

5. The CO2 capture device in flue gas of a coal-fired power plant according to claim 1, characterized in that: The washing tank (2) is provided with several layers of packing material. The washing tank (2) is provided with several feed inlets (16) corresponding to the packing material on the outside. The washing tank (2) is provided with a pump and a spray pipe (17) on one side. The spray pipe (17) extends into the washing tank (2) and is provided with several nozzles.

6. The CO2 capture device in flue gas of a coal-fired power plant according to claim 1, characterized in that: The upper end of the washing tank (2) is connected to a gas guide pipe (18), and the other end of the gas guide pipe (18) extends into the lower end of the desulfurization tank (3).

7. A CO2 capture device for flue gas from a coal-fired power plant according to claim 6, characterized in that: The desulfurization tank (3) is provided with an inner cylinder (19), and a gas guide pipe (18) extends into the inner cylinder (19); the inner cylinder (19) is filled with activated carbon, and the inner cylinder (19) is provided with several rectangular through grooves (20); the upper end of one side of the desulfurization tank (3) is provided with a gas outlet pipe (21).

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