Flue gas purification device for thermal power plant

Abstract

The invention provides a flue gas purification device for a thermal power plant. The flue gas purification device comprises a purification tank, a gas-liquid heat exchanger and a water storage tank, a steam settling bin, a filtering bin and a spraying bin are arranged in the purifying box side by side; a gas-liquid heat exchanger is arranged on the outer top wall of the purification box and is provided with a flue gas inlet, a flue gas outlet, a cold water inlet and a hot water outlet; the cold water inlet and the hot water outlet are communicated with the water storage tank; the steam settling bin is communicated with the flue gas outlet; the water storage tank is communicated with a steam generation assembly, and the steam generation assembly is communicated with the steam settling bin; a filtering assembly is arranged in the filtering bin; a spraying assembly is arranged in the spraying bin, and the spraying bin communicates with an exhaust port. By arranging the steam settling bin, the filtering bin and the spraying bin, flue gas is subjected to triple-process purification, after entering the steam settling bin, the flue gas makes contact with high-temperature steam to accelerate settling, most of unsettled large-particle impurities are filtered in the filtering bin, spraying purification is conducted in the spraying bin, and the flue gas purification effect is improved.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology for thermal power plants, and more particularly to a flue gas purification device for thermal power plants. Background Technology

[0002] The main pollutants from thermal power plants include soot, particulate matter, and heavy metals. The treatment of particulate matter in flue gas is the core process of flue gas treatment. Since flue gas carries a lot of heat when it is discharged, heat exchangers are usually used to recover the heat in the flue gas. Existing waste heat recovery devices usually participate in the operation of the boiler after the waste heat is recovered. However, there is a certain distance between the heat exchanger and the boiler after heat exchange, which will lead to heat loss during the transportation process, affecting the efficiency and effect of waste heat recovery. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] To achieve the above objectives, the present invention proposes a flue gas purification device for thermal power plants, comprising a purification box, a gas-liquid heat exchanger, and a water storage tank.

[0005] The purification chamber contains a steam settling chamber, a filter chamber, and a spray chamber arranged side by side. A gas-liquid heat exchanger is installed on the top wall of the purification box. The gas-liquid heat exchanger is provided with a flue gas inlet, a flue gas outlet, a cold water inlet, and a hot water outlet. Both the cold water inlet and the hot water outlet are connected to the water storage tank. The steam settling chamber is connected to the flue gas outlet; the water storage tank is connected to a steam generating assembly, which is connected to the steam settling chamber. The filter chamber is equipped with a filter assembly; The spray chamber is equipped with a spray assembly, and the spray chamber is connected to an exhaust port.

[0006] This invention employs a three-stage purification process for flue gas, consisting of a steam settling chamber, a filter chamber, and a spray chamber. In the steam settling chamber, the flue gas comes into contact with high-temperature steam, accelerating the settling of particulate matter. In the filter chamber, most of the large, unset particles are filtered out. Finally, the flue gas enters the spray chamber for final purification. This significantly improves the purification effect of the flue gas.

[0007] Optionally, the steam generating assembly includes a steam box disposed below the water storage tank, and a water supply pipe is provided between the steam box and the water storage tank, and a first control valve is provided on the water supply pipe; An electric heating plate is installed inside the steam box; a steam pipe is connected to the steam settling chamber, and one end of the steam pipe extends into the steam settling chamber.

[0008] Furthermore, the port of the steam pipe that extends into the steam settling chamber is vertically upward; A baffle plate is installed at the pipe opening where the steam pipe enters the steam settling chamber.

[0009] Furthermore, the horizontal projected area of ​​the guide plate is larger than the inlet area of ​​the steam pipe.

[0010] Furthermore, a waste collection bin is provided at the bottom of the steam settling chamber.

[0011] Furthermore, the bottom of the filter chamber is connected to the bottom of the steam settling chamber; a lusheng pipe is connected to the top of the filter chamber, and the other end of the lusheng pipe is located at the bottom of the spray chamber.

[0012] Furthermore, the filter assembly includes a first filter screen, a second filter screen, and a fan assembly arranged sequentially from bottom to top within the filter chamber.

[0013] Furthermore, the spray assembly includes a first water pump, an annular pipe, and a pumping pipe; The first water pump is installed on the outer top wall of the purification tank, and the inlet of the first water pump is connected to the water pumping pipe, and the outlet of the first water pump is connected to the annular water pump. The annular pipe is suspended on the top wall of the spray chamber, and multiple nozzles are arranged on the annular pipe facing the bottom wall of the spray chamber. The other end of the water pumping pipe is connected to the bottom of the spray chamber; The bottom of the spray chamber is filled with water to form a water layer, and the height of the water layer is higher than the height of the opening of the Lusheng pipe inside the spray chamber.

[0014] Furthermore, a wastewater discharge outlet is provided at the bottom of the spray chamber, and a second control valve is provided at the wastewater discharge outlet.

[0015] Furthermore, a second water pump is installed on the pipe connecting the cold water inlet and the water storage tank.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the internal structure of the purification box of a flue gas purification device for a thermal power plant according to the present invention. Figure 2 This is a side view of the purification box of a flue gas purification device for a thermal power plant according to the present invention, showing only the connection structure of the gas-liquid heat exchanger. Figure 3 This is a schematic diagram of the internal structure of the purification box of a flue gas purification device for a thermal power plant according to the present invention. Figure 4 This is a schematic diagram of the internal structure of the spray chamber of a flue gas purification device for a thermal power plant according to the present invention; Figure 5 This is a schematic diagram of the spray assembly structure of a flue gas purification device for a thermal power plant according to the present invention; Figure 6 It is based on Figure 1 A magnified view of part A in the diagram.

[0018] Explanation of reference numerals in the attached figures: 1. Purification chamber; 11. Steam settling chamber; 12. Filter chamber; 13. Spray chamber; 14. Exhaust port; 15. Wastewater discharge port; 16. Second control valve; 17. Waste collection chamber; 2. Gas-liquid heat exchanger; 21. Flue gas inlet; 22. Flue gas outlet; 23. Cold water inlet; 24. Hot water outlet; 25. Second water pump; 3. Water storage tank; 4. Steam generating assembly; 41. Steam box; 42. Water supply pipe; 43. First control valve; 44. Electric heating plate; 45. Steam pipe; 46. Baffle plate; 47. Isolation plate; 5. Filter assembly; 51. First filter screen; 52. Second filter screen; 53. Fan assembly; 6. Spray assembly; 61. Lusheng pipe; 62. First water pump; 63. Circular pipe; 64. Pumping pipe; 65. Nozzle; 66. Water injection layer. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] This invention proposes a flue gas purification device for thermal power plants, as described below. Figures 1 to 6 Please provide a detailed explanation.

[0021] A flue gas purification device for thermal power plants includes a purification box 1, a gas-liquid heat exchanger 2, and a water storage tank 3. The purification chamber 1 contains a steam settling chamber 11, a filter chamber 12, and a spray chamber 13 arranged side by side. A gas-liquid heat exchanger 2 is installed on the outer top wall of the purification box 1. The gas-liquid heat exchanger 2 is provided with a flue gas inlet 21, a flue gas outlet 22, a cold water inlet 23, and a hot water outlet 24. Both the cold water inlet 23 and the hot water outlet 24 are connected to the water storage tank 3; a second water pump 25 is installed on the pipe connecting the cold water inlet 23 and the water storage tank 3.

[0022] The steam settling chamber 11 is connected to the flue gas outlet 22; the water storage tank 3 is connected to the steam generating component 4, and the steam generating component 4 is connected to the steam settling chamber 11. The filter chamber 12 is equipped with a filter assembly 5; The spray chamber 13 is equipped with a spray assembly 6, and the spray chamber 13 is connected to an exhaust port 14.

[0023] Specifically, the flue gas first enters the gas-liquid heat exchanger 2 from the flue gas inlet 21. At this time, the second water pump 25 supplies cold water from the water storage tank to the gas-liquid heat exchanger 2. The cold water exchanges heat with the flue gas in the gas-liquid heat exchanger 2, turns into hot water, and returns to the water storage tank 3, thereby maintaining a stable water temperature in the water storage tank 3. When the flue gas enters the steam settling chamber 11 from the flue gas outlet 22, the steam generating component 4 evaporates the hot water obtained from the water storage tank 3 into steam and sends the steam into the steam settling chamber 11. The high-temperature steam comes into full contact with the flue gas in the steam settling chamber 11, thereby accelerating the settling of particulate matter in the flue gas. After contacting the steam, the flue gas enters the filter chamber 12, which filters the flue gas, filtering out most of the large particulate impurities that have not settled, thereby further purifying the flue gas. Finally, the flue gas enters the spray chamber 13 for the final spray purification operation. This invention improves the purification effect of flue gas by setting up a steam settling chamber 11, a filter chamber 12, and a spray chamber 13 to purify the flue gas through a triple process.

[0024] In some embodiments, the steam generating assembly 4 includes a steam box 41 disposed below the water storage tank 3, and a water supply pipe 42 is provided between the steam box 41 and the water storage tank 3, and a first control valve 43 is provided on the water supply pipe 42. An electric heating plate 44 is installed inside the steam box 41 to heat the hot water to generate steam; a steam pipe 45 is provided to connect the steam box 41 and the steam settling chamber 11, and one end of the steam pipe 45 extends into the steam settling chamber 11.

[0025] Specifically, in order to ensure sufficient contact between steam and flue gas, a steam pipe 45 is inserted through the steam settling chamber 11, with one end located near the bottom of the steam settling chamber 11. The pipe opening connecting the steam settling chamber 11 and the flue gas outlet 22 is located at the top of the steam settling chamber 11, so that the steam moves from bottom to top and the flue gas moves from top to bottom, thereby causing the steam and flue gas to collide and mix with each other, further improving the mixing and contact effect of the steam and flue gas. Furthermore, the amount of hot water entering the steam box 41 can be controlled through the first control valve 43, thereby achieving the effect of controlling the amount of steam generated.

[0026] Furthermore, an isolation plate 47 is installed between the steam inlet of the steam pipe 45 and the outlet of the water supply pipe 42. A steam channel is formed between the isolation plate 47 and the side wall where the steam inlet is located. When hot water is continuously poured into the steam box 41, the steam has nowhere to escape from the side of the water supply pipe 42 due to the continuous supply of water. The steam will accumulate rapidly between the isolation plate 47 and the top wall of the steam box 41. However, when hot water is continuously supplied into the steam box 41, the steam will quickly escape towards the side of the steam channel connected to the external environment under pressure, thereby achieving the technical effect of quickly collecting steam and supplying it to the steam pipe 45.

[0027] In some embodiments, the port of the steam pipe 45 extending into the steam settling chamber 11 is vertically upward. A baffle plate 46 is installed at the pipe opening of the steam pipe 45 that extends into the steam settling chamber 11.

[0028] Specifically, the vertically upward setting of the pipe opening facilitates the rapid dissipation of steam and avoids the occurrence of lateral steam movement caused by steam being discharged from other angles. This reduces the heat loss during the lateral movement of steam. Furthermore, the vertically upward setting of the pipe opening allows the initial velocity of the steam ejected from the pipe to be fully used for upward movement, reducing the loss of kinetic energy and accelerating the collision process between flue gas and steam, thus reducing energy consumption. The baffle plate 46 can disperse the bundle of steam from the nozzle into the entire steam settling chamber 11. After the steam hits the baffle plate 46, it will move laterally to a certain extent, thereby expanding the spray coverage of the steam bundle.

[0029] In some embodiments, the horizontal projected area of ​​the baffle plate 46 is larger than the opening area of ​​the steam pipe 45, that is, the baffle plate 46 can completely cover the opening, thereby preventing particulate matter from entering the steam pipe 45 during the settling process.

[0030] In some embodiments, a waste collection chamber 17 is provided at the bottom of the steam settling chamber 11 to facilitate the collection of waste during the settling process. The waste collection chamber 17 is also located below the filter chamber 12, so that the filtered material is also collected into the waste collection chamber 17.

[0031] In some embodiments, multiple steam pipes 45 are provided, and the steam pipes 45 are arranged in parallel rows, so that steam can further fill the entire steam settling chamber 11.

[0032] In some embodiments, the bottom of the filter chamber 12 is connected to the bottom of the steam settling chamber 11; a reed pipe 61 is connected to the top of the filter chamber 12, and the other end of the reed pipe 61 is located at the bottom of the spray chamber 13. A W-shaped air passage is formed between the steam settling chamber 11, the filter chamber 12, and the spray chamber 13, which prolongs the movement path of the flue gas, increases the purification time, and thus improves the purification effect of the flue gas.

[0033] In some embodiments, the filter assembly 5 includes a first filter screen 51, a second filter screen 52, and a fan assembly 53 arranged sequentially from bottom to top within the filter chamber 12. The first filter screen 51 is configured as a coarse filter screen, and the second filter screen 52 is configured as a fine filter screen, thereby performing multi-stage filtration of the flue gas; the fan assembly 53 is configured to provide power for the flow of flue gas, preventing the filter screens from causing flue gas backflow or accumulation in the steam settling chamber 11.

[0034] In some embodiments, the spray assembly 6 includes a first water pump 62, an annular pipe 63, and a water pumping pipe 64; The first water pump 62 is installed on the outer top wall of the purification box 1, and the inlet of the first water pump 62 is connected to the water pumping pipe 64, and the outlet of the first water pump 62 is connected to the annular water pump. The annular pipe 63 is suspended on the top wall of the spray chamber 13, and multiple nozzles 65 are provided on the annular pipe 63 facing the bottom wall of the spray chamber 13. The other end of the water pumping pipe 64 is connected to the bottom of the spray chamber 13; Water is injected into the bottom of the spray chamber 13 to form a water injection layer 66, and the height of the water injection layer 66 is higher than the height of the opening of the reed pipe 61 inside the spray chamber 13.

[0035] Specifically, the flue gas discharged from the reed pipe 61 first comes into contact with the water injection layer 66, where soluble substances and some unfiltered particulate matter dissolve in the water. A second water pump 25 then draws water from the water injection layer 66 into the annular pipe for spraying, thus purifying the flue gas emanating from the water injection layer 66. This process increases the contact area between the flue gas and water, allowing soluble substances or particulate matter that were not in contact with water in the water injection layer 66 to come into contact with the moisture in the water mist, improving the purification effect. Finally, the purified flue gas is discharged from the exhaust port 14.

[0036] In some embodiments, a wastewater discharge port 15 is provided at the bottom of the spray chamber 13, and a second control valve 16 is provided at the wastewater discharge port 15. When it is necessary to replace the water in the water injection layer 66, the second control valve 16 is opened, and the wastewater discharge port 15 can drain all the wastewater in the water injection layer 66. The staff can then reconnect the water supply pipe 42 to the wastewater discharge port 15 to inject clean water into the spray chamber 13, thereby completing the water replacement in the water injection layer 66.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flue gas purification device for thermal power plants, characterized in that, Includes a purification box, a gas-liquid heat exchanger, and a water storage tank; The purification chamber contains a steam settling chamber, a filter chamber, and a spray chamber arranged side by side. A gas-liquid heat exchanger is installed on the top wall of the purification box. The gas-liquid heat exchanger is provided with a flue gas inlet, a flue gas outlet, a cold water inlet, and a hot water outlet. Both the cold water inlet and the hot water outlet are connected to the water storage tank. The steam settling chamber is connected to the flue gas outlet; the water storage tank is connected to a steam generating assembly, which is connected to the steam settling chamber. The filter chamber is equipped with a filter assembly; The spray chamber is equipped with a spray assembly, and the spray chamber is connected to an exhaust port.

2. The flue gas purification device for thermal power plants as described in claim 1, characterized in that, The steam generating assembly includes a steam box located below the water storage tank, and a water supply pipe is provided between the steam box and the water storage tank. A first control valve is provided on the water supply pipe. An electric heating plate is installed inside the steam box; a steam pipe is connected to the steam settling chamber, and one end of the steam pipe extends into the steam settling chamber.

3. The flue gas purification device for thermal power plants as described in claim 2, characterized in that, The steam pipe extends vertically upwards through one end into the steam settling chamber. A baffle plate is installed at the pipe opening where the steam pipe enters the steam settling chamber.

4. The flue gas purification device for thermal power plants as described in claim 3, characterized in that, The horizontal projected area of ​​the guide plate is larger than the opening area of ​​the steam pipe.

5. The flue gas purification device for thermal power plants as described in claim 1, characterized in that, The bottom of the steam settling chamber is equipped with a waste collection chamber.

6. The flue gas purification device for thermal power plants as described in claim 1, characterized in that, The bottom of the filter chamber is connected to the bottom of the steam settling chamber; a lusheng pipe is connected to the top of the filter chamber, and the other end of the lusheng pipe is located at the bottom of the spray chamber.

7. A flue gas purification device for thermal power plants as described in claim 6, characterized in that, The filter assembly includes a first filter screen, a second filter screen, and a fan assembly arranged sequentially from bottom to top within the filter chamber.

8. The flue gas purification device for thermal power plants as described in claim 6, characterized in that, The spray assembly includes a first water pump, an annular pipe, and a pumping pipe; The first water pump is installed on the outer top wall of the purification tank, and the inlet of the first water pump is connected to the water pumping pipe, and the outlet of the first water pump is connected to the annular water pump. The annular pipe is suspended on the top wall of the spray chamber, and multiple nozzles are arranged on the annular pipe facing the bottom wall of the spray chamber. The other end of the water pumping pipe is connected to the bottom of the spray chamber; The bottom of the spray chamber is filled with water to form a water layer, and the height of the water layer is higher than the height of the opening of the Lusheng pipe inside the spray chamber.

9. The flue gas purification device for thermal power plants as described in claim 1, characterized in that, The bottom of the spray chamber is provided with a wastewater discharge outlet, and a second control valve is provided at the wastewater discharge outlet.

10. The flue gas purification device for thermal power plants as described in claim 1, characterized in that, A second water pump is installed on the pipe connecting the cold water inlet and the water storage tank.

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