Dust reduction system including soot discharged from large ship engine

Abstract

The present invention is characterized by comprising: an exhaust pipe for guiding exhaust gas discharged from an engine including a marine engine; a cyclone separator that can be branched from the discharge pipe and coupled to a dust reduction pipe including a blower, and that reduces the dust concentration in the exhaust gas to a set value or less by collecting dust including soot included in the exhaust gas by means of fine droplets sprayed from a spray nozzle; and a mist main device for supplying high-pressure water to the mist spray nozzle provided inside the cyclone separator. To this end, according to the present invention, the present invention can provide a dust reduction system comprising soot discharged from a large ship engine, according to the present invention, it is possible to stably and effectively remove dust including incomplete combustion soot included in high-temperature exhaust gas generated in particular during initial operation of a large ship engine and soot generated during operation until normal operation, and thus it is possible to stably maintain the back pressure of gas discharged from the large ship engine.

Description

Technical Field

[0001] The present invention relates to a dust reduction system including carbon smoke exhausted from a large ship engine, and more particularly, to a dust reduction system including carbon smoke exhausted from a large ship engine, wherein the structure is improved in a manner capable of spraying fine mist so as to reduce a large amount of soot generated due to incomplete combustion during the initial operation of the ship engine and dust in the exhaust gas generated during normal operation. Background Art

[0002] As public attention to air pollution increases, governments around the world are also gradually strengthening regulation of dust, including fine dust, emitted into the atmosphere. Although regulation of fine dust emitted from cars has been strengthened, regulation of ships is relatively weak. Because ships sail on the ocean, the severity of dust emitted from ships is less severe than that of cars.

[0003] However, starting from 2020, the International Maritime Organization (IMO) has strengthened its supervision of pollutant emissions from ships over 30,000 tons. After that, the IMO's supervision of air pollutant emissions is expected to become more stringent.

[0004] On the other hand, for port cities such as Busan and Incheon, most of the dust problems are caused by ships, not cars. In other words, the dust problems caused by ships actually have a great impact on the dust problems in the ocean and on land.

[0005] In this regard, as governments and the International Maritime Organization realize the seriousness of fine dust emitted from ships, regulations are expected to become increasingly strict. Therefore, the development of technology to capture dust including soot emitted from ships is becoming a very important issue.

[0006] When a large ship engine is running, a large amount of dust including soot is discharged, especially when the load rate is below 30%. When the engine load rate is gradually increased from 30% to 100%, no soot is generated. In other words, a large amount of soot is discharged during the initial operation, which is the main cause of air pollution.

[0007] There is currently no method for capturing soot generated when the engine is at a low load. For example, attempts have been made to capture dust including soot from large marine engines using a DPF (disel particulate filter) dust collector installed in the exhaust gas pipe of a car to capture dust discharged from the car engine. In addition, a proposal has been made to install a filter in the exhaust gas pipe of a marine engine to capture dust.

[0008] However, the dust discharged from the ship engine has strong viscosity, small particle size, and long particle shape, so when the dust adheres to the filter of the particle filter, it does not fall off easily. In addition, the dust adheres to the filter and increases the color of the filter, thereby weakening the function of the particle filter. That is, the impurities attached and fixed to the filter reduce the function of the filter or the particle filter, thereby reducing the efficiency of the particle filter and may also shorten the life of the particle filter.

[0009] For this reason, soot from ship engines cannot be captured by particulate filters or filters. As an alternative, a scrubber method that uses water to capture dust is used to remove dust from the exhaust gas of large ship engines. In the case of this scrubber method, it is impossible to capture fine carbon black particles because the size of the water droplets sprayed from the scrubber is large, so the adhesion to smaller particles is reduced, making it difficult to capture fine dust.

[0010] That is, in the case of a particulate filter, the particulate filter is damaged due to the viscosity of soot, and in the case of a scrubber, the size of the carbon black particles in the particles is small and cannot be combined with the water droplet particles sprayed from the scrubber, so the dust capture rate is reduced.

[0011] Related technical literature

[0012] Korean Patent Gazette No. 10-2015060 (published on August 27, 2019)

[0013] Korean Patent Publication No. 10-2018-0076918 (published on July 6, 2018) Summary of the invention

[0014] Technical issues

[0015] Therefore, an object of the present invention is to provide a dust reduction system for carbon soot exhausted from a large ship engine, which can stably and effectively remove dust including incompletely burned soot included in the high-temperature exhaust gas generated especially during the initial operation of the large ship engine and soot generated during the operation process until normal operation.

[0016] Furthermore, another object of the present invention is to provide a dust reduction system including soot exhausted from a large ship engine, which can stably maintain the back pressure of the gas exhausted from the large ship engine.

[0017] Furthermore, another object of the present invention is to provide a dust reduction system including soot exhausted from a large ship engine, which can save the cost of maintaining and managing a system for removing dust included in the gas exhausted from a large ship engine, thereby improving economic efficiency.

[0018] Furthermore, another object of the present invention is to provide a dust reduction system including carbon smoke exhausted from a large ship engine, wherein a cooling section is provided upstream of a cyclone separator that sprays tiny liquids to prevent the tiny droplets from evaporating at high temperatures, thereby increasing the capture efficiency of dust including soot.

[0019] Another object of the present invention is to provide a dust reduction system including soot exhausted from a large ship engine, which can separate solids from captured matter captured at the bottom of a cyclone separator and can recycle liquid.

[0020] Furthermore, another object of the present invention is to provide a dust reduction system including soot exhausted from a large ship engine, which can increase the efficiency of the ship engine.

[0021] Furthermore, another object of the present invention is to provide a dust reduction system that can achieve zero emission including soot exhausted from large ship engines.

[0022] Another object of the present invention is to provide a dust reduction system for soot exhausted from a large ship engine, which can prevent the occurrence of white smoke by evaporating moisture in the exhaust gas exhausted by high-temperature exhaust gas exhausted from the engine.

[0023] Technical Solution

[0024] The object of the present invention is achieved by a dust reduction system, which is characterized in that it includes: an exhaust pipe for guiding exhaust gas discharged from an engine including a ship engine; a cyclone separator that can branch from the above-mentioned exhaust pipe and be combined with a dust reduction pipe including a blower, and capture dust including soot included in the exhaust gas by tiny droplets sprayed from a spray nozzle, thereby reducing the dust concentration in the exhaust gas to below a set value; and a mist main device for supplying high-pressure water to the above-mentioned spray nozzle arranged inside the above-mentioned cyclone separator.

[0025] Furthermore, it is preferred that the average size of the droplets sprayed from the spray nozzle is within a range of 20 to 80 μm.

[0026] Furthermore, preferably, when the engine load is 30% or less, the bulk density of the droplets ejected by the cyclone separator is between 500,000 and 20,000 / cm 3 within the range.

[0027] Furthermore, preferably, the air conditioner further comprises a cooling unit provided upstream of the cyclone separator and configured to reduce the temperature of the exhaust gas branched from the exhaust pipe.

[0028] Furthermore, preferably, before the engine is started, the control unit controls the air blower, the mist main device, and the cyclone separator so that they can operate under a no-load condition.

[0029] Furthermore, preferably, the cyclone separators are formed in plurality, and the control unit performs the following control to operate the engine to operate the plurality of cyclone separators to a set first load, and only the cyclone separator on the upstream side of the dust reduction pipe among the cyclone separators exceeds the first load and operates to a set second load.

[0030] Furthermore, preferably, when the second load is exceeded, the exhaust gas is discharged through the exhaust pipe.

[0031] And, preferably, it further comprises a solid-liquid separation section for collecting the captured matter captured at the lower part of the cyclone separator and separating it into solid and liquid.

[0032] On the other hand, the object of the present invention is achieved by a dust reduction system, which is characterized in that it includes: an exhaust pipe for guiding exhaust gas discharged from an engine including a ship engine; a cyclone separator that can branch from the above-mentioned exhaust pipe and be combined with a dust reduction pipe including a blower, and capture dust including soot included in the exhaust gas by tiny droplets sprayed from a spray nozzle, thereby reducing the dust concentration in the exhaust gas to below a set value; and a mist main device that supplies high-pressure water to the above-mentioned spray nozzle arranged inside the above-mentioned cyclone separator. The above-mentioned dust reduction system also includes a cooling part, which is arranged upstream of the above-mentioned cyclone separator and can be used to reduce the temperature of the exhaust gas branched from the above-mentioned exhaust pipe.

[0033] Furthermore, preferably, the cooling unit includes an auxiliary cooling member so that the pipe discharged from the engine and the pipe discharged from the cyclone separator can exchange heat with each other.

[0034] Furthermore, it is preferable that foreign matters or contaminants included in the contaminated water discharged from the lower portion of the cyclone separator be removed to clean the inside of the cyclone separator or the contaminated water be used as water supplied to the spray nozzle.

[0035] Furthermore, preferably, a chimney for discharging the gas to the atmosphere is formed downstream of the cyclone separator, and the chimney includes a discharge valve connecting the discharge pipe and the cyclone separator with the chimney, and the discharge valve opens when the engine is subjected to back pressure.

[0036] Effects of the Invention

[0037] In this regard, according to the present invention, a dust reduction system including carbon soot exhausted from a large ship engine can be provided, which can stably and effectively remove dust including incompletely burned carbon soot included in the high-temperature exhaust gas generated especially during the initial operation of the large ship engine and soot generated during the operation process until normal operation.

[0038] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can stably maintain the back pressure of the gas exhausted from the large ship engine.

[0039] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can save the cost of maintaining and managing a system for removing dust included in gas exhausted from a large ship engine, thereby improving economic efficiency.

[0040] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, wherein a cooling unit is provided upstream of a cyclone separator that sprays minute liquids to prevent minute droplets from evaporating at high temperatures, thereby increasing the capture efficiency of dust including soot.

[0041] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can separate solids from the collected matter collected at the lower part of the cyclone separator and can recycle liquid.

[0042] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can increase the efficiency of the ship engine.

[0043] Furthermore, the present invention can provide a dust reduction system that can achieve zero emission including soot exhausted from large ship engines.

[0044] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can prevent the generation of white smoke by evaporating moisture in the exhaust gas exhausted by high-temperature exhaust gas exhausted from the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 The figure is a piping flow chart for explaining a dust reduction system according to an embodiment of the present invention.

[0046] Figure 2 for Figure 1 Piping flow chart of the mist main device.

[0047] Figure 3a is a graph showing the size distribution of droplets sprayed from a mist master device.

[0048] Figure 3bA schematic diagram for explaining a double potential layer formed on the surface of dust including mist droplets and soot.

[0049] Figure 4 This is a graph for explaining the amount of dust generated due to the load of a ship engine.

[0050] Figure 5a to Figure 5d The following is a flow chart for explaining the operation process of the dust reduction system of the present invention.

[0051] Figure 6 It is a piping flow chart for describing a dust reduction system according to another embodiment of the present invention.

[0052] Figure 7 It is a piping flow chart for describing a dust reduction system according to another embodiment of the present invention.

[0053] Figure 8a and Figure 8b For illustration Figure 7 Flowchart of the working process. DETAILED DESCRIPTION

[0054] Reference Figures 1 to 8b A dust reduction system 1000 for carbon smoke exhausted from a large ship engine according to an embodiment of the present invention (hereinafter referred to as a "dust reduction system") is specifically described as follows.

[0055] Figure 1 This is a piping flow chart for illustrating a dust reduction system according to an embodiment of the present invention. Figure 2 for Figure 1 Piping flow chart of the mist master device, Figure 3a A graph showing the size distribution of droplets sprayed from a mist master device, Figure 3b is a schematic diagram for explaining a double potential layer formed on the surface of dust including mist droplets and soot, Figure 4 This is a graph for explaining the amount of dust generated by the load of a ship engine. Figure 5a to Figure 5d Flowchart for explaining the working process of the dust reduction system of the present invention. Figure 6 This is a piping flow chart for illustrating a dust reduction system according to another embodiment of the present invention. Figure 7 This is a piping flow chart for illustrating a dust reduction system according to another embodiment of the present invention. Figure 8a and Figure 8b For illustration Figure 7 Flowchart of the working process.

[0056] Before describing the present invention in more detail, the present invention may have various changes and may have various forms, and examples (aspects) (or embodiments) are described in detail in the present invention. However, this does not limit the present invention to a specific disclosed form, but should be understood to include all changes, equivalent technical solutions or alternative technical solutions included in the concept and description scope of the present invention.

[0057] In the drawings, the same reference numerals, in particular, reference numerals with the same tens and units digits or tens, units and letters, represent components with the same or similar functions, unless otherwise mentioned, and the components referred to by the reference numerals in the drawings are components that comply with such reference numerals.

[0058] Furthermore, in the drawings, the size or thickness of the structural elements is enlarged (or thickened) or reduced (or thinned), or simplified for ease of understanding, but the protection scope of the present invention is not limited thereto.

[0059] The terms used in this specification are only used to illustrate specific examples (aspects) (or embodiments), and are not used to limit the present invention. Unless clearly indicated in the context, singular expressions do not include plural expressions. In this application, terms such as "~including" or "formed by~" specify the existence of features, numbers, steps, actions, structural elements, components or combinations thereof recorded in the specification, and do not preclude the existence or additional possibility of one or more other features, numbers, steps, actions, structural elements, components or combinations thereof.

[0060] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. Terms defined in commonly used dictionaries have the same meaning as those in the context of the relevant technology and cannot be interpreted as ideal or excessive meanings unless clearly defined in their own right.

[0061] Preferably, if Figure 1 and Figure 2 As shown, a dust reduction system 1000 according to an embodiment of the present invention includes: an exhaust pipe 130 for guiding exhaust gas discharged from an engine 100 including a ship engine; a cyclone separator 1300, which can be branched from the above-mentioned exhaust pipe 130 and combined with a dust reduction pipe 1500 including a blower 1570, and captures dust including soot included in the exhaust gas by tiny droplets sprayed from a spray nozzle 1730, thereby reducing the dust concentration in the exhaust gas to below a set value; and a mist main device 1700, which supplies high-pressure water to the above-mentioned spray nozzle 1730 arranged inside the above-mentioned cyclone separator 1300.

[0062] Preferably, the dust reduction system 1000 further includes a cooling unit 1100 , a solid-liquid separation unit 1800 , and a control unit 1900 .

[0063] Preferably, in the present invention, the exhaust gas included in the exhaust pipe 130 includes gas passing through an engine and a turbo charger.

[0064] In the present invention, the engine 100 may include a variety of engines, which may include a large ship engine 100. For example, a ship engine having an engine power of 10MW (0.5MW×20) may be included. The engine 100 may also include an intake port 110 for sucking in air, fuel, etc., and an exhaust pipe 130 for exhausting the burned gas. Moreover, as needed, the dust reduction system 1000 may include: an air intake bypass 131, connected to the exhaust pipe 130 or the dust reduction pipe 1500, so that air can be sucked into the dust reduction pipe 1500 when the engine 100 is operated in a no-load state before operation; and an exhaust valve 133, which closes the exhaust pipe 130 so that the exhaust gas is directed to the dust reduction pipe 1500.

[0065] The cooling unit 1100 is provided at the upstream side of the dust reduction pipe 1500 to reduce the temperature of the exhaust gas flowing into the dust reduction pipe 1500. When the cooling unit 1100 does not reduce the temperature, the minute droplets sprayed from the spray nozzle 1730 evaporate due to the temperature of the exhaust gas, thereby reducing the possibility that the cyclone separator 1300 captures dust including soot present in the exhaust gas.

[0066] Generally, when the engine 100 is running, the exhaust gas temperature of the engine 100 is about 450 degrees, and the exhaust gas flowing from the exhaust pipe 130 into the dust reduction pipe 1500 has a temperature of about 220 degrees. Preferably, the cooling unit 1100 reduces the temperature of the exhaust gas of about 220 degrees to about 100 degrees.

[0067] The cooling part 1100 may include a heat exchanger method or a method of spraying water having a size greater than a droplet size sprayed toward the cyclone separator 1300 .

[0068] In the cyclone separator 1300 , fine liquid droplets are sprayed from the spray nozzle 1730 toward the exhaust gas passing through the cooling unit 1100 to capture dust including soot in the exhaust gas.

[0069] Preferably, the cyclone separator 1300 may be formed in plurality. The cyclone separator 1300 of one embodiment of the present invention includes a first cyclone separator 1330 disposed downstream of the cooling section 1100 along the dust reduction pipe 1500 and a second cyclone separator 1350 disposed downstream of the first cyclone separator 1330 .

[0070] A plurality of spray nozzles 1730 coupled to a high-pressure water supply pipe 1705 are disposed inside the cyclone separator 1300 . The high-pressure water supply pipe 1705 is connected to a high-pressure pump 1720 .

[0071] Preferably, the average size of droplets sprayed from such a spray nozzle 1730 is in the range of 20 to 80 μm.

[0072] Furthermore, preferably, when a large amount of dust including soot is generated from the engine due to incomplete combustion caused by a low engine load, for example, when the engine load is 30 to 50% or less, the accumulation density of droplets sprayed from the spray nozzle 1730 inside the cyclone separator 1300 is 500,000 to 20,000 / cm 3 within the range.

[0073] Figure 3a : is a graph showing the size distribution of the mist droplets, wherein the average particle size of the mist droplets is 25 μm.

[0074] When the size of the mist droplets is larger than the size of the dust including soot, the mist droplets stay in the air for a short time, making it difficult to attach to the dust particles including soot. When the mist droplets are larger, due to the influence of gravity, the possibility of attaching to the dust particles including soot in a suspended state is reduced. Only when the mist droplets and the dust particles including soot are suspended in the air together will they attach to each other, thereby increasing the possibility of sinking.

[0075] Therefore, preferably, the present invention particularly appropriately selects the spray nozzle 1730 to generate a large number of fine mist droplets per unit volume (increase the mist holding value), thereby effectively sinking the dust including the soot scattered from the cyclone separator 1300.

[0076] Although not shown in the figure, the mist droplets are mainly combined with dust including larger soot, so that the dust can sink together with the droplets.

[0077] Preferably, the higher the dust concentration, the smaller the size of the droplets and the higher the packing density. The smaller the size of the droplets, the greater the potential of the droplet surface, thereby increasing the efficiency of attaching droplets to dust particles. That is, the more droplets per unit volume and the higher the concentration, the higher the possibility of dust particles combining with droplets.

[0078] The average size of the droplets is smaller than that of dust including soot, and the bulk density is less than 100,000 / cm 3 When the dust is greater than 100,000 / cm 3 When the dust removal efficiency increases, more water than necessary will be used, but the dust removal efficiency will not increase accordingly.

[0079] The bulk density is measured by measuring the movement of droplets in the cyclone chamber using a high-speed camera (Model: K2 DistaMax, Long-Distance Microscope System), checking how many droplets exist in the measured volume, and calculating the number per unit volume by averaging the above-mentioned inspection values.

[0080] More specifically, refer to Figure 3b The description is as follows.

[0081] like Figure 3b As shown, two ion layers are formed on the surface of particles or droplets. The ion strength of the Stern layer, which is an ion layer strongly bound to the surface of the particle, is extremely high. In addition, a diffuser layer is formed on the periphery of the Stern layer. Although its strength is weaker than that of the Stern layer, a strong ion layer is still formed. These two layers are called a "double layer". A free layer is formed on the periphery of the double layer. The ion strength of this layer is weak and thus does not affect the binding of the particles. Through the double layer, particles and droplets are combined to remove examples in the air (this is called the "double layer effect"). That is, dust particles including soot discharged from large engines used in ships are removed by the double layer effect.

[0082] Among them, the Stern layer and the diffusion layer are formed due to the surface potential acting on the particle surface, that is, the double layer is formed by the action of the potential.

[0083] The size of the double layer ion strength is inversely proportional to the particle size. The smaller the particle size, the greater the double layer ion strength. The greater the ion strength, the greater the adhesion rate between the droplets and the particles, thereby increasing the particle capture rate.

[0084] In order to combine the mist droplets with the dust including soot, mist droplets of 10 to 20 μm in size are sprayed into the cyclone separator 1300, and the mist droplets swirl and combine with the dust particles including soot flowing into the cyclone separator 1300 through a double layer effect. The soot dust particles combined with the mist droplets become heavy and separate from the cyclone separator 1300, and the separated dust particles adhere to the wall surface of the cyclone separator 1300 and then fall to the lower part of the cyclone separator 1300 and are discharged.

[0085] Preferably, the dust reduction pipe 1500 includes: a cooling inlet pipe 1510, which branches off from the exhaust pipe 130 and flows into the cooling section 1100; a cooling exhaust pipe 1520, which passes through the cooling section 1100 and is located between the above-mentioned cooling section 1100 and the first cyclone separator 1330; a first cyclone separator exhaust pipe 1530, which is located between the first cyclone separator 1330 and the second cyclone separator 1350; and a second cyclone separator exhaust pipe 1550, which is discharged from the second cyclone separator 1350 and is connected to the exhaust pipe 130.

[0086] Moreover, preferably, the dust reduction pipe 1500 also includes: a first cyclone separator bypass pipe 1540, which is connected to the first cyclone separator exhaust pipe 1530 through the second cyclone separator exhaust pipe 1550 without passing through the second cyclone separator 1350; and a cyclone separator return pipe 1560 connected to the cooling inlet pipe 1510 or the cooling exhaust pipe 1520 in the second cyclone separator exhaust pipe 1550.

[0087] Preferably, although there is no valve on the dust reduction duct 1500 side branching from the exhaust duct 130 to the dust reduction duct 1500 , a valve may be provided as necessary.

[0088] Meanwhile, preferably, the dust reduction pipe 1500 includes: a first discharge valve 1533 for opening and closing the first cyclone separator discharge pipe 1530 ; a first bypass valve 1535 for opening and closing the first cyclone separator bypass pipe 1540 ; and a return valve 1563 for opening and closing the cyclone separator return pipe 1560 .

[0089] Moreover, if Figure 4 As shown, in the exhaust gas exhausted from the engine 100, dust including soot is intensively generated when the load of the engine 100 is within 30%, and dust including soot is hardly generated when the load of the engine 100 is more than 30%.

[0090] Due to this feature, until the set engine 100 load reaches 30%, the exhaust gas passes through the dust reduction system 1000 and removes dust including soot (refer to Figure 5b and Figure 5c ), when the load of the engine 100 is above 30%, the exhaust gas will not pass through the dust reduction system 1000, but will be discharged to the atmosphere through the exhaust pipe 130 (refer to Figure 5d ).

[0091] That is, the control unit 1900 can cause the first cyclone separator 1330 and the second cyclone separator 1350 to operate simultaneously according to the inspection results of the first sensor 1930 that detects the temperature, dust concentration, and humidity of the exhaust pipe 130 or the first load set according to the load of the engine 100 (for example, from the initial load of the engine 100 to 15% load).

[0092] Also, in a second load (eg, a load of the engine 100 greater than 15% and less than 30%) in which less soot and the like are generated than in the first load, the control portion 1900 may operate only the first cyclone separator 1330 .

[0093] Meanwhile, when the load is greater than the second load, for example, when the load of the engine 100 is greater than 30%, the control unit 1900 may prevent the dust reduction duct 1500 and the mist main device 1700 from operating.

[0094] In the control unit 1900 , a second sensor 1950 is included in an area connected to the exhaust pipe 130 downstream of the dust reduction pipe 1500 , so that the dust concentration, temperature, humidity, etc. of the exhaust gas passing through the dust reduction pipe 1500 can be detected and provided to the control unit 1900 .

[0095] Based on the second sensor 1950 , when the exhaust gas includes dust at a concentration higher than a set concentration, the return valve 1563 of the cyclone separator return pipe 1560 is opened so that the exhausted exhaust gas can be returned to the cyclone separator 1300 .

[0096] The dust reduction duct 1500 includes a blower 1570 for directing exhaust gas toward the exhaust duct 130 , and the blower 1570 is used to increase the back pressure of the engine 100 .

[0097] Preferably, the mist main device 1700 includes: a water tank 1710, which is used to store water supplied from a water supply pipe 1701; a high-pressure pump 1720, which pressurizes water on a pipe connected to the water tank 1710 through a set high pressure; a pump suction pipe 1703, which is connected to the water tank 1710 and is used to supply water to the high-pressure pump 1720; a high-pressure water supply pipe 1705, which guides the water pressurized in the high-pressure pump 1520 to a spray nozzle 1730 that sprays a plurality of tiny droplets; a valve (not shown), which is combined with a high-pressure water return pipe 1707, and the above-mentioned high-pressure water return pipe 1707 is combined with water and high-pressure water pipes (pipes) to supply water or high-pressure water or return it; and a valve (not shown), which discharges water on the pipe; and a check valve (not shown) to prevent the water on the pipe from flowing back.

[0098] And, if Figure 2 As shown, preferably, for example, the mist main device 1700 includes: a 1 μm filter for removing foreign matter present in water; and a high-pressure pump 1720 , which is a plunger type and can be used to supply a pressure of about 70 bar to the discharge piping and multiple spray nozzles 1730 .

[0099] The spray nozzle 1730 can be used with an aperture of 0.15 mm, 0.2 mm, 0.3 mm, or 0.5 mm as required. Preferably, even if the apertures are changed, the particle size distribution of the droplets sprayed to the spray nozzle 1730 by the high pressure pump 1720 is as follows: Figure 3a shown.

[0100] Moreover, as needed, the mist main device 1700 can suppress the occurrence of fire or inject medicine or unillustrated medicine for deodorization into the water tank 1710. In this case, the mist main device 1700 may also include an unillustrated medicine box for storing medicine and a medicine metering pump that can quantitatively supply the medicine in the medicine box into the water.

[0101] When a pressure higher than the set pressure occurs on the discharge side of the high-pressure pump 1720, the pressure is branched from the high-pressure water supply pipe 1705 and returned to the suction side through the high-pressure water return pipe 1707 in order to prevent the pressure higher than the set high pressure from being transmitted to the spray nozzle 1730, so that the high-pressure pump 1520 can operate within the set pressure range. When the injection volume is small, preferably, the rotation speed of the high-pressure pump 1520 changes with the set pressure. This control can be completed by the control unit 1900.

[0102] The solid-liquid separator 1800 is used to separate the captured material captured by the cyclone separator 1300 into solid and liquid. As an embodiment, preferably, the solid-liquid separator 1800 includes: a pressure pump (not shown) for applying pressure to the captured material; and a filter press, which captures solid components in the filter chamber space between the filter plate and the filter cloth combined with the filter plate through the pressure of the pressure pump and discharges the clear filtrate after the solid components are separated. Preferably, the clear filtrate is supplied to the water tank 1710 so that the high-pressure water sprayed from the spray nozzle 1730 can be recycled.

[0103] Reference Figure 5a to Figure 5d The working process of the dust reduction system 1000 having such a structure is specifically described as follows.

[0104] First, if Figure 5a As shown, before starting the engine 100, the dust reduction system 1000 is started. That is, the high-pressure pump 1720, the blower 1570, and the cooling unit 1100 are operated (if necessary, the spray nozzle 1730 may not spray high-pressure water). In this case, the engine 100 is not started, and since the exhaust gas is not discharged to the exhaust pipe 130, no air intake occurs. Therefore, if necessary, the dust reduction pipe 1500 or the exhaust pipe 130 is provided with an air intake bypass 131 that allows external air to flow in so that air can be taken in to the dust reduction pipe 1500, and the air intake bypass 131 can be opened.

[0105] In this case, the high-pressure water branch valve 1706 and the first discharge valve 1533 will be opened, and the first bypass valve 1535 and the return valve 1563 will be closed.

[0106] Then, if Figure 5b As shown, when the engine 100 is started and the load is slowly increased (for example, the engine load is about 0 to 15 (20)%), the exhaust valve 133 of the exhaust pipe 130 will be closed and the blower 1570 will work, so that the exhaust gas will be discharged to the outside through the exhaust pipe 130 along the dust reduction pipe 1500 and through the cyclone separator 1300 and the blower 1570.

[0107] Under such an initial load, the first cyclone separator 1330 and the second cyclone separator 1350 operate, and minute droplets are sprayed from the spray nozzle 1730 , thereby capturing dust including soot in the exhaust gas and dropping it to the lower side of the cyclone separator 1300 .

[0108] In this case, the high-pressure water branch valve 1706 and the first discharge valve 1533 will be opened, and the first bypass valve 1535 and the return valve 1563 will be closed.

[0109] Then, if Figure 5c As shown, when the engine 100 slowly increases its load (the engine load increases from 15 (20)% to 30 (50)%), the amount of dust including soot discharged from the engine 100 will decrease, and therefore, the operation of the second cyclone separator 1350 is stopped, and only the first cyclone separator 1330 is operated to supply only high-pressure water to the first cyclone separator 1330, so that the spray nozzle 1730 sprays tiny droplets.

[0110] In this case, the high-pressure water branch valve 1706 and the first discharge valve 1533 will be closed, the first bypass valve 1535 will be opened, and the return valve 1563 will be closed.

[0111] Moreover, if Figure 5d As shown, when the load of the engine 100 reaches a set range (for example, the engine load is above 30% or 50%), the amount of exhaust gas discharged from the engine 100 will be reduced, and the amount of dust including soot and the like will be below the allowable exhaust value. Therefore, the dust reduction system 1000 will not work, and the exhaust gas will be directly discharged to the outside through the exhaust pipe 130.

[0112] Figure 6 Another embodiment of a dust reduction system 2000 of the present invention is shown.

[0113] Different from the above embodiment, Figure 6 The dust reduction system 2000 has a cyclone separator 2300 .

[0114] Preferably, the cooling unit 2100 cools the intake air flowing into the cyclone separator 1300 by spraying water with large droplets from the spray nozzle supplied by the mist main device 1700 .

[0115] Moreover, the mist master device 1700 is the same.

[0116] Meanwhile, the droplet size and bulk density sprayed from the spray nozzle 2730 of the unillustrated cyclone separator 1300 are the same as those described above.

[0117] According to still another embodiment of the present invention having such a structure, a plurality of spray nozzles 2730 for spraying toward the cyclone separator 1300 are combined in two annular ducts.

[0118] That is, when there are many incomplete combustion phenomena at the beginning or when the engine is started in a cold state and dust including a lot of soot is discharged to the exhaust pipe 130, the control unit 1900 can control so that the spray nozzles 2730 combined with the two annular pipes spray droplets (open Figure 6 After that, only the spray nozzle 2730 combined in a ring pipe sprays droplets (closed Figure 6 Valve 2735).

[0119] In this embodiment, unexplained reference numerals are structures identical to the reference numerals for the hundreds digit unit, tens digit unit, and units digit unit in the above-mentioned embodiment, and perform the same functions.

[0120] A dust reduction system 5000 according to another embodiment of the present invention is as follows: Figures 7 to 8b shown.

[0121] The structure of the mist master device 5700 not described in this embodiment is the same as that described above, and therefore, it will not be described in detail below.

[0122] The function of the blower 5570 of the dust reduction system 5000 of this embodiment is the same as that described above, and it allows the exhaust gas discharged from the engine 100 to pass through the cyclone separator 5300 and be discharged to the outside through a stack.

[0123] The blower 5570 allows the exhaust gas from the engine 100 to be discharged more efficiently from the engine 100, and thus, the dust reduction system 5000 of the present invention is applied, and the efficiency is confirmed to be further improved compared to the conventional system that does not adopt the present invention. The engine efficiency can be improved by increasing the excess air volume.

[0124] Furthermore, in this embodiment, unlike the above description, the contaminated water that captures fine dust and the like in the cyclone separator 5300 and is discharged to the lower side of the cyclone separator 5300 passes through the contaminated water pipe 5400 including the contaminated water piping 5410, the circulation pipe 5600 and the mist main device 5700 to become clean water and is recycled, thereby realizing five discharges.

[0125] Furthermore, the cyclone separator discharge pipe 5550 that discharges clean air through the discharge pipe 130 discharged from the engine 100 and the chimney is provided with the discharge valve 133 described above, thereby solving the back pressure problem between the engine 100 and the cyclone separator 5300. The problem of back pressure generated in the engine 100 due to the possibility that air may be sucked into the discharge pipe 130 from the chimney can be solved.

[0126] Furthermore, the high-temperature exhaust pipe 130 discharged from the engine 100 can achieve heat exchange with the gas of the cyclone separator exhaust pipe 5550 at the front end of the blower 5570 through the auxiliary cooling unit 5130. Through this heat exchange, the air discharged to the chimney can be evaporated to prevent the white smoke phenomenon of the discharged gas, and at the same time, the effect of pre-cooling the high-temperature gas of the exhaust pipe 130 at the front end of the main cooling unit 5150 can be obtained.

[0127] However, the auxiliary cooling member 5130 may not be required, and as required, although not shown in the figure, the exhaust gas discharged from the engine 100 may flow directly into the main cooling member 5150 side without passing through the auxiliary cooling member 5130.

[0128] In the dust reduction system 5000 , exhaust gas exhausted from the engine 100 is cooled and guided to the cyclone separator 5300 using the cooling portion 5100 including the auxiliary cooling part 5130 or the main cooling part 5150 .

[0129] The temperature of the exhaust gas (or exhaust gas) discharged from the high-temperature engine 100 can be reduced in the main cooling part 5150. For example, water is sprayed to the exhaust gas passing therethrough in order to reduce the temperature of the exhaust gas of 350° C. to 90° C. Preferably, the size of the water particles sprayed from the main cooling part 5150 is much larger than the size of the particles generated from the spray nozzle 5735, and the control unit 5900 can adjust the amount of water supplied, etc., according to the temperature of the exhaust gas, etc.

[0130] Although not shown, the discharge pipe 130, the cyclone separator discharge pipe 5550, etc. also include unillustrated thermometers, air volume meters, etc., and the control unit 5900 can control and adjust related valves, air blowers 5570 or mist pumps 5730, etc.

[0131] Moreover, the function, droplet size, etc. of the spray nozzle 5735 have been described in detail, so the description thereof will be omitted below.

[0132] Reference Figure 8a and Figure 8b , the working process of the dust reduction system 5000 having such a structure is described as follows.

[0133] First, if Figure 7 and Figure 8a As shown, the exhaust gas exhausted from the engine 100 passes through the auxiliary cooling part 5130 and the main cooling part 5150 and flows into the cyclone separator 5300 .

[0134] Foreign matter included in the exhaust gas passes through the mist box 5720-mist pump 5730-high pressure water supply pipe 5740 and is captured by minute droplets sprayed by the spray nozzle 5735 inside the cyclone separator 5300 disposed at the end of the seat high pressure water supply pipe 5740 and gathered at the lower side of the cyclone separator 5300. The contaminated water gathered at the lower part of the cyclone separator 5300 flows along the contaminated water pipe 5400 including the contaminated water pipe 5410 and the contaminated water tank 5420 as the contaminated water discharge valve 5413 is opened and closed.

[0135] The clean air that passes through the cyclone separator 5300 passes through the blower 5570 and is discharged to the outside through the chimney.

[0136] Moreover, if Figure 8b As shown, the contaminated water pipe 5400 and the circulation pipe 5600 operate as follows.

[0137] The contaminated water pipe 5400 includes: a contaminated water piping 5410 for allowing the contaminated water to flow; a contaminated water discharge valve 5413, which is combined with the lower part of the cyclone separator 5300 and is used to open and close the contaminated water piping 5410; a contaminated water tank 5420 for receiving the contaminated water guided through the contaminated water piping 5410; a contaminated water pump 5430, which pressurizes and transfers the contaminated water received in the contaminated water tank 5420; a contaminated water filter 5440, which filters the contaminated water pressurized in the contaminated water pump 5430; a contaminated water reflux valve 5443, which allows the contaminated water passing through the contaminated water filter 5440 to return to the contaminated water tank 5420; and a contaminated water supply valve 5443, which can supply clean contaminated water passing through the contaminated water filter 5440 to the circulation box 5620.

[0138] The contaminated water filter 5440 or the micro filter 5640 described later may be replaced by a unit having a solid-liquid separation function including a filter press, and in the present embodiment, preferably, includes a cartridge filter.

[0139] The circulation pipe 5600 is an area that uses slightly clean water that has passed through the contaminated water pipe 5400.

[0140] The circulation pipe 5600 includes: a circulation pipe 5610, which allows the water contained in the circulation box 5620 to flow; a circulation pump 5630, which pressurizes the water; a microfilter 5640, which filters the water pressurized in the circulation pump 5630; a circulation return valve 5647, which guides the pressurized water back to the circulation box 5620; a cyclone separator water supply valve 5713, which allows the pressurized water to be supplied to the mist box 5720; a contaminated water pipe cleaning valve 5645, which guides the pressurized water cup to the contaminated water pipe 5410 and can clean foreign matter inside the contaminated water pipe 5410; and a circulation cleaning valve 5643, which allows the pressurized water to be supplied to the cyclone separator cleaning spray nozzle (not shown) arranged inside the cyclone separator 5300, so that foreign matter attached to the internal wall of the cyclone separator 5300 can be cleaned.

[0141] That is, the cyclone water stored in the circulation box 5620 after the polluted water has been cleaned to a certain extent can be used as water for washing or cleaning various pipes or the cyclone 5300, so that the water used for washing can be used as recycled water.

[0142] Furthermore, the mist main device 5700 includes: a mist water supply pipe 5710 for allowing water contained in the mist box 5720 to flow in; and a high-pressure water supply pipe 5740 for guiding high-pressure water through the mist pump 5730 that pressurizes clean water pressurized in the mist pump 5730.

[0143] The water pipe 5830 is connected to the mist water supply pipe 5710, and includes a water supply valve 5833 for opening and closing the water pipe 5830 that can supply water, such as a general tap water pipe.

[0144] The air pipe 5850 supplies air and is connected to the high-pressure water supply pipe 5740 at the front end of the spray nozzle 5735, and supplies high-pressure air to the spray nozzle 5735 to remove tiny dirt and foreign matter mixed in the tiny-sized spray nozzle 5735 (refer to the reference numeral 5853 for the supply of air). In addition, the air pipe 5850 is connected to the piping at the front end of the circulation cleaning valve 5643, and can remove dirt and foreign matter mixed in the cyclone separator cleaning spray nozzle provided at the end of the piping in a manner that can clean the inner wall of the cyclone separator (refer to the reference numeral 5855 for the supply of air). The pressurized air passing through the air pipe 5850 cleans the inside of the cyclone separator 5300 by air.

[0145] Reference numeral 5170 (not described) denotes a cooling portion supply spray nozzle that branches from the high-pressure water supply pipe 5740 and supplies high-pressure water to the main cooling member 5150 .

[0146] In this regard, according to the present invention, a dust reduction system including carbon soot exhausted from a large ship engine can be provided, which can stably and effectively remove dust including incompletely burned soot included in the high-temperature exhaust gas generated especially during the initial operation of the large ship engine and soot generated during the operation process until normal operation.

[0147] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can stably maintain the back pressure of the gas exhausted from the large ship engine.

[0148] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can save the cost of maintaining and managing a system for removing dust included in gas exhausted from a large ship engine, thereby improving economic efficiency.

[0149] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, wherein a cooling unit is provided upstream of a cyclone separator that sprays minute liquids to prevent minute droplets from evaporating at high temperatures, thereby increasing the capture efficiency of dust including soot.

[0150] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can separate solids from the collected matter collected at the lower part of the cyclone separator and can recycle liquid.

[0151] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can increase the efficiency of the ship engine.

[0152] Furthermore, the present invention can provide a dust reduction system that can achieve zero emission including soot exhausted from large ship engines.

[0153] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can prevent the generation of white smoke by evaporating moisture in the exhaust gas exhausted by high-temperature exhaust gas exhausted from the engine.

[0154] Wherein, multiple embodiments of the present invention are shown and described, and anyone skilled in the art of the present invention will know that the embodiments can be modified without departing from the principles or spirit of the present invention. The scope of the present invention is defined by the scope of the attached invention claims and their equivalents.

[0155] Description of Reference Numerals

[0156] 1000: Dust reduction system

[0157] 1100: Cooling unit 1300: Cyclone separator

[0158] 1330: first cyclone separator 1350: second cyclone separator

[0159] 1500: Dust reduction pipe 1510: Cooling inlet pipe

[0160] 1520: Cooling discharge pipe 1530: First cyclone separator discharge pipe

[0161] 1533: First exhaust valve 1535: First bypass valve

[0162] 1540: bypass pipe of the first cyclone separator 1550: discharge pipe of the second cyclone separator

[0163] 1560: Cyclone separator return pipe 1563: Return valve

[0164] 1570: Blower 1700: Mist main device

[0165] 1701: Water supply pipe 1703: Pump suction pipe

[0166] 1705: High-pressure water supply pipe 1706: High-pressure water branch valve

[0167] 1707: High pressure water return pipe 1710 water tank

[0168] 1720: High pressure pump 1730: Spray nozzle

[0169] 1800: Solid-liquid separation unit 1900: Control unit

[0170] 1930: First sensor 1950: Second sensor

[0171] 100: Engine 110: Intake

[0172] 130: Exhaust pipe 131: Intake bypass

[0173] 133: Discharge valve

[0174] 5000: Dust reduction system 5100: Cooling unit

[0175] 5130: Auxiliary cooling component 5150: Main cooling component

[0176] 5170: Cooling supply valve

[0177] 5300: Cyclone separator 5550: Cyclone separator exhaust gas pipe

[0178] 5570: Blower

[0179] 5400: Polluted water pipes

[0180] 5410: Contaminated water piping 5413: Contaminated water discharge valve

[0181] 5420: Polluted water tank 5430: Polluted water pump

[0182] 5440: Contaminated water filter 5443: Contaminated water return valve

[0183] 5445: Contaminated water supply valve

[0184] 5600: Circulation pipe

[0185] 5610: Circulation piping 5620: Circulation box

[0186] 5630: Circulation pump 5640: Micro filter

[0187] 5643: Circulation cleaning valve 5645: Contaminated water pipe cleaning valve

[0188] 5647: Circulation return valve

[0189] 5700: Mist Master Device

[0190] 5710: Mist water supply pipe 5713: Cyclone separator water supply valve

[0191] 5720: Mist box 5730: Mist pump

[0192] 5735: Spray nozzle 5740: High pressure water supply pipe

[0193] 5830: Water pipe 5833: Water supply valve

[0194] 5850: Air pipe 5853: Spray nozzle air valve

[0195] 5855: Cyclone Cleaning Air Valve

[0196] Industrial Applicability

[0197] According to the present invention, the present invention can provide a powder including carbon smoke discharged from a large ship engine.

[0198] Dust reduction system that can stably and effectively remove dust, especially in the early stages of large ship engines

[0199] The high-temperature exhaust gas generated during operation contains incompletely burned soot and

[0200] The soot dust generated during normal operation.

[0201] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can stably maintain the back pressure of the gas exhausted from the large ship engine.

[0202] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can save the cost of maintaining and managing a system for removing dust included in gas exhausted from a large ship engine, thereby improving economic efficiency.

[0203] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, wherein a cooling unit is provided upstream of a cyclone separator that sprays minute liquids to prevent minute droplets from evaporating at high temperatures, thereby increasing the capture efficiency of dust including soot.

[0204] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can separate solids from the collected matter collected at the lower part of the cyclone separator and can recycle liquid.

[0205] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can increase the efficiency of the ship engine.

[0206] Furthermore, the present invention can provide a dust reduction system that can achieve zero emission including soot exhausted from large ship engines.

[0207] Furthermore, the present invention can provide a dust reduction system including soot exhausted from a large ship engine, which can prevent the generation of white smoke by evaporating moisture in the exhaust gas exhausted by high-temperature exhaust gas exhausted from the engine.

Claims

1. A dust reduction system, characterized in that: include: an exhaust pipe for conducting exhaust gases from an engine including a marine engine; A cyclone separator that is branched from the exhaust pipe and is coupled to a dust reduction pipe including a blower, and that captures dust including soot contained in the exhaust gas by spraying minute droplets from a spray nozzle, thereby reducing the dust concentration in the exhaust gas to below a set value; and The mist main device supplies high-pressure water to the spray nozzle provided inside the cyclone separator.

2. The dust reduction system according to claim 1, characterized in that The average size of the droplets sprayed from the spray nozzle is in the range of 20 μm to 80 μm.

3. The dust reduction system according to claim 1 or 2, characterized in that: When the engine load is below 30%, the bulk density of the droplets ejected by the cyclone separator is 50 droplets / cm 3 ~20,000 / cm 3 within the range.

4. The dust reduction system according to claim 1, characterized in that: The invention further includes a cooling unit disposed upstream of the cyclone separator and configured to reduce the temperature of the exhaust gas branched from the exhaust pipe.

5. The dust reduction system according to claim 4, characterized in that Before the engine is started, the control unit controls the air blower, the mist main device, and the cyclone separator so that they can operate under a no-load condition.

6. The dust reduction system according to claim 5, characterized in that The cyclone separators are formed in a plurality of ways. The control unit controls the engine to operate the plurality of cyclone separators to a set first load, and operates only the cyclone separator located upstream of the dust reduction duct among the cyclone separators to a set second load exceeding the first load.

7. The dust reduction system according to claim 1, characterized in that When the second load is exceeded, the exhaust gas is discharged through the exhaust pipe.

8. The dust reduction system according to claim 1, characterized in that The invention also comprises a solid-liquid separation part, which collects the captured materials captured at the lower part of the cyclone separator and separates them into solid and liquid.

9. The dust reduction system according to claim 5, characterized in that: The above cyclone separator forms a The control unit performs the following control to operate the engine to operate the two annular ducts combined with multiple spray nozzles inside the cyclone separator to a set first load, and only operate one of the two annular ducts combined with spray nozzles inside the cyclone separator from the first load to a set second load.

10. A dust reduction system, characterized in that: include: an exhaust pipe for conducting exhaust gases from an engine including a marine engine; A cyclone separator that is branched from the exhaust pipe and is coupled to a dust reduction pipe including a blower, and that captures dust including soot contained in the exhaust gas by spraying minute droplets from a spray nozzle, thereby reducing the dust concentration in the exhaust gas to below a set value; and A mist main device supplies high-pressure water to the spray nozzle disposed inside the cyclone separator. The dust reduction system further includes a cooling unit provided upstream of the cyclone separator and configured to reduce a temperature of the exhaust gas branched from the exhaust pipe.

11. The dust reduction system according to claim 10, characterized in that The cooling unit includes an auxiliary cooling member so that the pipe discharged from the engine and the pipe discharged from the cyclone separator can exchange heat with each other.

12. The dust reduction system according to claim 10 or 11, characterized in that Foreign matters or contaminants included in the contaminated water discharged from the lower portion of the cyclone separator are removed to clean the interior of the cyclone separator or the contaminated water is used as water supplied to the spray nozzle.

13. The dust reduction system of claim 10, wherein: A chimney is formed downstream of the cyclone separator to discharge the gas into the atmosphere. comprising a discharge valve connecting the discharge pipe and the cyclone separator with the chimney, The discharge valve opens when the engine is subjected to back pressure.

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