Dual cyclone venturi water film dust collector for carbon capture system of coal-fired power plant

Abstract

This invention belongs to the technical field of dust removal equipment and discloses a dual-cyclone Venturi water film dust collector for a coal-fired power plant carbon capture system. It includes a gas-liquid mixer, a dual-cyclone cylinder, and a cyclone guide assembly. The gas-liquid mixer includes a Venturi tube and a cyclone mixing assembly. The Venturi tube's inlet is for the inflow of coal dust gas from the coal-fired power plant carbon capture system, its liquid inlet is for introducing water flow, and its outlet is for the outflow of high-speed mixed gas flow. The cyclone mixing assembly is used to repeatedly agitate and mix the gas-liquid mixture. The outer and inner cylinders of the dual-cyclone cylinder are connected, with the outer cylinder connected to the outlet of the gas-liquid mixer. Cyclone cleaning water flows through both the outer and inner cylinders. The drain outlet is for discharging coal slurry water, and the exhaust outlet is for the outflow of dust-removed gas. The cyclone guide assembly is located in the inner cylinder to enhance the cyclone cleaning water flow intensity within the inner cylinder. This structure effectively improves the dust removal efficiency and space utilization of the dust collector.

Description

Technical Field

[0001] This invention relates to the field of dust removal equipment technology, and in particular to a dual-cyclone Venturi water film dust collector for a carbon capture system in a coal-fired power plant. Background Technology

[0002] The coal conveying system is an important component of the thermal power generation system, bearing the heavy responsibility of supplying "food" for the operation of the power plant. The coal conveying system of the power plant mainly consists of coal unloading, coal storage, conveying, screening and crushing and auxiliary facilities.

[0003] However, the entire coal unloading and conveying process is often accompanied by the generation of dust-laden airflow. Due to the blowing effect, this dust-laden airflow causes a large amount of scattered dust, forming a significant amount of coal dust, which seriously affects the occupational health of workers. Furthermore, dust particles accelerate the wear and tear on machinery and can easily lead to safety accidents such as poor contact in electrical equipment. At the same time, traditional dust collectors suffer from low dust removal efficiency, corrosion of equipment by coal slurry and washing water, and high daily maintenance costs during the entire coal unloading and conveying process.

[0004] Therefore, there is an urgent need for a dual-cyclone venturi water film dust collector for carbon capture systems in coal-fired power plants to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a dual-cyclone venturi water film dust collector for a carbon capture system in a coal-fired power plant, which can improve dust removal efficiency and space utilization, reduce maintenance costs, effectively reduce dust and other pollution generated during coal unloading and transportation, and protect the occupational health of workers and the normal operation of equipment.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A dual-cyclone Venturi water film dust collector for carbon capture systems in coal-fired power plants includes:

[0008] A gas-liquid mixer includes a venturi tube and a swirl mixing assembly. The air inlet of the venturi tube is used for the inflow of coal dust gas in the carbon capture system of a coal-fired power plant, and the liquid inlet of the venturi tube is used for the introduction of water flow. The outlet of the venturi tube is used for the outflow of high-speed mixed gas flow. The swirl mixing assembly is disposed inside the venturi tube and is used to repeatedly agitate and mix the mixed fluid after gas-liquid mixing.

[0009] The double cyclone cylinder includes an outer cylinder and an inner cylinder, which are connected to each other. The outer cylinder is connected to the outlet of the gas-liquid mixer. Cyclone cleaning water flows through both the outer cylinder and the inner cylinder to mix with the dust in the mixed fluid to form coal slurry water. The bottom of the outer cylinder and the bottom of the inner cylinder are provided with drain ports for discharging the coal slurry water. The top of the inner cylinder is provided with an exhaust port for the gas after dust removal to flow out.

[0010] A vortex guide component is disposed in the inner cylinder, and the vortex guide component is used to enhance the vortex intensity of the vortex cleaning water flow in the inner cylinder.

[0011] Optionally, the venturi tube includes a converging tube, a throat, and a diverging tube connected in sequence. The air inlet is located at the end of the converging tube away from the throat, the liquid inlet is located at the throat near the converging tube, and the outlet is located at the end of the diverging tube away from the throat.

[0012] Optionally, the swirl mixing assembly includes a mixing cross plate disposed in the throat and located downstream of the air inlet and the liquid inlet, the mixing cross plate being used to perform a disturbance mixing of the mixed fluid.

[0013] Optionally, the swirl mixing assembly includes a plurality of cutting heads, which are distributed on the inner wall of the throat and located downstream of the air inlet and the liquid inlet. The cutting heads are used to perform secondary agitation mixing on the mixed fluid.

[0014] Optionally, the upper part of the circumferential sidewall of the outer cylinder is provided with a first tangential air port, which is connected to the outlet of the gas-liquid mixer; the lower part of the circumferential sidewall of the inner cylinder is provided with a second tangential air port, which is used to connect the outer cylinder and the inner cylinder.

[0015] Optionally, the swirling flow guiding assembly includes a swirling fan, which is disposed in the inner cylinder and located above the second tangential air inlet. The swirling fan is used to enhance the swirling intensity of the swirling cleaning water flow in the inner cylinder.

[0016] Optionally, a first liquid inlet is provided on the upper part of the circumferential sidewall of the outer cylinder, which is used for the inflow of clean water into the outer cylinder; a second liquid inlet is provided on the upper part of the circumferential sidewall of the inner cylinder, which is used for the inflow of clean water into the inner cylinder.

[0017] Optionally, the inner cylinder is further provided with a negative pressure fan, which is located at the exhaust port and is used to make the clean water flow in the inner cylinder form a cyclone clean water flow.

[0018] Optionally, the system also includes a water supply system connected to the Venturi tube, the outer cylinder, and the inner cylinder, which supplies water to the Venturi tube, the outer cylinder, and the inner cylinder.

[0019] Optionally, the water supply system includes a water storage tank, a water supply pump, a main water pipe, a nozzle, a first water supply pipe, and a second water supply pipe. The main water pipe is connected to the water storage tank, the water supply pump is connected to the main water pipe, and the two ends of the nozzle are respectively connected to the main water pipe and the venturi tube. The two ends of the first water supply pipe are respectively connected to the main water pipe and the outer cylinder. The two ends of the second water supply pipe are respectively connected to the main water pipe and the inner cylinder.

[0020] The beneficial effects of this invention are:

[0021] This invention provides a dual-cyclone Venturi water film dust collector for a coal-fired power plant carbon capture system. By enhancing the Venturi effect of the Venturi tube, the flow velocity of the coal dust gas is significantly increased, causing relative motion between the gas, liquid, and solid phases. The swirling mixing component within the Venturi tube enhances the mixing degree of the coal dust gas and water mist, causing small coal powder particles to combine into larger particles, increasing particle mass and centrifugal force, facilitating subsequent dust separation within the dual-cyclone cylinder. Simultaneously, the coal dust gas flow in the outer cylinder, after being accelerated by the gas-liquid mixer, forms a strong wall-adhering swirling flow on the outer cylinder wall, achieving the first cyclone scrubbing. Under the intense disturbance and diversion of the swirling guide component within the inner cylinder, a strong wall-adhering internal swirling upward airflow is formed, achieving the second cyclone scrubbing. These two cyclone scrubbing processes prolong the residence time of the coal dust gas flow within the dual-cyclone cylinder, effectively purifying the coal dust gas flow and significantly improving dust removal efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the dual cyclone venturi water film dust collector provided in a specific embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 3 This is a schematic diagram of the structure of the hybrid cross plate provided in a specific embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the cutting head provided in a specific embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of a vortex fan provided in a specific embodiment of the present invention.

[0027] In the picture:

[0028] 10. Gas-liquid mixer; 101. Air inlet; 102. Liquid inlet; 103. Outlet; 11. Venturi tube; 111. Converging tube; 112. Throat; 113. Diverging tube; 12. Swirl mixing assembly; 121. Mixing cross plate; 1211. Baffle plate; 122. Cutting head; 1221. Connecting part; 1222. Head;

[0029] 20. Double cyclone body; 201. Drain outlet; 202. Exhaust outlet; 21. Outer cylinder; 211. First tangential air inlet; 212. First liquid inlet; 213. First drain pipe; 22. Inner cylinder; 221. Second tangential air inlet; 222. Second liquid inlet; 223. Second drain pipe;

[0030] 31. Swirl fan; 311. Rotating shaft; 312. Blades;

[0031] 40. Water supply system; 41. Water storage tank; 42. Water supply pump; 43. Main water pipe; 44. Sprinkler pipe; 45. First water supply pipe; 46. Second water supply pipe;

[0032] 50. Coal slurry pit. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0034] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0037] The following reference Figures 1 to 5 This invention introduces a dual-cyclone venturi water film dust collector for a carbon capture system in a coal-fired power plant.

[0038] Currently, in coal-fired power plant carbon capture systems, dust collectors are mainly used to capture coal particles in the coal dust airflow generated during the coal combustion process. Specifically, during coal combustion, the unloading and conveying process often involves the generation of dust-laden airflow, which results in dust particles in the airflow. These dust particles accelerate the wear and tear on machinery and can easily lead to safety accidents such as poor contact in electrical equipment. Furthermore, traditional dust collectors suffer from low dust removal efficiency, corrosion of equipment by coal slurry and flushing water, and high daily maintenance costs during the unloading and conveying process.

[0039] Therefore, this embodiment provides a dual-cyclone Venturi water film dust collector for a coal-fired power plant carbon capture system, which solves the problems of large amounts of coal dust generated during the entire coal unloading and conveying process, low dust removal efficiency of traditional dust collectors, corrosion of equipment by coal slurry and flushing water, and high daily maintenance costs; it can improve dust removal efficiency and space utilization, reduce maintenance costs, effectively reduce dust and other pollution generated during coal unloading and conveying, and protect the occupational health of workers and the normal operation of equipment.

[0040] Please refer to Figure 1 and Figure 2Specifically, the dual-cyclone Venturi water film dust collector for the carbon capture system of this coal-fired power plant includes a gas-liquid mixer 10, a dual-cyclone cylinder 20, and a cyclone guide assembly. The gas-liquid mixer 10 includes a Venturi tube 11 and a cyclone mixing assembly 12. The air inlet 101 of the Venturi tube 11 is used for the inflow of coal dust gas from the carbon capture system of the coal-fired power plant, and the liquid inlet 102 of the Venturi tube 11 is used to introduce water flow. The outlet 103 of the Venturi tube 11 is used for the outflow of high-speed mixed gas flow. The cyclone mixing assembly 12 is disposed inside the Venturi tube 11 and is used to repeatedly agitate and mix the gas-liquid mixture. The dual-cyclone cylinder 20 includes an outer cylinder 21 and an inner cylinder 22, which are connected. The outer cylinder 21 is connected to the outlet 103 of the gas-liquid mixer 10. Cyclone cleaning water flows through both the outer cylinder 21 and the inner cylinder 22 to mix with the dust in the mixed fluid to form coal slurry water. The bottom of the outer cylinder 21 and the bottom of the inner cylinder 22 are provided with drain ports 201 for discharging coal slurry water. The top of the inner cylinder 22 is provided with an exhaust port 202 for the gas after dust removal to flow out. A cyclone guide component is provided inside the inner cylinder 22 to enhance the cyclone intensity of the cyclone cleaning water flow inside the inner cylinder 22.

[0041] In this embodiment, the carbon capture system for a coal-fired power plant uses a dual-cyclone Venturi water film dust collector. When removing coal dust from the airflow, the airflow enters the Venturi tube 11 through the inlet 101. The change in diameter of the Venturi tube 11 significantly increases the airflow velocity, creating a high-speed airflow. Water flows in through the inlet 102, causing the water to form a mist under the impact of the high-speed airflow. As the water flows through the cyclone mixing component 12, the multiple turbulence and mixing effects of the cyclone mixing component 12 cause the water mist to mix and disperse with the fine coal dust particles in the airflow, forming a mixed fluid. Then, the high-speed flowing mixed fluid enters the outer cylinder 21. Under centrifugal force, some of the coal dust particles in the mixed fluid are thrown to the wall of the outer cylinder 21 and captured by the water film formed by the cyclone cleaning water flow, forming coal slurry water, which flows out through the drain outlet 201, thus achieving the first cyclone air washing. The mixed fluid, after the first cyclone scrubbing, enters the inner cylinder 22 for a second cyclone scrubbing. Any remaining coal dust particles in the mixed fluid are thrown to the wall of the inner cylinder 22 by the cyclone guide assembly, where they are captured and removed by the water film formed by the cyclone cleaning water flow, forming coal slurry water, which flows out through the drain port 201. The gas, after dust removal, is discharged through the exhaust port 202, thus completing the dust removal of the coal dust airflow.

[0042] The aforementioned structure significantly increases the velocity of the coal dust airflow by enhancing the Venturi effect of the Venturi tube 11, causing relative motion between the gas, liquid, and solid phases. The swirling mixing component 12 within the Venturi tube 11 enhances the mixing degree between the coal dust airflow and water mist, causing small coal powder particles to combine into larger particles, increasing particle mass and centrifugal force, thus facilitating subsequent dust removal and separation within the double cyclone cylinder 20. Simultaneously, the coal dust airflow in the outer cylinder 21, after being accelerated by the gas-liquid mixer 10, forms a strong wall-adhering swirling flow on the outer cylinder 21 wall, achieving the first cyclone scrubbing. Under the intense disturbance and diversion of the swirling guide component within the inner cylinder 22, a violent wall-adhering internal swirling upward airflow is formed, achieving the second cyclone scrubbing. These two cyclone scrubbing processes prolong the residence time of the coal dust airflow within the double cyclone cylinder 20, effectively purifying the coal dust airflow and significantly improving dust removal efficiency.

[0043] Please refer to Figures 2 to 4 In this embodiment, the Venturi tube 11 includes a converging tube 111, a throat 112, and a diverging tube 113 connected in sequence. An air inlet 101 is located at the end of the converging tube 111 away from the throat 112, a liquid inlet 102 is located at the throat 112 near the converging tube 111, and an outlet 103 is located at the end of the diverging tube 113 away from the throat 112. The coal dust gas flow enters through the air inlet 101. As the pipe diameter gradually decreases, the flow cross-sectional area decreases, and the velocity of the coal dust gas flow increases significantly, forming a high-speed airflow. This high-speed airflow, upon entering the outer cylinder 21, enhances the swirling effect, achieving the first cyclone washing.

[0044] Furthermore, the swirling mixing assembly 12 includes a mixing cross plate 121, which is disposed in the throat 112 and located downstream of the air inlet 101 and the liquid inlet 102. The mixing cross plate 121 is used to perform a primary turbulent mixing of the fluid. When the coal dust airflow and water mist droplets flow through the mixing cross plate 121, intense turbulence occurs, generating strong vortices. The coal dust airflow and water mist droplets undergo intense turbulence and mixing, resulting in more uniform diffusion and faster and more thorough mixing. Moreover, the water mist mixes with the fine coal dust particles in the coal dust airflow to form larger particles, increasing the particle size and mass of the coal dust particles, facilitating subsequent separation.

[0045] Specifically, the mixing cross plate 121 includes two baffles 1211, which are arranged crosswise along the axial direction of the throat 112 to achieve the mixing effect of water mist and coal dust airflow.

[0046] Optionally, the spoiler 1211 has a fan-shaped structure, with its arc surface fitting against the inner wall of the throat 112 and the planes intersecting to form a hybrid cross plate 121.

[0047] Preferably, multiple mixing cross plates 121 are provided, and the multiple mixing cross plates 121 are sequentially arranged in the throat pipe 112. The multiple mixing cross plates 121 are staggered along the circumference of the throat pipe 112, so that the positions of the flow outlets of each mixing cross plate 121 are different, thereby further improving the mixing effect of water mist and coal dust airflow.

[0048] Furthermore, the swirl mixing assembly 12 includes multiple cutting heads 122, which are distributed on the inner wall of the throat 112 and located downstream of the air inlet 101 and the liquid inlet 102. The cutting heads 122 are used to perform secondary turbulence mixing on the mixed fluid. When the coal dust airflow and water mist droplets flow through the cutting heads 122, the airflow is strongly turbulent, improving the mixing efficiency of the water mist and coal dust airflow. At the same time, it can effectively crush the larger particles into micro-particle groups, preventing the agglomeration of larger particles and thus avoiding the clogging of the Venturi tube 11.

[0049] Specifically, the cutting head 122 includes a connecting part 1221 and a head 1222. One end of the connecting part 1221 is connected to the inner wall of the throat 112, and the head 1222 is disposed at the other end of the connecting part 1221, so that multiple turbulence structures appear on the inner wall of the throat 112, which enhances the mixing of coal dust airflow and water mist droplets, effectively prevents the accumulation of extra-large particles formed in the front section of the throat 112, and avoids the blockage of the Venturi tube 11.

[0050] Optionally, the connecting part 1221 is a cylindrical structure and the cutting head 122 is ellipsoidal. The two are connected to form an arched structure, which can significantly enhance airflow disturbance, strengthen the mixing of coal dust airflow and water mist droplets, and effectively prevent the accumulation of large particles in the front section of the throat 112, thus avoiding blockage of the Venturi tube 11.

[0051] Of course, the swirling mixing assembly 12 may also include other structures for turbulence and increased mixing, which are not specifically limited here.

[0052] Please refer to Figure 1 , Figure 2 and Figure 5 In this embodiment, within the double cyclone cylinder 20, a first tangential air inlet 211 is provided on the upper part of the circumferential sidewall of the outer cylinder 21. The first tangential air inlet 211 is connected to the outlet 103 of the gas-liquid mixer 10. The high-speed coal dust airflow flowing out of the outlet 103 of the gas-liquid mixer 10 is tangentially injected into the interior of the outer cylinder 21. Under the action of centrifugal force, the coal dust airflow quickly adheres to and covers the entire inner wall of the outer cylinder 21. The inner wall of the outer cylinder 21 includes the inner wall surface of the outer cylinder 21 and the outer wall surface of the inner cylinder 22, forming a uniform, continuous downward spiral rotating airflow, which is captured by the water film formed inside the outer cylinder 21. The coal dust airflow is tangentially injected from the upper part of the outer cylinder 21, and the main direction of the airflow rotation is downward, while the water film also flows downward, forming a downstream flow.

[0053] Furthermore, a second tangential air inlet 221 is provided at the lower part of the circumferential sidewall of the inner cylinder 22. The second tangential air inlet 221 is used to connect the outer cylinder 21 and the inner cylinder 22. The coal dust airflow, which has been preliminarily purified by the outer cylinder 21, enters the inner cylinder 22 through the second tangential air inlet 221 at the lower part of the inner cylinder 22, generating a high-speed, strongly wall-adhering, swirling upward airflow. This violently throws the wetted but not yet captured or agglomerated particles in the coal dust airflow toward the inner wall of the inner cylinder 22, where they are instantly captured and condensed by the water film on the inner cylinder 22 wall surface, and then discharged downward with the water film. In this configuration, the coal dust airflow enters from the tangential air inlet at the lower sidewall of the inner cylinder 22, and the main direction of the coal dust airflow rotation is upward, while the water film flows downward, forming a countercurrent flow.

[0054] By tangentially introducing the coal dust airflow through the outer cylinder 21 and the inner cylinder 22, a swirling effect is achieved. At the same time, the upper part of the outer cylinder 21 and the lower part of the inner cylinder 22 cut into the airflow, which also increases the dust removal time of the coal dust airflow between the cylinders, thereby improving the dust removal effect.

[0055] Specifically, both the inner cylinder 22 and the outer cylinder 21 are cylindrical at the top and conical at the bottom. This design promotes centrifugal separation, optimizes the distribution of the water film, and improves dust removal efficiency.

[0056] Because the gas-liquid mixer 10 can mix the coal dust airflow with the water flow to form a high-speed airflow, which enters the outer cylinder 21 through the first tangential air inlet 211, a strong swirling and centrifugal effect is achieved within the outer cylinder 21. Meanwhile, the velocity of the coal dust airflow entering the inner cylinder 22 decreases. Therefore, the inner cylinder 22 is further equipped with a negative pressure induced draft fan, located at the exhaust port 202. The negative pressure induced draft fan is used to form a cyclone coal dust airflow within the inner cylinder 22. The negative pressure induced draft fan is the main power source for the swirling flow in the inner cylinder 22. The coal dust airflow, which has been initially purified by the outer cylinder 21, enters the inner cylinder 22 through the second tangential air inlet 221 on the lower side wall of the inner cylinder 22 under the action of the negative pressure induced draft fan at the exhaust port 202. The internal swirling centrifugal force generated by the negative pressure induced draft fan violently throws the wetted but not yet captured or agglomerated particles in the coal dust airflow toward the wall of the inner cylinder 22. The particles are instantly captured and condensed by the water film on the wall of the inner cylinder 22 and discharged downward with the water film.

[0057] Optionally, a water-blocking device is also provided at the exhaust port 202 to prevent the gas after dust removal from carrying a large amount of moisture. It should be noted that the water-blocking device can be a water-blocking plate, a flow-rectifying blade, etc., all of which can achieve the function of blocking water and exhausting gas.

[0058] Because the diameter of the inner cylinder 22 is significantly smaller than that of the outer cylinder 21, although the negative pressure fan enables the airflow to achieve a high tangential inlet velocity, a swirling flow guide assembly is further installed inside the inner cylinder 22 to ensure the generation of a high-intensity rotating airflow within the limited space of the inner cylinder 22, thereby achieving forced guidance of the airflow within the inner cylinder 22. Through the synergistic effect of the negative pressure fan and the swirling flow guide assembly, a high-intensity rotating airflow can be ensured to be generated within the limited space of the inner cylinder 22.

[0059] Specifically, the swirling guide assembly includes a swirling fan 31, which is disposed in the inner cylinder 22 and located above the second tangential air inlet 221. The swirling fan 31 is used to enhance the swirling intensity of the swirling cleaning water flow in the inner cylinder 22, which significantly improves the swirling wall disturbance intensity of the coal dust airflow in the inner cylinder 22, and at the same time can prevent the coal dust airflow corridor formed in the inner cylinder 22 due to insufficient swirling intensity.

[0060] Specifically, the cyclone fan 31 includes a rotating shaft 311 and multiple blades 312. The rotating shaft 311 is disposed inside the inner cylinder 22 and connected to the corresponding inner wall or connecting shaft. The multiple blades 312 are evenly distributed on the outer periphery of the rotating shaft 311.

[0061] Of course, the vortex fan 31 can be connected to external motors or other structures via a connecting shaft or other built-in connecting wires, thereby enabling the vortex fan 31 to be turned on and off to form a forced vortex.

[0062] Furthermore, a first liquid inlet 212 is provided on the upper part of the circumferential sidewall of the outer cylinder 21, for the inflow of clean water into the outer cylinder 21; a second liquid inlet 222 is provided on the upper part of the circumferential sidewall of the inner cylinder 22, for the inflow of clean water into the inner cylinder 22. Through these liquid inlets, clean water flows into the corresponding outer cylinder 21 and inner cylinder 22 respectively. Then, under the action of swirling and centrifugation, the clean water forms a water film on the wall surfaces of the outer cylinder 21 and the inner cylinder 22, thereby achieving dust removal of coal dust particles. Specifically, the coal dust particles mix with the water film to form coal slurry water, which flows downwards along the water film to the drain outlet 201, achieving the discharge of the coal slurry water.

[0063] Specifically, the lower part of the outer cylinder 21 is connected to a first drain pipe 213, and the lower part of the inner cylinder 22 is connected to a second drain pipe 223. The bottoms of the two drain pipes are connected to form a drain outlet 201 to discharge coal slurry water.

[0064] Furthermore, the dual-cyclone Venturi water film dust collector used in the carbon capture system of the coal-fired power plant also includes a coal slurry pool 50, which is located at and connected to the sewage outlet 201 to collect coal slurry water.

[0065] Optionally, the coal slurry pond 50 is connected to a wastewater treatment system to treat the coal slurry water and reuse the water flow.

[0066] In order to supply water flow to the gas-liquid mixer 10 and clean water flow to the outer cylinder 21 and inner cylinder 22, in this embodiment, the dual cyclone venturi water film dust collector for the carbon capture system of a coal-fired power plant also includes a water supply system 40. The water supply system 40 is connected to the venturi tube 11, the outer cylinder 21 and the inner cylinder 22. The water supply system 40 is used to supply water flow to the venturi tube 11, the outer cylinder 21 and the inner cylinder 22, thereby realizing the supply of water flow.

[0067] Specifically, the water supply system 40 includes a water storage tank 41, a water supply pump 42, a main water pipe 43, a nozzle 44, a first water supply pipe 45, and a second water supply pipe 46. The main water pipe 43 is connected to the water storage tank 41, and the water supply pump 42 is connected to the main water pipe 43 to provide power for the flow of water. The two ends of the nozzle 44 are connected to the main water pipe 43 and the venturi tube 11, respectively. The nozzle 44 is configured to form a water mist in the form of a jet when the water is sprayed into the venturi tube 11. The two ends of the first water supply pipe 45 are connected to the main water pipe 43 and the outer cylinder 21, respectively, to supply clean water to the outer cylinder 21. The two ends of the second water supply pipe 46 are connected to the main water pipe 43 and the inner cylinder 22, respectively, to supply clean water to the inner cylinder 22.

[0068] Optionally, the water supply system 40 and the wastewater treatment system of the coal slime pond 50 work together, that is, the treated clean water in the wastewater treatment system is connected to the water storage pond 41 to realize the recycling of water flow, effectively reduce water consumption, avoid waste of water resources, truly realize "dust and water integration" control, effectively improve dust removal efficiency, improve atomization mixing effect, improve the economic and environmental benefits of enterprises, and reduce wastewater discharge.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A dual cyclone venturi water film dust collector for a coal fired power plant carbon capture system, characterized in that, include: The gas-liquid mixer (10) includes a venturi tube (11) and a swirl mixing assembly (12). The air inlet (101) of the venturi tube (11) is used for the inflow of coal dust gas in the carbon capture system of a coal-fired power plant, and the liquid inlet (102) of the venturi tube (11) is used to introduce water flow. The outlet (103) of the venturi tube (11) is used to discharge high-speed mixed gas flow. The swirl mixing assembly (12) is disposed inside the venturi tube (11) and is used to repeatedly agitate and mix the mixed fluid after gas-liquid mixing. The double cyclone cylinder (20) includes an outer cylinder (21) and an inner cylinder (22), which are connected. The outer cylinder (21) is connected to the outlet (103) of the gas-liquid mixer (10). Cyclone cleaning water flows in both the outer cylinder (21) and the inner cylinder (22) to mix with the dust in the mixed fluid to form coal slurry water. The bottom of the outer cylinder (21) and the bottom of the inner cylinder (22) are provided with drain ports (201) for discharging the coal slurry water. The top of the inner cylinder (22) is provided with an exhaust port (202) for the exhaust of the gas after dust removal. The upper part of the circumferential sidewall of the outer cylinder (21) is provided with a first tangential air port (211), which is connected to the outlet (103) of the gas-liquid mixer (10); the lower part of the circumferential sidewall of the inner cylinder (22) is provided with a second tangential air port (221), which is used to connect the outer cylinder (21) and the inner cylinder (22). The upper part of the circumferential sidewall of the outer cylinder (21) is provided with a first liquid inlet (212), which is used for the inflow of clean water into the outer cylinder (21); the upper part of the circumferential sidewall of the inner cylinder (22) is provided with a second liquid inlet (222), which is used for the inflow of clean water into the inner cylinder (22); A vortex guide assembly is disposed inside the inner cylinder (22). The vortex guide assembly is used to enhance the vortex intensity of the vortex cleaning water flow inside the inner cylinder (22). The swirling flow guide assembly includes a swirling fan (31), which is disposed in the inner cylinder (22) and located above the second tangential air inlet (221). The swirling fan (31) is used to enhance the swirling intensity of the swirling cleaning water flow in the inner cylinder (22).

2. The dual cyclone Venturi wet scrubber for carbon capture systems of coal-fired power plants of claim 1, wherein, The Venturi tube (11) includes a converging tube (111), a throat tube (112), and a diverging tube (113) connected in sequence. The air inlet (101) is located at the end of the converging tube (111) away from the throat tube (112). The liquid inlet (102) is located at the throat tube (112) near the converging tube (111). The outlet (103) is located at the end of the diverging tube (113) away from the throat tube (112).

3. The dual cyclone Venturi wet scrubber for carbon capture systems of coal-fired power plants according to claim 2, characterized in that, The swirling mixing assembly (12) includes a mixing cross plate (121), which is disposed in the throat (112) and located downstream of the air inlet (101) and the liquid inlet (102). The mixing cross plate (121) is used to perform a disturbance mixing on the mixed fluid.

4. The dual cyclone Venturi wet scrubber for carbon capture systems of coal-fired power plants of claim 2, wherein, The swirling mixing assembly (12) includes a plurality of cutting heads (122), which are distributed on the inner wall of the throat (112) and located downstream of the air inlet (101) and the liquid inlet (102). The cutting heads (122) are used to perform secondary agitation mixing on the mixed fluid.

5. The dual cyclone Venturi wet scrubber for carbon capture systems of coal-fired power plants according to any one of claims 1-4, characterized in that, The inner cylinder (22) is also provided with a negative pressure fan, which is located at the exhaust port (202). The negative pressure fan is used to make the clean water flow in the inner cylinder (22) form a cyclone clean water flow.

6. The dual cyclone Venturi wet scrubber for carbon capture systems of coal-fired power plants according to any one of claims 1-4, characterized in that, It also includes a water supply system (40) connected to the Venturi tube (11), the outer cylinder (21) and the inner cylinder (22), the water supply system (40) being used to supply water to the Venturi tube (11), the outer cylinder (21) and the inner cylinder (22).

7. The dual-cyclone Venturi water film dust collector for a coal-fired power plant carbon capture system according to claim 6, characterized in that, The water supply system (40) includes a water storage tank (41), a water supply pump (42), a main water pipe (43), a nozzle (44), a first water supply pipe (45), and a second water supply pipe (46). The main water pipe (43) is connected to the water storage tank (41), and the water supply pump (42) is connected to the main water pipe (43). The two ends of the nozzle (44) are connected to the main water pipe (43) and the Venturi tube (11), respectively. The two ends of the first water supply pipe (45) are connected to the main water pipe (43) and the outer cylinder (21), respectively. The two ends of the second water supply pipe (46) are connected to the main water pipe (43) and the inner cylinder (22), respectively.

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