Filtering device of ship flue gas collector

Abstract

The utility model discloses a ship flue gas collector filtering device, the flue gas collector is used for collecting waste gas in a ship flue, the filtering device comprises a coarse filter arranged in a sampling gas path, the coarse filter can filter the collected flue waste gas, the coarse filter is used for filtering smoke dust and tar in the waste gas, and the coarse filter is used for filtering the smoke dust and tar in the waste gas. The filter paper provides a larger contact area so as to prolong the service life; and the filter paper can also be fixed between the filter element and the sampling port (airflow inlet) by utilizing elastic force generated by the wave shape.

Description

Technical Field

[0001] The present application relates to the field of exhaust gas collection and monitoring, and in particular to a filtering device for a ship flue gas collector. Background Art

[0002] Greenhouse gas concentrations are increasing year by year, and the resulting climate warming is a major environmental issue facing the world. The transportation sector, as the third largest source of carbon emissions, has attracted significant attention from various countries. As an important means of transportation, ships' carbon emissions have had an increasingly serious impact on the environment of various countries' ship emission control areas with the rapid development of sea and river transportation. As a result, countries are increasingly stringent in controlling carbon emissions from ships.

[0003] Large cargo ships primarily use heavy fuel oil as fuel. The residue from heavy fuel oil combustion primarily consists of unburned flocculent charcoal dust and ash. This dust is primarily composed of carbon, sulfur dioxide, iron oxide, silicon dioxide, and aluminum oxide, and typically appears white. However, when ship dust appears black, it not only reduces fuel consumption, power output, and wear in the ship's engines, but also causes engine overheating, leading to the formation of large amounts of carbon deposits on pistons, piston rings, valves, and combustion chambers, reducing the engine's service life. Ship exhaust is also a carcinogen recognized by the World Health Organization and can cause serious health hazards such as asthma, heart disease, stroke, and premature death. Therefore, monitoring ship exhaust emissions is urgent. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the present application provides a filtering device for a ship flue gas collector.

[0005] The specific technical solutions of this application are as follows:

[0006] 1. A filtering device for a ship flue gas collector, characterized in that the flue gas collector uses a sampling air path to collect exhaust gas in the ship flue, and the filtering device includes a coarse filter arranged in the sampling air path, the coarse filter can filter the exhaust gas inside the sampling air path, and the coarse filter is used to filter smoke and tar in the exhaust gas.

[0007] 2. The filtering device according to item 1 is characterized in that the filtering device further includes a filter element arranged on the sampling gas path, and the filter element filters the exhaust gas in the sampling gas path again.

[0008] 3. The filtering device according to item 1 or 2 is characterized in that the coarse filter is made of quartz fiber and is easy to replace.

[0009] 4. The filtering device according to item 1 is characterized in that the coarse filter is a sheet-like structure; the thickness of the coarse filter is 1 to 2 mm; preferably, the thickness of the coarse filter is 1.5 mm.

[0010] 5. The filtering device according to item 2 is characterized in that a fixing structure is provided on the sampling gas path, and the fixing structure is used to fix the filter element.

[0011] 6. The filtering device according to item 5, characterized in that the fixing structure can also fix the coarse filter.

[0012] 7. The filtering device according to item 5 or 6 is characterized in that the fixed structure includes a gas inlet channel and a gas exhaust channel, the filter element and the coarse filter are arranged between the gas inlet channel and the gas exhaust channel, and the gas enters the gas inlet pipe and passes through the coarse filter and the filter element before being discharged from the gas exhaust pipe.

[0013] 8. The filtering device according to item 2 is characterized in that the coarse filter is arranged at an upstream position of the filter element, and the cross-sectional size of the coarse filter in the gas flow direction is equal to or similar to the cross-sectional size of the filter element in this direction.

[0014] 9. The filter device according to any one of items 1 to 8, characterized in that a plurality of guide grooves are provided on the surface of the coarse filter facing away from the filter element, and the gas diffuses into the guide grooves after flowing onto the coarse filter.

[0015] 10. The filtering device according to item 9 is characterized in that the guide groove extends linearly on the coarse filter to the edge of the coarse filter, and preferably, the multiple guide grooves are parallel to each other and have equal spacing.

[0016] 11. The filtering device according to item 9 or 10 is characterized in that the guide groove is opened in a ring shape; preferably, the guide groove is opened in a concentric shape with equal intervals.

[0017] 12. The filter device according to any one of items 9 to 11, wherein the depth of the guide groove on the surface of the coarse filter gradually increases from the center toward the edge.

[0018] 13. The filter device according to any one of items 9 to 12, characterized in that the coarse filter is square or round, preferably round, and is consistent with the shape of the rear filter element.

[0019] 14. The filtration device according to any one of items 1 to 13, characterized in that a diffusion groove is provided on the surface of the coarse filter close to the filter element.

[0020] 15. The filtering device according to item 14 is characterized in that the diffusion groove and the guide groove are staggered and the diffusion groove and the guide groove are centrally symmetrical.

[0021] 16. The filtration device according to any one of items 1 to 15, wherein the coarse filter is integrally formed.

[0022] 17. The filtration device according to any one of items 1 to 16, characterized in that the coarse filter has elasticity due to the action of the guide groove and the diffusion groove.

[0023] Beneficial effects

[0024] The filter paper of the filter device of the ship flue gas collector of the present application is wavy. The advantages of the wavy shape are: 1. It provides a larger contact area to increase the service life; 2. The elastic force generated by the wavy shape can be used to fix the filter paper between the filter element and the sampling port (air flow inlet). BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the coarse filter of this application;

[0026] Figure 2 It is a schematic cross-sectional view of the coarse filter of the present application;

[0027] Figure 3 This is an overall diagram of the filtering device of this application.

[0028] In the figure, 1. coarse filter; 2. guide groove; 3. diffusion groove; 4. fixed structure; 5. filter element; 6. gas inlet channel; 7. gas exhaust channel. DETAILED DESCRIPTION

[0029] The present application is described in detail below. Although specific embodiments of the present application are shown, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0030] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. For example, "including" or "comprising" mentioned throughout the specification and claims are open-ended terms and should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present application, but the description is based on the general principles of the specification and is not intended to limit the scope of the present application. The scope of protection of this application shall be as defined by the attached claims.

[0031] refer to Figure 1 and Figure 2The present application provides a filtering device for a ship's flue gas collector. The flue gas collector uses a sampling gas path to collect exhaust gas from the flue. The exhaust gas collected by the flue gas collector is also referred to as sample gas. The filtering device includes a coarse filter 1 disposed in the sampling gas path. The coarse filter 1 is capable of filtering the exhaust gas collected in the sampling gas path, and is used to filter smoke and tar from the exhaust gas.

[0032] Flue gas sampling is required for complete monitoring. However, ships often burn heavy fuel oil, and the residual exhaust gas from ships contains a high level of impurities. Consequently, excessive impurities can clog the filter, reducing its effectiveness and significantly shortening its service life.

[0033] The coarse filter 1 is used to perform preliminary filtration on the sampled exhaust gas, remove substances in the exhaust gas that are prone to clogging or accumulation, thereby reducing the possibility of clogging of the filter device and increasing the service life of the filter device.

[0034] When the filter device filters the sample gas, due to the large volume of liquid or fixed substances and the low fluidity of solid and liquid substances in the filter device, the fixed and liquid substances in the exhaust gas will quickly accumulate at the front end of the filter device, causing impurities to block the front end of the filter device, greatly reducing the gas passing efficiency in the filter device.

[0035] The coarse filter 1 is used to filter solid or liquid matter from the exhaust gas, so that the solid and liquid matter in the exhaust gas is collected and removed by the coarse filter 1, while the gaseous matter in the exhaust gas enters the filter device for filtration before being discharged into the air. Furthermore, while filtering the solid and gaseous matter from the exhaust gas, the coarse filter 1 also collects and classifies the filtered solid and gaseous matter, allowing more solid or liquid matter from the exhaust gas to accumulate in the coarse filter 1. At the same time, even after the solid or liquid matter accumulates in the coarse filter 1, the exhaust gas's passing efficiency can still be guaranteed.

[0036] Specifically, the coarse filter 1 has a structure with a filtering gap inside, and the size of the gap is adapted to the solid impurities in the exhaust gas, making it difficult for solid impurities and liquid impurities in the exhaust gas to pass through, while the gas can pass through smoothly. Furthermore, the gap in the coarse filter 1 allows the liquid matter in the exhaust gas to flow. However, the solid matter is blocked. Therefore, in the coarse filter 1, the solid and gas impurities filtered and collected in the exhaust gas will form a layered structure with liquid impurities located at the rear end and solid impurities located at the front end. This allows more solid or liquid impurities to be present on the coarse filter 1, thereby improving the service life of the filter device.

[0037] The filtering device further comprises a filter element 5 arranged on the flue, and the filter element 5 filters the gas in the flue again.

[0038] The coarse filter 1 is used to filter out liquid and solid impurities in the exhaust gas that are prone to cause blockage. The filter element 5 will then process the exhaust gas again and filter out other impurities in the exhaust gas that seriously pollute the environment. Only after the exhaust gas is processed can it enter the more downstream equipment or devices.

[0039] Use the coarse filter 1 to perform preliminary filtration on the exhaust gas and remove impurities in the exhaust gas that are prone to clogging; under the protection of the coarse filter 1, the filter element 5 will not directly contact the original smoke of the exhaust gas. When the coarse filter 1 is clogged due to the accumulation of pollutants, the filter element 5 will not be clogged (the impurities filtered by the filter element 5 can be cleaned by regular backflushing), and the maintenance of the flue gas sampler can be completed by replacing the coarse filter 1. This double filtration of the coarse filter 1 and the filter element 5 can ensure the efficiency of exhaust gas treatment while reducing the possibility of exhaust gas clogging in the filter device; allowing the filter device to filter more gas. It also prolongs the service life of the filter device and improves the service life of the filter device.

[0040] The coarse filter 1 is arranged upstream of the filter element 5 , and the cross-sectional size of the coarse filter 1 in the gas flow direction is equal to or similar to the cross-sectional size of the filter element 5 in this direction.

[0041] The coarse filter 1 is arranged upstream of the filter element 5. The coarse filter 1 collects and filters liquid and solid impurities in the exhaust gas, reducing the amount of solid and liquid impurities entering the filter element 5, thereby reducing the possibility of clogging the filter element 5 and extending the service life of the filter element 5.

[0042] Since the diameter of the sampling gas path is adapted to the sampling volume, the sampling gas path is filled with exhaust gas. In order to reduce the possibility of impurities such as smoke and tar in the exhaust gas that are difficult to backflush and clean flowing onto the filter element 5 and clogging the filter element 5, the size of the coarse filter 1 is set to be equal to or similar to the size of the filter element 5. Furthermore, the radial dimensions of the coarse filter 1 and the filter element 5 are equal to the inner diameter of the cavity of the flue gas filter and the sampling gas path. Therefore, when the exhaust gas in the flue flows, it will all be filtered by the coarse filter 1, thereby reducing the possibility of liquid or solid materials in the exhaust gas clogging the filter element 5. At the same time, it can also reduce the occurrence of exhaust gas leakage from the gap between the filter element 5 and the flue, reducing the contamination of the back-end measuring device by impurities.

[0043] In one embodiment, the coarse filter 1 is made of quartz fiber.

[0044] Because the exhaust gas in the flue sampling gas path is at a high temperature and contains some harmful and corrosive substances, the coarse filter 1 is made of quartz fiber material with advantages such as high temperature resistance and corrosion resistance, thereby increasing the service life of the coarse filter 1. At the same time, the production cost of quartz fiber material is relatively low, which helps to control the cost of the coarse filter 1.

[0045] In another specific embodiment, the coarse filter 1 is made of nickel-titanium powder metallurgy material.

[0046] The coarse filter 1 is a sheet-like structure; the thickness of the coarse filter 1 is 1 to 2 mm; preferably, the thickness of the coarse filter 1 is 1.5 mm.

[0047] Specifically, the thickness of the coarse filter 1 is: 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.8 mm, and 2 mm.

[0048] A fixing structure 4 is provided on the flue, and is used to fix the filter element 5 .

[0049] The fixing structure can also fix the coarse filter 1 .

[0050] Exhaust gas in the sampling gas path needs to be filtered through coarse filter 1 and filter element 5. Because exhaust gas flowing in the sampling gas path generates thrust, a fixing structure 4 is used to secure filter element 5 and coarse filter 1 to minimize displacement of the filter element 5 and coarse filter 1 in the flue. This reduces the possibility of gaps forming between coarse filter 1 and filter element 5 and the flue, allowing filter element 5 and coarse filter 1 to fully filter the exhaust gas in the flue. This also reduces the possibility of exhaust gas entering the back-end measurement device without being filtered.

[0051] The fixed structure 4 includes a gas inlet channel 6 and a gas exhaust channel 7. The filter element 5 and the coarse filter 1 are arranged between the gas inlet channel 6 and the gas exhaust channel 7. After the gas enters the gas inlet channel 6, it passes through the coarse filter 1 and the filter element 5 and is then discharged from the gas exhaust channel 7.

[0052] The gas inlet channel 6 and the gas outlet channel 7 are both connected to the flue. The exhaust gas in the flue enters from the gas inlet channel 6, and then passes through the coarse filter 1 and the filter element 5 to filter and treat the exhaust gas, and then is discharged from the gas outlet channel 7.

[0053] In the present application, the filter element 5 and the coarse filter 1 are fixed using a fixing structure 4 .

[0054] Specifically, the structure of the fixed filter element 5 in this application is identical to conventional fixed filter element 5 structures in the art. Specifically, the fixed structure includes a first fixed assembly and a second fixed assembly connected to each other. In this application, the filter element 5 is welded to the second fixed assembly, and the second fixed assembly is screwed to the first fixed assembly. An O-ring is used to seal the first and second fixed assemblies.

[0055] The coarse filter 1 is also placed in the fixing structure 4 and is mounted upstream of the filter element 5. The fixing structure 4 is used to fix the coarse filter 1 and the filter element 5 at the same time.

[0056] The coarse filter 1 is square or round, preferably round, and is consistent in shape with the rear filter element 5 .

[0057] A plurality of guide grooves 2 are provided on the surface of the coarse filter 1 facing away from the filter element 5 . After the gas flows onto the coarse filter 1 , it diffuses into the guide grooves 2 .

[0058] The guide groove 2 is used to guide the exhaust gas in the flue. When the exhaust gas flows to the position of the filter device in the sampling gas path.

[0059] The filter element 5 and the coarse filter 1 are arranged in the sampling gas path, and the exhaust gas inside the flue is continuously collected. Therefore, in order to extend the service life of the coarse filter 1 and the filter element 5, the size of the coarse filter 1 and the filter element 5 is increased, thereby extending the time required for the coarse filter 1 and the filter element 5 to be blocked, thereby improving the service life of the filter element 5 and the coarse filter 1.

[0060] Since the sampling gas path is a linear structure, in order to connect the coarse filter 1 and the filter element 5 of equivalent larger size to the flue, a fixing structure 4 is used to fix the coarse filter 1 and the filter element 5, and the coarse filter 1 and the filter element 5 are connected to the flue to filter the collected exhaust gas.

[0061] Affected by the flue pressure and the sampling gas path pressure, if the coarse filter is a flat-plate structure, the exhaust gas will converge at the position where the coarse filter 1 is connected to the gas inlet channel when flowing from the gas inlet channel to the coarse filter 1, making it difficult for the exhaust gas to diffuse on the surface of the coarse filter 1, and thus the edge of the coarse filter 1 or the part away from the outlet of the gas inlet channel cannot function.

[0062] Therefore, the present application provides a guide groove 2 on the coarse filter 1, so that after the exhaust gas flows from the gas inlet channel to the coarse filter 1, while the exhaust gas is filtered by the coarse filter 1, part of the exhaust gas will be transported to the edge or a position away from the flue along the guide groove 2, thereby increasing the use area and efficiency of the coarse filter 1. Furthermore, when the coarse filter 1 near the middle or the position near the gas inlet channel becomes clogged after filtering a large amount of exhaust gas, the guide groove 2 can also be used to transport the exhaust gas to the edge of the coarse filter 1 or a position away from the flue, so that the coarse filter 1 can be fully utilized and the service life of the coarse filter 1 can be increased.

[0063] The guide grooves 2 extend linearly on the coarse filter 1 to the edge of the coarse filter 1 . Preferably, the plurality of guide grooves 2 are parallel to each other and have equal spacing therebetween.

[0064] In order to allow the exhaust gas to flow along the guide groove 2 to the edge of the coarse filter 1, the tail end of the guide groove 2 is opened to the edge of the coarse filter 1 or a position away from the flue at the beginning of the guide groove 2, so that the exhaust gas can be transported to different positions of the coarse filter 1 by the guide groove 2, thereby improving the utilization rate of the coarse filter 1.

[0065] The guide grooves 2 are evenly arranged when they are opened, so that the exhaust gas can be evenly dispersed into the guide grooves 2 when it flows in the guide grooves 2. At the same time, the exhaust gas can be evenly dispersed into each guide groove 2 when it flows from the flue to the coarse filter 1.

[0066] The guide grooves 2 are provided in an annular shape; preferably, the guide grooves 2 are provided in a concentric shape with equal intervals.

[0067] When exhaust gas enters the annular, concentric, and equidistant guide grooves 2, it circumferentially fills the guide grooves 2 and then permeates the coarse filter 1, achieving preliminary filtration of the exhaust gas. Furthermore, the annular structure allows the exhaust gas to flow through the gaps in the inner guide grooves 2 and into the outer guide grooves 2, achieving outer-circular diffusion of the exhaust gas while also filtering it.

[0068] The depth of the guide groove 2 on the surface of the coarse filter 1 gradually increases from the center to the edge.

[0069] In the present application, the flue and the gas inlet duct are located near the center of the coarse filter 1. When the gas enters the coarse filter 1, it will pass into a position near the middle. The depth of the guide groove 2 located in the center is set to be shallower, so that the guide groove 2 located in the center can be quickly filled with exhaust gas, and then the exhaust gas can overflow from the guide groove 2 located in the center to the guide groove 2 of the outer ring. Therefore, when the coarse filter 1 filters the exhaust gas, the guide groove 2 can fully diffuse the exhaust gas to various positions on the surface of the coarse filter 1. Furthermore, the guide groove 2 in the center is shallower, and at the same time, a larger gap is created between the coarse filter 1 and the fixed structure 4, making it more convenient for the exhaust gas to diffuse from the center position of the coarse filter 1 to the edge position. This further improves the utilization rate of the coarse filter 1.

[0070] A diffusion groove 3 is provided on the surface of the coarse filter 1 close to the filter element 5 .

[0071] After the exhaust gas passes through the coarse filter 1, it forms the first exhaust gas containing no or a small amount of solid or liquid impurities. The first exhaust gas continues to flow downstream and enters the filter element 5 for filtration. The diffusion tank 3 is used to guide the gas passing through the coarse filter 1 so that the first exhaust gas can enter the filter element 5 evenly.

[0072] The diffusion groove 3 and the guide groove 2 are staggered and centrally symmetrical.

[0073] The diffusion grooves 3 and the guide grooves 2 are symmetrically arranged, so that the coarse filter 1 is formed into a wavy paper with uniform thickness. Therefore, the coarse filter 1 is also called filter paper.

[0074] In the present application, the diffusion groove 3 and the guide groove 2 are formed by bending and shaping the filter paper, so the coarse filter 1 is an integrally formed structure.

[0075] The coarse filter 1 has elasticity under the action of the guide groove 2 and the diffusion groove 3.

[0076] Both the guide groove 2 and the diffusion groove 3 are annular and centrally symmetrically formed on the filter paper. This creates a wave-like pattern that spreads outward from the center. This structure imparts a degree of elasticity to the filter paper, allowing the radial dimensions of the guide groove 2, diffusion groove 3, and the filter paper itself to expand or contract.

[0077] In addition, the elastically deformed filter element 5 also makes it easier for the exhaust gas to diffuse in the guide groove 2 and the diffusion groove 3 in the filter element 5, and the elastic deformation also creates a larger gap in the axial direction between the filter element 5 and the fixed structure 4 to allow the exhaust gas to diffuse. Furthermore, the pressure of the fixing device 4 causes the filter paper to bend outward, making the fit between the filter paper and the fixed structure 4 tighter, thereby reducing the possibility of exhaust gas leakage from the edge of the filter paper.

[0078] In summary, this application provides a filtering device for a ship's flue gas collector. The flue gas collector collects exhaust gas from the flue, and the filtering device filters the collected sample gas, thereby transporting the sample gas to subsequent equipment or devices. The filtering device is arranged in the sampling gas path. The sample gas first enters the sampling gas path and then enters the gas inlet channel 6, where it is filtered by the filtering device.

[0079] When the filter device filters the sample gas, the filter paper filters the sample gas, removing impurities such as smoke and tar from the sample gas. The sample gas is then filtered and processed by the filter element 5 located downstream of the filter paper before being discharged from the gas discharge channel 7 and subsequently entering the subsequent equipment or device. After the initial filtration of the sample gas by the filter paper removes or reduces impurities such as smoke and tar in the sample gas that are prone to clogging, the filter element 5 can filter more sample gas, extending the service life of the filter element 5 and thus extending the service life of the filter device.

[0080] Example 1

[0081] The present application provides a filter device for a ship flue gas collector, wherein the filter paper has a diameter of 50 mm and a thickness of 1.5 mm. The filter paper is made of quartz fiber. The coarse filter has a wavy cross-section in the thickness direction.

[0082] The filter element is a nickel-titanium powder metallurgy filter element (filtration accuracy 30μm). The diameter of the gas inlet pipe is 8mm. The diameter of the gas outlet pipe is 6mm.

[0083] Comparative Example 1

[0084] Preliminary filtration was performed using filter paper of different materials. The filter paper was made of nickel-titanium powder metallurgy. The filter element and mounting structure were the same as in Example 1. The usage time or filtration efficiency was recorded.

[0085] Comparative Example 2

[0086] Preliminary filtration was performed using filter paper of the same material (glass fiber) but with different structures. The filter paper was a flat sheet with a thickness of 3 mm and a diameter of 50 mm. The filter element and mounting structure were the same as in the previous embodiment. The usage time or filtration efficiency was recorded.

[0087] Comparative Example 3

[0088] Preliminary filtration was performed using filter paper of the same material as the filter paper in Example 1, but with a different structure. The filter paper was cylindrical and installed in the gas inlet channel, filling the channel. The filter element mounting structure was the same as in Example 1. During installation, the diameter of the gas inlet channel was enlarged and the cylindrical filter paper was inserted into the channel. Usage time and efficiency were recorded.

[0089] Comparative Example 4

[0090] Preliminary filtration was performed using filter paper of the same material but with different structures. The filter paper had a rectangular, folded shape. The filter element and fixing structure were the same as in Example 1. The usage time and efficiency were recorded.

[0091] Table 1

[0092] Usage time Filtration efficiency Example 1 2 months Can be outdated Comparative Example 1 2 months Can't be outdated Comparative Example 2 2 months Can't be outdated Comparative Example 3 2 months Can't be outdated Comparative Example 4 2 months Can't be outdated

[0093] Comparative analysis

[0094] Comparative Example 1

[0095] Affected by the flue pressure and the sampling gas path pressure, the nickel-titanium powder metallurgy filter element is tightly attached to the entrance of the gas inlet channel. When the exhaust gas flows from the gas inlet channel to the filter paper, the pollutants gather at the position connected to the gas inlet channel. The exhaust gas is difficult to diffuse on the surface of the filter paper, and the edge of the filter paper or the part away from the outlet of the gas inlet channel cannot play a role.

[0096] Comparative Example 2

[0097] Affected by the flue pressure and the sampling gas path pressure, the nickel-titanium powder metallurgy filter element is tightly attached to the entrance of the gas inlet channel. When the exhaust gas flows from the gas inlet channel to the filter paper, the pollutants gather at the position connected to the gas inlet channel. The exhaust gas is difficult to diffuse on the surface of the filter paper, and the edge of the filter paper or the part away from the outlet of the gas inlet channel cannot play a role.

[0098] Comparative Example 3

[0099] Affected by the backflush function and the moisture in the exhaust gas, the filter paper is damaged, and part of the filter paper is stuck in the gas inlet channel or falls into the flue, making it unusable.

[0100] Comparative Example 4

[0101] Since the rectangular structure cannot completely cover the filter element 5, part of the original smoke is in direct contact with the filter element 5, and pollutants accumulate on the surface of the filter element 5. Backflushing cannot remove the pollutants on the surface of the filter element 5, resulting in air failure.

[0102] In summary, the filter device of the ship flue gas collector of the present application improves the structure of the filter paper, which greatly improves the sealing performance of the filter paper. At the same time, the present application uses filter paper made of quartz fiber material for preliminary filtration, so that the filter paper can withstand the high temperature of the exhaust gas, and can also effectively filter impurities in the exhaust gas that are easy to clog. Compared with other materials, filter paper made of quartz fiber material has a higher filtering effect and also has a longer service life. Moreover, the manufacturing and processing cost of quartz fiber filter paper is low, which helps to control the cost of using the filtering device. In addition, in the present application, the filter paper is set to be wavy, so that the filter paper has a certain elasticity, so that the filter paper can be squeezed to the front end of the filter element 5 so that the sample gas needs to be initially filtered by the filter paper before it can flow through the filter element 5. Moreover, the wavy filter paper can also guide the sample gas, so that the sample gas can flow to every corner of the filter paper, thereby improving the utilization rate of the filter paper.

[0103] Furthermore, while adding filter paper upstream of filter element 5 adds a limited cost, the benefits it brings are enormous. Not only does it extend the service life of the filter paper and the filter device, but it also reduces their failure rates. Furthermore, it allows the exhaust gas to be filtered more smoothly before entering subsequent equipment, further reducing the likelihood of failures and accidents. Clearly, the benefits of adding filter paper upstream of filter element 5 far outweigh the costs.

[0104] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A filter device for a ship flue gas collector, characterized in that: The flue gas collector uses a sampling gas path to collect exhaust gas in a ship's flue. The filtering device includes a coarse filter arranged in the sampling gas path. The coarse filter can filter the exhaust gas inside the sampling gas path. The coarse filter is used to filter smoke and tar in the exhaust gas.

2. The filtering device according to claim 1, characterized in that The filtering device further comprises a filter element arranged on the sampling gas path, and the filter element filters the exhaust gas in the sampling gas path again.

3. The filtering device according to claim 1, characterized in that The coarse filter is a sheet-like structure; the thickness of the coarse filter is 1 to 2 mm.

4. The filtering device according to claim 3, characterized in that The thickness of the coarse filter is 1.5 mm.

5. The filtering device according to claim 2, characterized in that A fixing structure is provided on the sampling gas path, and the fixing structure is used to fix the filter element.

6. The filtering device according to claim 5, characterized in that The fixing structure can also fix the coarse filter.

7. The filtering device according to claim 6, characterized in that The fixed structure includes a gas inlet channel and a gas outlet channel, the filter element and the coarse filter are arranged between the gas inlet channel and the gas outlet channel, and the gas enters the gas inlet pipe, passes through the coarse filter and the filter element, and is then discharged from the gas outlet pipe.

8. The filtering device according to claim 2, characterized in that The coarse filter is arranged at an upstream position of the filter element, and the cross-sectional size of the coarse filter in the gas flow direction is equal to or similar to the cross-sectional size of the filter element in this direction.

9. The filtering device according to claim 2, characterized in that A plurality of guide grooves are provided on the surface of the coarse filter facing away from the filter element. After the gas flows onto the coarse filter, it diffuses into the guide grooves.

10. The filtering device according to claim 9, characterized in that The guide groove extends linearly on the coarse filter to the edge of the coarse filter.

11. The filtering device according to claim 10, characterized in that The multiple guide grooves are parallel to each other and have equal spacing.

12. The filtering device according to claim 9, characterized in that The guide groove is opened in an annular shape.

13. The filtering device according to claim 12, characterized in that The guide grooves are concentrically arranged with equal intervals.

14. The filtering device according to claim 9, characterized in that The depth of the guide groove on the surface of the coarse filter gradually increases from the center to the edge.

15. The filtering device according to claim 9, characterized in that The coarse filter is square or circular.

16. The filtering device according to claim 15, characterized in that The coarse filter is circular and consistent with the shape of the rear filter element.

17. The filtering device according to claim 9, characterized in that A diffusion groove is provided on the surface of the coarse filter close to the filter element.

18. The filtering device according to claim 17, characterized in that The diffusion groove and the guide groove are staggered and formed in a centrally symmetrical manner.

19. The filtering device according to claim 1, characterized in that The coarse filter is integrally formed.

20. The filtering device according to claim 17, wherein The coarse filter has elasticity under the action of the guide groove and the diffusion groove.

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