Ship exhaust gas treatment device

Abstract

This invention provides a ship exhaust gas treatment device, which includes a reaction tower and, from bottom to top, a cooling spray layer, a turbulence layer, a spray layer, and a demisting layer arranged within the reaction tower. The reaction tower has a flue gas inlet at its bottom and a flue gas outlet at its top. At least one turbulence device is arranged within the turbulence layer, which thoroughly mixes the desulfurization solution sprayed from the spray layer with the cooled flue gas. This exhaust gas treatment device integrates all reaction layers into a single reaction tower, reducing the operating resistance of the desulfurization tower, decreasing its volume, lowering investment costs, and improving desulfurization efficiency through the arrangement of turbulence and spray.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental protection treatment equipment, and in particular to a ship exhaust gas treatment device. Background Art

[0002] With the increase in the number of ships worldwide, the increasingly serious environmental and ecological problems caused by ship exhaust, especially the impact of sulfur oxides (SOx) in emissions from the combustion of high-sulfur fuels on the environment, have attracted close attention from maritime administrations and environmental protection departments in various countries.

[0003] In order to ensure that the ship's exhaust gas meets the emission standards, the ship's exhaust gas needs to be desulfurized by the treatment device before it can be discharged. The current ship exhaust desulfurization technologies mainly include seawater desulfurization-open loop, alkaline solution desulfurization (usually sodium hydroxide solution)-closed loop and other technologies. The main forms of desulfurization towers are spray tower washing, packed bed washing, Venturi washing and other methods. However, in the existing exhaust gas washing devices and methods, the desulfurization tower has a large operating resistance, low desulfurization efficiency, large volume, large investment cost and occupied space, and limited scope of application of working conditions. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the above-mentioned problems, and this purpose is achieved through the following technical solutions.

[0005] The present invention provides a ship exhaust gas treatment device, comprising a reaction tower, and a cooling spray layer, a turbulent layer, a spray layer and a demisting layer arranged in the reaction tower from bottom to top;

[0006] The bottom of the reaction tower is provided with a smoke inlet, and the top of the reaction tower is provided with a smoke outlet;

[0007] A spray pipeline connected to the slurry buffer tank is arranged in the cooling spray layer, and a plurality of cooling nozzles are arranged in the spray pipeline in the direction toward the bottom of the reaction tower, and the solution sprayed by the cooling nozzle forms convection with the flue gas in the reaction tower;

[0008] At least one turbulent device is arranged in the turbulent layer, and the turbulent device fully mixes the desulfurization solution sprayed from the spray layer with the cooled flue gas;

[0009] A spray pipeline connected to the slurry buffer tank is arranged in the spray layer, and a plurality of nozzles are arranged in the spray pipeline in the direction toward the bottom of the reaction tower, and the solution sprayed from the nozzle forms convection with the flue gas in the reaction tower;

[0010] At least one group of tube bundle type demisters is arranged in the demister layer.

[0011] During operation, the flue gas to be treated enters the reaction tower through the flue gas inlet at the bottom of the device; after the high-temperature flue gas to be treated (>220 degrees Celsius) enters, it is first washed and cooled by the cooling spray layer, and then enters the turbulent layer. In the turbulent layer, the flue gas and the desulfurization solution are strongly mixed through the turbulent device to achieve efficient heat and mass transfer between the flue gas and the solution. The flue gas temperature reaches a saturated state, and then after two layers of spraying, the SOx and particulate matter in the flue gas are fully removed; then the flue gas enters the dust removal and mist removal layer to remove the droplets and some small-sized particles carried by the flue gas. Finally, the treated clean flue gas is discharged through the flue gas outlet at the top, and the spray solution is collected at the bottom of the reaction tower under the action of gravity and discharged by gravity into the slurry buffer tank. In this way, the tail gas treatment device integrates each reaction layer into a reaction tower, reduces the operating resistance of the desulfurization tower, reduces the volume of the desulfurization tower, reduces the investment cost, and improves the desulfurization efficiency through the setting of turbulence and spraying.

[0012] Furthermore, the cooling spray layer is 1-2 layers, and when the cooling spray layer is two layers, the two cooling spray layers are arranged at intervals along the height direction of the reaction tower.

[0013] Further, the turbulence device comprises a cylindrical support frame installed on the inner wall of the reaction tower, a central tube arranged concentrically with the cylindrical support frame, and at least one layer of turbulence blades installed in the cylindrical support frame;

[0014] There are a plurality of turbulent blades in the same layer, and each of the turbulent blades is evenly distributed along the circumference of the central tube;

[0015] The inner end of each turbulent blade is mounted on the cylinder wall of the central cylinder, and the outer end thereof is mounted on the cylinder wall of the cylindrical support frame.

[0016] Furthermore, the turbulence blades are single-layered, and each of the turbulence blades forms a preset angle with the flow direction of the exhaust gas.

[0017] Furthermore, each of the turbulent blades is installed between the cylindrical support frame and the central tube through a first angle adjustment mechanism.

[0018] Further, the first angle adjustment mechanism includes a first active part and a first driven part, the first active part is mounted on one of the cylindrical support frame and the central tube, and the first driven part is mounted on the other of the two;

[0019] The first active part includes a motor and an active connecting rod drivingly connected to the motor, the active connecting rod is fixedly connected to the turbulent blade, and the first driven part includes a sliding bearing and a driven connecting rod installed on the inner ring of the sliding bearing, the driven connecting rod is fixedly connected to the turbulent blade.

[0020] Furthermore, the turbulence device further comprises a transfer tube disposed between the cylindrical support frame and the central tube, the turbulence blades comprise inner blades and outer blades, the inner blades are mounted between the central tube and the transfer tube, and the outer blades are disposed between the transfer tube and the cylindrical support frame;

[0021] Each of the inner blades and each of the outer blades forms a preset angle with the flow direction of the exhaust gas.

[0022] Furthermore, each of the outer blades is installed between the cylindrical support frame and the adapter tube through a second angle adjustment mechanism.

[0023] Furthermore, the second angle adjustment mechanism includes a second active part and a second driven part, the second active part is mounted on one of the cylindrical support frame and the adapter cylinder, and the second driven part is mounted on the other of the two;

[0024] The second active part includes a driving motor and a transmission rod connected to the driving motor, the transmission rod is fixed to the outer blades, and the second driven part includes a connecting bearing and a follower rod installed on the inner ring of the connecting bearing, the follower rod is fixed to the outer blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of a specific implementation of the ship exhaust gas treatment device provided by the present invention;

[0027] Figure 2 for Figure 1 The schematic diagram of the structure of the turbulence device with single-layer blades in the ship exhaust gas treatment device shown;

[0028] Figure 3 for Figure 1 A schematic structural diagram of a turbulent device with double-layer blades in a ship exhaust gas treatment device is shown.

[0029] Description of reference numerals:

[0030] 100-Reaction Tower

[0031] 101-Cooling spray layer

[0032] 102-Turbulence Layer

[0033] 103-Spraying layer

[0034] 104-Dust and mist removal layer

[0035] 105-Flue gas inlet

[0036] 106-Smoke outlet

[0037] 1- Turbulence device

[0038] 11-Cylindrical support frame

[0039] 12-Center tube

[0040] 13-Turbulence Blades

[0041] 131-Inner blade 132-Outer blade

[0042] 14-Adapter

[0043] 15-Middle sealing plate DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Please refer to Figure 1 , Figure 1 This is a schematic structural diagram of a specific implementation of the ship exhaust gas treatment device provided by the present invention.

[0046] In a specific embodiment, the ship exhaust gas treatment device provided by the present invention is suitable for both open-loop seawater desulfurization process and closed-loop alkaline solution desulfurization process. The exhaust gas treatment device includes a reaction tower 100, and a cooling spray layer 101, a turbulent layer 102, a spray layer 103 and a dust removal and demisting layer 104 arranged in the reaction tower 100 from bottom to top. According to the use requirements, the spray layer 103 can be 1-2 layers, and one or more turbulent devices 1 can be arranged in the turbulent layer 102. The number of turbulent devices 1 is determined according to the turbulence requirements and the caliber of the reaction tower 100. At the same time, according to the sulfur content in the exhaust gas, the spray layer 103 can be set to 1-2 layers, or even more layers.

[0047] Among them, a flue gas inlet 105 is opened at the bottom of the reaction tower 100, and a flue gas outlet 106 is opened at the top; a cooling pipeline connected to the slurry buffer tank is arranged in the cooling spray layer 101, and a plurality of cooling nozzles are arranged in the direction of the cooling pipeline toward the bottom of the reaction tower 100, and the coolant sprayed from the cooling nozzle forms convection with the flue gas in the reaction tower 100; at least one turbulent device 1 is arranged in the turbulent layer 102, and the turbulent device 1 stirs and mixes the absorption solution sprayed from the spray layer 103 with the cooled flue gas; a spray pipeline connected to the slurry buffer tank is arranged in the spray layer 103, and a plurality of nozzles are arranged in the direction of the spray pipeline toward the bottom of the reaction tower 100, and the absorption solution sprayed from the nozzle forms convection with the flue gas in the reaction tower 100; at least one dust removal and demisting device is arranged in the dust removal and demisting layer 104.

[0048] The above-mentioned slurry buffer tank is specifically a desulfurization solution storage tank. In addition to the above-mentioned structure, the tail gas treatment device also includes waste liquid centrifugal treatment equipment, desulfurization wastewater treatment equipment and induced draft fan, etc. The above-mentioned flue gas inlet is connected to the exhaust pipe of the ship diesel engine, the flue gas outlet is discharged into the atmosphere, the washing liquid outlet returns to the slurry buffer tank, and the circulating slurry pipeline inlet is connected to the circulating pump.

[0049] During operation, the high-temperature flue gas (>220 degrees Celsius) to be treated enters the reaction tower 100 through the flue gas inlet 105 at the bottom of the device; first, it is washed and cooled by the cooling spray layer 101, and then enters the turbulent layer 102. In the turbulent layer 102, the flue gas and the desulfurization solution are strongly mixed through the turbulent device 1 and the spray layer 103, so that the flue gas and the solution are efficiently transferred. Heat and mass transfer, the flue gas temperature reaches a saturated state, and SOx and particulate matter in the flue gas are fully removed; the flue gas after the desulfurization reaction enters the dust removal and mist removal layer 104 to remove the droplets and part of the particulate matter entrained in the flue gas. Finally, the treated clean flue gas is discharged through the flue gas outlet at the top; the spray solution is collected at the bottom of the reaction tower 100 and flows out to return to the slurry buffer tank. In this way, the tail gas treatment device integrates each reaction layer into a reaction tower 100, reduces the operation resistance of the desulfurization tower, reduces the volume of the desulfurization tower, reduces the investment cost, and improves the desulfurization efficiency through the turbulence and spray settings.

[0050] Specifically, the cooling spray layer 101 is 1-2 layers, and when the cooling spray layer 101 is two layers, the two cooling spray layers 101 are arranged at intervals along the height direction of the reaction tower 100 so as to fully cool the flue gas.

[0051] The turbulence blades 13 of the above-mentioned turbulence device 1 can be arranged in two ways, one is to set up two layers of inner and outer blades, the inner blades are set to be fixed, and the outer blades are set to be adjustable, and the blade angle is adjustable; the other is to set up only one layer of blades, and the blade angle is adjustable. The blade angle adjustment adopts a circumferential linkage device to adjust the angle of the blade by the horizontal movement of the connecting rod. The blade angle of the turbulence device 1 is adjustable, which increases the means of adjusting the flue gas resistance and desulfurization efficiency, so that the reaction tower 100 can also obtain a high desulfurization efficiency at partial load and reduce the system energy consumption. The angle of the adjustable turbulence blade 13 can be adjusted according to the SOx concentration at the outlet of the washing tower, the resistance of the washing tower, etc., and the resistance of the reaction tower 100 can be reduced as much as possible while meeting the desulfurization requirements, so as to achieve the economical operation of the desulfurization device.

[0052] When a single-layer blade turbulence device 1 is used, the number of turbulence blades 13 is set to 8 to 30, and the inclination angle of the blades is 20 to 55 degrees; when two layers of turbulence blades 13 are set, the ratio of the diameter of the inner blade 131 to the diameter of the turbulence device 1 is between 0.1 and 0.7.

[0053] A plug may be provided in the center of the central tube 12 of the turbulence device 1 to enhance the turbulence effect. The ratio of the diameter of the plug to the diameter of the turbulence device 1 is between 0.1 and 0.5.

[0054] Specifically, Figure 2 As shown, when the turbulence device 1 is in the form of a single-layer blade, the turbulence device 1 includes a cylindrical support frame 11 installed on the inner wall of the reaction tower 100, a central tube 12 concentrically arranged with the cylindrical support frame 11, and at least one layer of turbulence blades 13 installed in the cylindrical support frame 11; there are multiple turbulence blades 13 in the same layer, and each turbulence blade 13 is evenly distributed along the circumference of the central tube 12; the inner end of each turbulence blade 13 is installed on the wall of the central tube 12, and the outer end thereof is installed on the wall of the cylindrical support frame 11.

[0055] When the turbulent blades 13 are single-layer, each of the turbulent blades 13 forms a preset angle with the flow direction of the exhaust gas, and each of the turbulent blades 13 is installed between the cylindrical support frame 11 and the central tube 12 through a first angle adjustment mechanism. The first angle adjustment mechanism includes a first active part and a first driven part, the first active part is installed on one of the cylindrical support frame 11 and the central tube 12, and the first driven part is installed on the other of the two; the first active part includes a motor and an active connecting rod connected to the motor in a transmission manner, the active connecting rod is fixed to the turbulent blade 13, and the first driven part includes a sliding bearing and a driven connecting rod installed on the inner ring of the sliding bearing, and the driven connecting rod is fixed to the turbulent blade 13.

[0056] When the turbulent blade 13 is a double-layer structure, Figure 3 As shown, the turbulence device 1 also includes a transfer tube 14 disposed between the cylindrical support frame 11 and the central tube 12, and the turbulence blades 13 include inner blades 131 and outer blades 132, wherein the inner blades 131 are installed between the central tube 12 and the transfer tube 14, and the outer blades 132 are arranged between the transfer tube 14 and the cylindrical support frame 11; each of the inner blades 131 and each of the outer blades 132 forms a preset angle with the flow direction of the exhaust gas. Each of the outer blades 132 is installed between the cylindrical support frame 11 and the transfer tube 14 through a second angle adjustment mechanism. The second angle adjustment mechanism includes a second active part and a second driven part, the second active part is installed on one of the cylindrical support frame 11 and the adapter tube 14, and the second driven part is installed on the other of the two; the second active part includes a driving motor and a transmission rod connected to the driving motor, the transmission rod is fixed to the outer blade 132, and the second driven part includes a connecting bearing and a follower rod installed on the inner ring of the connecting bearing, and the follower rod is fixed to the outer blade 132.

[0057] In actual working process, when the amount of flue gas to be treated is large, a turbulence device 1 with a larger diameter is used. At this time, the turbulence device is provided with two layers of inner and outer blades, the inner blade 131 is fixed, and the outer blade 132 is designed to be adjustable, and the blade angle is adjusted by an external connecting rod. When the amount of flue gas to be treated is small, a turbulence device with a small diameter is used. At this time, the turbulence device is provided with only one set of blades, and the blades are designed to be adjustable, and the blade angle is also adjusted by an external connecting rod. The center of the turbulence device 1 is a plug, and the blades of the turbulence device 1 are between 8 and 30. The number of turbulence devices 1 can be selected according to the amount of flue gas and the diameter of the turbulence unit. When the flue gas flow is small and the diameter of the selected turbulence unit is large, one can be selected; when the flue gas flow is large and the diameter of the selected turbulence unit is small, multiple can be used. The flue gas flow rate of the turbulence unit can be selected from 3 to 10 m / s.

[0058] In summary, the present invention adopts a new type of internal structure design of the reaction tower 100. After the flue gas enters the reaction tower 100, it enters the turbulent device to form a vortex after being sprayed and cooled, and is violently mixed with the desulfurization solution. The gas and liquid are fully mixed and contacted here, which greatly improves the heat transfer and mass transfer efficiency between the gas and liquid. The blade angle in the turbulent device 1 is adjustable, which increases the means of adjusting the flue gas resistance and desulfurization efficiency, so that the reaction tower 100 can also obtain a high desulfurization efficiency at partial load and reduce the system energy consumption; the angle of the adjustable turbulent blade 13 can be adjusted according to the SOx concentration at the outlet of the reaction tower 100, the resistance of the reaction tower 100, etc., and the resistance of the reaction tower 100 is reduced as much as possible under the premise of meeting the desulfurization requirements, so as to achieve the economic operation of the desulfurization device.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A ship exhaust gas treatment device, characterized in that: It comprises a reaction tower (100), and a cooling spray layer (101), a turbulent layer (102), a spray layer (103), and a dust removal and demisting layer (104) which are sequentially arranged in the reaction tower (100) from bottom to top; The reaction tower (100) has a smoke inlet (105) at the bottom and a smoke outlet (106) at the top; A spray pipeline connected to the slurry buffer tank is arranged in the cooling spray layer (101), and a plurality of cooling nozzles are arranged in the spray pipeline in a direction toward the bottom of the reaction tower (100), and the solution sprayed from the cooling nozzle forms convection with the flue gas in the reaction tower (100); At least one turbulence device (1) is arranged in the turbulence layer (102), and the turbulence device (1) mixes the desulfurization solution sprayed from the spray layer (103) with the flue gas from below, and reduces the temperature of the flue gas to the saturation temperature; The turbulence device (1) further comprises a cylindrical support frame (11) mounted on the inner wall of the reaction tower (100), a central cylinder (12) arranged concentrically with the cylindrical support frame (11), and at least one layer of turbulence blades (13) mounted in the cylindrical support frame (11); There are a plurality of turbulent blades (13) in the same layer, and the turbulent blades (13) are evenly distributed along the circumference of the central tube (12); The inner end of each turbulent blade (13) is mounted on the wall of the central tube (12), and the outer end thereof is mounted on the wall of the cylindrical support frame (11); The turbulence device (1) further comprises a transition tube (14) arranged between the cylindrical support frame (11) and the central tube (12); the turbulence blades (13) comprise inner blades (131) and outer blades (132); the inner blades (131) are installed between the central tube (12) and the transition tube (14); and the outer blades (132) are arranged between the transition tube (14) and the cylindrical support frame (11); Each of the inner blades (131) and each of the outer blades (132) forms a preset angle with the flow direction of the smoke; Each of the outer blades (132) is installed between the cylindrical support frame (11) and the adapter cylinder (14) via a second angle adjustment mechanism; The second angle adjustment mechanism comprises a second active part and a second driven part, the second active part is mounted on one of the cylindrical support frame (11) and the adapter cylinder (14), and the second driven part is mounted on the other of the two; The second active part comprises a driving motor and a transmission rod connected to the driving motor, the transmission rod being fixedly connected to the outer blade (132); the second driven part comprises a connecting bearing and a follower rod mounted on the inner ring of the connecting bearing, the follower rod being fixedly connected to the outer blade (132); A spray pipeline connected to a slurry buffer tank is arranged in the spray layer (103), a plurality of nozzles are arranged in the spray pipeline in a direction toward the bottom of the reaction tower (100), and the solution sprayed from the nozzles forms convection with the smoke in the reaction tower (100); At least one layer of tube bundle type dust and mist remover is arranged in the dust and mist removal layer (104).

2. The ship exhaust gas treatment device according to claim 1, characterized in that: The number of the cooling spray layers (101) is 1-2, and when the number of the cooling spray layers (101) is two, the two cooling spray layers (101) are arranged at intervals along the height direction of the reaction tower (100).

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