An electrostatic-blade coupled demisting device and method

Abstract

This invention relates to an electrostatic-blade coupled demisting device and method, comprising a housing with an air inlet at one end and an air outlet at the other end. Multiple parallel blades are arranged inside the housing, each blade having multiple folding structures. An upper baffle is located at the top of each blade, and a lower baffle is located at the bottom. An air duct is formed between adjacent blades and their corresponding upper and lower baffles. The lower baffle has a guide channel for receiving liquid flowing down the blade surface. Drainage holes are located at both ends of the guide channel, which is connected to a dust hopper at the bottom of the housing via the drainage holes. Multiple electrode wires are arranged within the air duct, connected to a power source to apply an electric field force towards the blades to the liquid droplets within the air duct. The demisting device of this invention has good demisting effect, occupies little space, and has low pressure drop.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas turbine intake filtration, in particular to an electrostatic-vane coupled demisting device and method. BACKGROUND

[0002] The statements herein are merely provided to give background of the present application and are not necessarily prior art.

[0003] A gas turbine intakes a large amount of ambient air during operation. Therefore, the quality of the air entering the gas turbine is an important factor in determining the performance and life of the gas turbine. A filtration system controls the air quality by removing harmful substances in the air. A successful operation of the gas turbine requires an effective intake filtration system to protect it from harmful liquid droplets in the ambient air. In particular, gas turbines operating in marine environments face the challenge of salt-containing liquid droplets in the intake air. These liquid droplets can cause problems such as erosion, fouling and corrosion of the compressor and turbine, ultimately seriously affecting the safety and economy of the gas turbine.

[0004] Currently, the main gas turbine intake demisters used include vane demisters, wire mesh demisters and vane-wire mesh-vane three-stage demisters. However, the vane demister has very low separation efficiency for salt-containing liquid droplets with a diameter less than 10 microns. The wire mesh demister has the serious disadvantage of low critical airflow velocity for secondary liquid droplet carrying. The mainstream vane-wire mesh-vane three-stage demister, although relying on the series arrangement of the two demisters, achieves the purpose of separating liquid droplets with a diameter less than 5 microns in the airflow, but at the cost of increased demister area and increased airflow inlet and outlet pressure drop. Higher pressure drop increases the energy consumption of the demisting system and even affects the safe operation of the gas turbine. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide an electrostatic-vane coupled demisting device and method, which has a small area, a small airflow inlet and outlet pressure drop, and good separation effect for small liquid droplets.

[0006] In order to achieve the above-mentioned purpose, the present application is realized by the following technical solutions:

[0007] In a first aspect, embodiments of the present application provide a static-vane coupling demisting device, comprising a housing, the housing being provided with an air inlet at one end and an air outlet at the other end, the housing being internally provided with a plurality of parallel vane structures, the vane structure being provided with a plurality of deflection structures, the vane structure being provided with an upper baffle at the top end and a lower baffle at the bottom end, the adjacent vane structures and the corresponding upper and lower baffles forming an air duct, the lower baffle being provided with a flow guide groove for receiving the liquid flowing down the surface of the vane structure, the flow guide groove being provided with a flow discharge hole at both ends, the flow guide groove being communicated with a hopper provided at the bottom of the housing through the flow discharge hole, a plurality of electrode wires being provided in the air duct, the electrode wires being connected with a power supply to apply an electric field force to the liquid droplets in the air duct.

[0008] Optionally, the plurality of electrode wires are distributed along the gas flow direction in the air duct, and the electrode wires are arranged in parallel with the vane structure.

[0009] Optionally, the vane structure comprises a first vane portion, a second vane portion, a third vane portion, a fourth vane portion and a fifth vane portion arranged in sequence, wherein the first vane portion, the third vane portion and the fifth vane portion are parallel to each other, the first vane portion and the fifth vane portion are located on the same side of the third vane portion, the second vane portion is arranged at a set obtuse angle with the first vane portion and the third vane portion to form a deflection structure, and the fourth vane portion is arranged at a set obtuse angle with the third vane portion and the fifth vane portion to form a deflection structure.

[0010] Optionally, the degree of the set obtuse angle is 120°-150°.

[0011] Optionally, the number of electrode wires in the corresponding air duct part of the second vane portion and the fourth vane portion is greater than the number of electrode wires in the remaining part of the air duct.

[0012] Optionally, the upper baffle and the lower baffle are each provided with a plurality of fixing grooves, an upper support member passes through and is fixed in the corresponding fixing groove of the upper baffle of all vane structures, the both ends of the upper support member are fixed with the housing, a lower support member passes through and is fixed in the corresponding fixing groove of the lower baffle of all vane structures, and the both ends of the lower support member are fixed with the housing.

[0013] Optionally, an upper fixing member is arranged between the upper baffles of adjacent vane structures, the upper fixing member has a set distance from the top shell wall of the housing, an upper joint of the electrode wire is fixed with the upper fixing member, a lower fixing member is arranged between the lower baffles of adjacent vane structures, the lower fixing member has a set distance from the top open end of the hopper, and a lower joint of the electrode wire is fixed with the lower fixing member.

[0014] Optionally, the hopper adopts an inverted conical funnel structure, a drain port is arranged at the center position of the bottom of the hopper, and a valve is arranged at the drain port.

[0015] Optionally, the bottom groove surface of the flow guide groove is an inclined surface inclined from the middle part to both ends to guide the liquid to the flow discharge holes on both sides.

[0016] Secondly, embodiments of the present invention provide a method for the electrostatic-blade coupled demisting device described in the first aspect: airflow flows from the inlet end to the outlet end of the air duct. Due to the multiple deflection structures of the blades, during the flow of airflow, some droplets in the airflow collide with the blades due to inertia and are separated. At the same time, the electrode wires in the flow duct are energized, generating an electric field force towards the blades on the droplets. Some tiny droplets that cannot collide with the blades due to inertia flow through multiple electrode wires in sequence, and the electric field force they receive gradually increases, and their trajectory gradually deviates towards the blades. Finally, they collide with the blades and are separated. The liquid on the blade surface flows along the blade surface to the guide groove, flows into the ash hopper through the drain hole, and is discharged.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The electrostatic-blade coupled demister of the present invention, due to the multiple folding structures of the blades, enables droplets to collide with the blades and thus separate the droplets. By setting multiple electrode wires in the air duct, an electric field force towards the blades can be applied to the droplets, realizing the integration of the electrostatic field into the blade demister. Coupled with the electrostatic field on the basis of the blade demister structure, the last two stages of the blade-wire mesh-blade three-stage demister are eliminated, greatly reducing the size of the demister and minimizing the pressure loss of the airflow. In particular, an additional electric field is applied to the tiny droplets in the airflow, realizing the separation of tiny droplets without increasing the pressure loss of the demister, thereby reducing the energy consumption of the demister and helping to maintain the stable operation of the compressor.

[0019] 2. The electrostatic-blade coupled demister of the present invention can increase or decrease the operating voltage according to the actual air intake volume required, thereby increasing the droplet separation efficiency and reducing operating costs. The demister has a simple, compact and reasonable structure, and effectively solves the problems of low separation efficiency and high pressure loss of small droplets that are easy to occur in the existing marine gas turbine intake demister during use. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the outer shell in Embodiment 1 of the present invention;

[0023] Figure 3 This is a schematic diagram of the air duct formed by assembling the blades, upper baffle, and lower baffle in Embodiment 1 of the present invention.

[0024] Figure 4 This is a schematic diagram of the blade structure in Embodiment 1 of the present invention;

[0025] Figure 5 This is a schematic diagram of the guide channel arrangement in Embodiment 1 of the present invention;

[0026] Figure 6 This is a schematic diagram of the windshield structure in Embodiment 1 of the present invention;

[0027] Among them, 1. outer shell, 2. air inlet hood, 3. air inlet pipe, 4. air outlet hood, 5. air outlet pipe, 6. ash hopper, 7. drain outlet, 8. blade, 8-1. first blade section, 8-2. second blade section, 8-3. third blade section, 8-4. fourth blade section, 8-5. fifth blade section, 9. upper baffle plate, 10. lower baffle plate, 11. upper support bar, 12. lower support bar, 13. electrode wire, 14. upper connector, 15. upper fixing piece, 16. guide groove, 17. drain hole. Detailed Implementation

[0028] For ease of description, the words "upper" and "lower" appearing in this invention only indicate that they are consistent with the upper and lower directions of the accompanying drawings and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component 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.

[0029] Example 1

[0030] This embodiment provides an electrostatic-blade coupled demisting device, such as... Figures 1-3 As shown, it includes a housing 1, one end of which serves as an air inlet and is provided with an air inlet. The air inlet area covers the air inlets of all air ducts inside the housing. The other end of the housing 1 serves as an air outlet and is provided with an air outlet. The air outlet area covers the air outlets of all air ducts inside the housing.

[0031] The outer shell is a cuboid structure; in some other embodiments, the outer shell may also be a cube or cylinder structure.

[0032] An air intake hood 2 is provided at the air intake. The air intake hood 2 is a conical hood coaxially arranged with the air intake. Its larger end is fixed to the outer side of the shell wall of the outer shell 1 where the air intake is located, and its smaller end is connected to the air intake pipe 3.

[0033] An air hood 4 is provided at the air outlet. The air hood 4 is a conical hood coaxial with the air outlet. Its larger end is fixed to the outer side of the shell wall of the outer shell 1 where the air outlet is located, and its smaller end is connected to an air outlet pipe 5.

[0034] The bottom of the outer shell 1 is provided with an ash hopper 6. The ash hopper 6 adopts an inverted conical funnel structure with a top area larger than the bottom area. A drain outlet 7 is provided at the center of the bottom of the ash hopper 6 for discharging the separated liquid. A valve is provided at the drain outlet 7 for controlling the opening and closing of the drain outlet. Existing valves can be used, such as ball valves or butterfly valves, which will not be described in detail here.

[0035] The outer shell 1 has multiple blades 8 arranged inside, with the blades 8 arranged in parallel and the blades 7 arranged perpendicular to the top shell wall of the outer shell 1.

[0036] One end of the blade 8 extends to the plane of the inner side of the air inlet end shell wall of the outer casing 1, and the other end extends to the plane of the inner side of the air outlet end shell wall of the outer casing 1.

[0037] The blade 8 has an upper wind deflector 9 at its top and a lower wind deflector 10 at its bottom. The combination of the upper wind deflector 9 and the lower wind deflector 10 of adjacent blades 8 forms an air duct.

[0038] The air inlets of multiple air ducts are all located within the air inlet coverage area, and the air outlets of multiple air ducts are all located within the air outlet coverage area.

[0039] The blade 8 has multiple folding structures so that, as the airflow flows within the duct, the droplets can collide with the blade due to inertia and be separated.

[0040] In this embodiment, as Figure 4 As shown, the blade 8 includes a first blade section 8-1, a second blade section 8-2, a third blade section 8-3, a fourth blade section 8-4, and a fifth blade section 8-5 arranged sequentially from the air inlet end to the air outlet end.

[0041] The first blade section 8-1, the third blade section 8-3, and the fifth blade section 8-5 are arranged in parallel and perpendicular to the air inlet end shell wall and the air outlet end shell wall of the outer casing 1.

[0042] The first blade section 8-1 and the fifth blade section 8-5 are located on the same side of the plane where the third blade section 8-3 is located, and are arranged flush with each other.

[0043] The second blade section 8-2 is set at a set obtuse angle with the first blade section 8-1 and the third blade section 8-3. The set obtuse angle is 120°-150°, and those skilled in the art can set it according to actual needs.

[0044] The fourth blade section 8-4 is set at a set obtuse angle with the third blade section 8-3 and the fifth blade section 8-5. The set obtuse angle is 120°-150°, and those skilled in the art can set it according to actual needs.

[0045] The upper wind deflector 9 has a shape that matches the shape of the blade 8 and is perpendicular to the blade 8. The lower wind deflector 10 has a shape that matches the shape of the blade 8 and is perpendicular to the blade 8. The upper wind deflector 9 and the lower wind deflector 10 corresponding to the same blade 8 have the same shape and size.

[0046] In this embodiment, the blade 8 has two folding structures to form a trapezoidal structure. In other embodiments, the blade may also adopt a wavy structure, multiple trapezoidal structures, multi-channel streamlined structure, or multi-channel zigzag structure.

[0047] The top of all blades 8 is fixed to the outer casing 1 by multiple upper supports, and the bottom of all blades 8 is fixed to the outer casing 1 by multiple lower supports.

[0048] The upper support member is an upper support strip 11, which is made of insulating material, preferably phenolic plastic. The lower support member is a lower support strip 12, which is made of insulating material, preferably phenolic plastic.

[0049] In this embodiment, the top ends of all blades 8 are fixed to the outer shell 1 by three upper support bars 11, and the bottom ends of all blades 8 are fixed to the outer shell by three lower support bars 12.

[0050] One of the upper support bars 11 is located on the top surface of the first blade section 8-1 of the blade, another upper support bar 11 is located at the middle of the top surface of the third blade section 8-3 of the blade 8, and the third upper support bar 11 is located on the top surface of the fifth blade section 8-5.

[0051] Specifically, the upper wind deflector 9 of the blade 8 is provided with a fixing groove. The number and position of the fixing groove match the number and position of the upper support member. After the upper support bar 11 passes through the corresponding fixing groove of all blades 8, its two ends are fixed to the inner side of the two side shell walls opposite to the outer shell 1.

[0052] The top surface of the upper support bar 11 is attached to the bottom surface of the fixing groove and fixed by multiple bolts. The side surface of the upper support bar 11 is attached to the side surface of the fixing groove, and the top surface of the blade 8 is attached to the bottom surface of the upper support bar 11.

[0053] The lower support bar 12 is positioned corresponding to the upper support bar 11, with the lower support bar 12 positioned directly below the corresponding upper support bar 11.

[0054] The lower baffle plate 10 of the blade 8 is provided with a fixing groove corresponding to the lower support bar 12. After the lower support bar 12 passes through the corresponding fixing groove of the lower baffle plate 10 of all blades 8, its two ends are respectively fixed to the inner surfaces of the two oppositely arranged side shell walls of the outer shell 1.

[0055] The lower support bar 12 is attached to the bottom groove surface of the fixing groove and fixed by multiple bolts. The side of the lower support bar 12 is attached to the side groove surface of the fixing groove, and the bottom surface of the blade 8 is attached to the top surface of the lower support bar 12.

[0056] Multiple electrode wires 13 are installed within the air duct. The electrode wires 13 are cylindrical and have a diameter of 0.5mm-2.5mm. In other embodiments, the electrode wires 13 are barbed, star-shaped, serrated, or herringbone-shaped, etc.

[0057] Multiple electrode lines 13 are arranged along the flow direction of the airflow in the duct.

[0058] In this embodiment, the area between the first blade portion 8-1 of adjacent blades is defined as the first region, the area between the second blade portion 8-2 is defined as the second region, the area between the third blade portion 8-3 is defined as the third region, the area between the fourth blade portion 8-4 is defined as the fourth region, and the area between the fifth blade portion 8-5 is defined as the fifth region.

[0059] The number of electrode lines 13 in the second and fourth regions is greater than the number of electrode lines in the first, third, and fifth regions. Preferably, there are two electrode lines 13 in the second and fourth regions, and one electrode line 13 in the first, third, and fifth regions.

[0060] The electrode line 13 is located on the center surface of the flow channel, that is, the distance between the electrode line 13 and the blades 8 on both sides is equal.

[0061] The top end of the electrode wire 13 is connected to an upper connector 14, which is fixed to an upper fixing member 15 disposed between the upper baffle plates 9 of adjacent blades. The bottom end of the electrode wire 13 is connected to a lower connector, which is fixed to a lower fixing member disposed between the lower baffle plates 10 of adjacent blades.

[0062] The upper fixing member 15 adopts a strip structure that matches the blade 8 and is made of insulating material such as phenolic plastic. The upper fixing member 15 is fixed to the top surface of all the upper support strips 11. One end of the upper fixing member 15 extends to the top surface of the upper support strip 11 of the first blade portion 8-1 of the blade 8, and the other end of the upper fixing member 15 extends to the top surface of the upper support strip 11 of the fifth blade portion 8-5 of the blade.

[0063] The lower fixing member has the same structure as the upper fixing member 15. It also adopts a strip structure that matches the shape of the blade and is made of insulating material, such as phenolic plastic. The lower fixing member is located on the bottom surface of the three lower support strips 12. One end of the lower fixing member extends to the bottom surface of the lower support strip 12 corresponding to the first blade part 8-1, and the other end extends to the lower support strip 12 of the fifth blade part 8-5.

[0064] The lower baffle plate 10 of adjacent blades 8 has a flange on the part corresponding to the lower fixing member. The flange fits with the lower fixing member to achieve air duct sealing. The remaining parts of the edges of the two lower baffle plates 10 fit together to achieve sealing.

[0065] One side edge of the upper baffle plate 9 on adjacent blades 8 is provided with a flange, which fits against the upper fixing member 15 to achieve a seal on the air duct. The remaining parts of the edges of the two upper baffle plates 9 are fitted together to achieve a seal.

[0066] The upper bolt on the upper connector 14 has its shank passing through the upper support bar 11 of the upper fixing member 15 and tightened with a fixing nut. The fixing nut presses against the upper support bar 11 to fix the upper bolt. The remaining upper bolts pass through the upper fixing member and are then tightened with fixing nuts. The fixing nuts press against the bottom surface of the upper fixing member 15 to fix the upper bolt. The head of the upper bolt is pressed against the upper surface of the upper fixing member 15 for connection to a power source via a wire. The power source can be an existing DC high-voltage power source capable of outputting 30-50kV voltage, which will not be described in detail here. The shank of the upper bolt is threaded with a connecting nut, which is fixedly connected to the top end of the electrode wire.

[0067] The lower connector uses lower bolts. The shanks of the lower bolts located at both ends of the lower fixing member pass through the lower fixing member and the corresponding lower support bar 12 and are then tightened with fixing nuts. The fixing nuts press against the top surface of the lower support bar 12 to fix the upper bolts. The remaining lower bolts pass through the lower fixing member and are then tightened with fixing nuts. The fixing nuts press against the top surface of the lower fixing member to fix the lower bolts. The heads of the lower bolts are pressed against the bottom surface of the lower fixing member. The lower bolts are not connected to any other components. The shanks of the lower bolts are threaded with connecting nuts, which are fixedly connected to the bottom end of the electrode wire.

[0068] In this embodiment, the upper fixing member 15 is at a set distance from the top shell wall of the outer shell 1 to reserve space for wiring between the upper connector 14 and the wire, so as to facilitate wiring. The lower fixing member is at a set distance from the top of the ash hopper 6 to reserve space for wiring between the lower connector and the wire, so as to facilitate wiring.

[0069] like Figures 5-6 As shown, a guide groove 16 is provided on the lower baffle plate 10 corresponding to each blade 8. The guide groove 16 is located close to the blade 8 corresponding to the lower baffle plate 10 and is used to receive the liquid flowing down the surface of the blade 8.

[0070] The two ends of the guide groove 16 extend to the inner side of the shell wall of the outer shell 1 where the air inlet and air outlet are respectively opened.

[0071] The two ends of the guide channel 16 are provided with drainage holes 17, which connect the internal space of the guide channel 16 with the internal space of the ash hopper 6. Preferably, in order to facilitate the discharge of liquid inside the guide channel 16 through the drainage holes 17, the upper surface of the guide channel 16 is an inclined surface that slopes from the center to both ends, so that the liquid inside the guide channel 16 flows to the drainage holes 17 under its own gravity.

[0072] Example 2

[0073] This embodiment provides a method for the electrostatic-blade coupled demisting device described in Embodiment 1:

[0074] The upper connector of electrode wire 13 is connected to a DC high-voltage power supply via a wire, and blade 8 is grounded via a wire. In this embodiment, the blade is grounded by connecting the wire to a metal cylinder welded to its surface, or the wire is directly pasted and fixed to the blade surface. Airflow containing a large number of salt droplets enters the flow channel inside the housing 1 through the air inlet. The airflow direction is deflected by 30°-60° in the second region of blade 8, while large droplets with a diameter of not less than 10 micrometers in the airflow maintain their DC motion direction unchanged in the first region due to the inertial force and directly collide with blade 8 in the second region and are separated; smaller droplets with a diameter of less than 10 micrometers and not less than 5 micrometers that do not collide with blade 8 continue to flow with the airflow. The airflow enters the third region of the flow channel. Near the blades, the airflow is deflected, creating a backflow zone. Some smaller droplets are entrained in this backflow zone and separated by the blades 8. The unseparated droplets enter the fourth region of the flow channel with the airflow. In the fourth region, the airflow direction changes again by 30° to 60°. Some droplets are separated by impacting the blades 8 in the fourth region due to inertial force. The airflow then enters the fifth region of the flow channel, and the direction of movement changes back to direct current. The fifth region is located at the end of the flow channel, where the droplet separation effect is poor. The tiny droplets with a diameter of less than 5 micrometers in the airflow have small mass and are less affected by inertial force. They have a strong ability to follow the airflow and are difficult to separate by inertial impact mechanism.

[0075] Electrode wires 13, fixed in the flow channel, are subjected to a sufficiently high voltage via a DC power supply, causing corona discharge. The air in the airflow is ionized, generating a large number of high-energy free electrons and positive and negative ions. Under the influence of the electric field, the free electrons and negative ions move towards the blade 8. Droplets in the airflow collide with negative ions due to field-induced charging caused by the electric field and diffusion charging caused by thermal diffusion of ions. Eventually, the droplets become negatively charged. The charged droplets are then driven towards the blade 8 by an electric field perpendicular to the flow channel direction. Droplets in the airflow are rapidly charged near electrode wires 13 in the first region of the flow channel. Under the influence of the electric field, charged droplets with a diameter of not less than 5 micrometers directly collide with the blade. The tiny droplets, with a charged diameter of less than 5 micrometers, are separated from the blade 8. Their trajectories gradually deviate from the center of the flow channel. Each time they pass an electrode line 13, the accumulated charge of the droplet increases, and the electric field force on the droplet becomes stronger, causing the tiny droplet to become more and more biased towards the blade 8. The tiny droplets enter the second region of the flow channel with the airflow. In the second region, the droplets are subjected to the combined effects of inertial force and electrostatic force, and their trajectory quickly deviates towards the blade 8, realizing the coupling effect between the blade 8 and electrostatics. The electric fields in the third, fourth, and fifth regions of the flow channel mainly exert an electric field force on the charged droplets, further enhancing the separation effect of the electrostatic-blade coupling demisting device on the tiny droplets, until the tiny droplets collide with the blade 8 and are separated.

[0076] The liquid on the surface of blade 8 falls along the surface of blade 8 to the guide groove 16 under its own gravity. Then, under the guidance of the guide groove 16, it enters the ash hopper 6 through the drain hole 17 and is then discharged. Because the drain hole 17 is covered by the liquid in the guide groove 16, there is no air leakage, and gas will not flow out through the drain hole 17.

[0077] The demisting device and method of this embodiment integrates the electrostatic field into the existing blade demister structure, making full use of the area between the blades. It eliminates the last two stages of blades and the wire mesh in the existing three-stage blade-wire-blade demister, shortening the length of the demisting device, reducing pressure loss at the airflow inlet and outlet, and greatly improving the separation efficiency of tiny droplets. In the second and fourth regions of the flow channel, droplets move towards the wall facing the airflow direction due to inertial force, and are simultaneously strengthened by the electric field force, accelerating their wall-movement. Since the electric fields on both sides of electrode line 13 are in opposite directions, the droplets on both sides are charged. Since the field forces act in opposite directions, a large number of droplets can also be separated on the side wall that is not directly facing the airflow direction, making the electrostatic enhancement effect more obvious. This achieves the coupling between electrostatics and blade 8. This device simplifies the process of the existing marine gas turbine intake filtration system. The operating voltage can be increased or decreased according to the actual intake volume requirements, which can increase the droplet separation efficiency or reduce the operating cost. The demister in this embodiment has a simple, compact and reasonable structure, which effectively solves the problems of low separation efficiency and high pressure loss of small droplets that are easy to occur in the existing marine gas turbine intake demister during use, and helps to maintain the stable operation of the compressor.

[0078] Meanwhile, the flow channels formed between the blades in this embodiment avoid the processing difficulties and large pressure losses caused by structures such as barbs.

[0079] In a numerical model test of the device in this embodiment, the blade spacing is 12cm, the turning angle is 45°, the number of electrode lines is X=1 in the first region, Y=2 in the second region, Z=1 in the third region, M=2 in the fourth region, and K=1 in the fifth region, the electrode line radius is 0.5mm, the voltage is 50kV, the airflow inlet velocity is 4m / s, and the mass flow rate of the droplets in the airflow is 0.03325kg / s. At this time, the electrostatic-blade coupled demister has a separation efficiency of 89% for droplets with a diameter of 2 micrometers and a separation efficiency of 100% for droplets with a diameter of 3 micrometers. Moreover, the pressure drop at the airflow inlet and outlet is only 18.5 Pa, which is a significant improvement over the performance of the existing blade-electrostatic-blade three-stage composite demister. At this time, the length of the trapezoidal blade is 1.8 meters, which is significantly reduced compared to the space occupied by the existing demister.

[0080] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electrostatic-vane coupling mist eliminator characterized by, The shell is internally provided with a plurality of parallel arranged blades, the blade has a plurality of folding structures, the top end of the blade is provided with an upper wind baffle, the bottom end is provided with a lower wind baffle, the adjacent blades and the corresponding upper and lower wind baffles form an air duct, the lower wind baffle is provided with a flow guide groove for receiving the liquid flowing down the surface of the blade, both ends of the flow guide groove are provided with a flow hole, the flow guide groove is communicated with the ash bucket arranged at the bottom of the shell through the flow hole, a plurality of electrode wires are arranged in the air duct, the electrode wires are connected with the power supply to apply an electric field force to the liquid droplets in the flow channel towards the blade; The blade includes a first blade part, a second blade part, a third blade part, a fourth blade part and a fifth blade part arranged in sequence, wherein the first blade part, the third blade part and the fifth blade part are parallel to each other, the first blade part and the fifth blade part are on the same side of the third blade part, the second blade part is arranged at a set obtuse angle with the first blade part and the third blade part to form a folding structure, and the fourth blade part is arranged at a set obtuse angle with the third blade part and the fifth blade part to form a folding structure. The number of electrode wires in the part of the air duct corresponding to the second blade part and the fourth blade part is more than the number of electrode wires in the rest of the air duct.

2. An electrostatic vane coupling mist eliminator as claimed in claim 1, wherein, A plurality of electrode wires are distributed along the gas flow direction in the air duct, and the electrode wires are arranged parallel to the blades.

3. An electrostatic vane coupling mist eliminator as claimed in claim 1, wherein, The set obtuse angle is 120°-150°.

4. An electrostatic-coupled mist eliminator as defined in claim 1 wherein, The upper wind baffle and the lower wind baffle are both provided with a plurality of fixing grooves, the corresponding fixing grooves of the upper wind baffles of all the blades pass through the upper support and are fixed with the upper support, the two ends of the upper support are fixed with the shell, the corresponding fixing grooves of the lower wind baffles of all the blades pass through the lower support and are fixed with the lower support, and the two ends of the lower support are fixed with the shell.

5. An electrostatic vane coupling mist eliminator as claimed in claim 1, wherein, An upper fixing member is arranged between the upper wind baffles of adjacent blades, the upper fixing member has a set distance from the top shell wall of the shell, the upper joint of the electrode wire is fixed with the upper fixing member, and a lower fixing member is arranged between the lower wind baffles of adjacent blades, the lower fixing member has a set distance from the top open end of the ash bucket, and the lower joint of the electrode wire is fixed with the lower fixing member.

6. An electrostatic-coupled mist eliminator as defined in claim 1 wherein, The ash bucket adopts an inverted conical funnel structure, a drain port is arranged at the center of the bottom of the ash bucket, and a valve is arranged at the drain port.

7. An electrostatic vane coupling mist eliminator as claimed in claim 1 wherein, The bottom groove surface of the flow guide groove is an inclined surface inclined from the middle to both ends to guide the liquid to the flow holes on both sides.

8. A method of electrostatic-vane coupling mist eliminator according to any one of claims 1 to 7, characterized in that, The gas flows from the air inlet end to the air outlet end of the air duct. Due to the plurality of folding structures of the blade, part of the liquid droplets in the gas flow are separated due to the impact with the blade during the flow process. At the same time, the electrode wires in the flow channel are electrified to generate an electric field force towards the blade on the liquid droplets. Part of the small liquid droplets that cannot collide with the blade due to inertia gradually increase the electric field force and gradually deviate the motion trajectory towards the blade after flowing through a plurality of electrode wires in sequence, and finally collide with the blade to be separated. The liquid on the surface of the blade flows along the surface of the blade to the flow guide groove, flows into the ash bucket through the flow hole and is discharged.

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