Air purification device and ship

Abstract

The utility model provides an air purification device which comprises a centrifugal fan, the centrifugal fan comprises a machine shell, the machine shell is provided with an axial inlet and a circumferential outlet, a fluid path is formed between the axial inlet and the circumferential outlet, centrifugal blades are arranged in the machine shell, and the centrifugal blades are arranged in the machine shell. The centrifugal blades rotate around the rotating center so that gas outside the machine shell can enter the fluid path from the axial inlet and flow out from the circumferential outlet, a high-pressure area is formed in the fluid path, and the pressure of the gas is larger than that of the gas at the axial inlet when the gas flows through the high-pressure area; the air purification device comprises a high-pressure area, a catalyst is arranged in the high-pressure area, the air purification device further comprises a heating unit, the heating unit can heat the catalyst to be within a preset temperature range, methanol steam on a ship can be rapidly and safely treated, and therefore harm of the methanol steam to personnel and the environment is reduced or avoided.

Description

Technical Field

[0001] This utility model belongs to the field of air purification technology, specifically relating to an air purification device and a ship. Background Technology

[0002] Currently, the global shipping industry is facing urgent challenges in low-carbon emission reduction. As a significant source of global greenhouse gas emissions, the green transformation of the shipping industry remains a crucial link in the global climate governance system, making the exploration and application of alternative fuel technologies particularly urgent. Among various alternative fuel technologies, methanol fuel, with its unique advantages such as high maturity, strong compatibility, and a well-established supply chain, has become one of the fastest commercially viable paths in the decarbonization process of the shipping industry. Methanol-fueled marine engines can not only achieve dual-fuel operation by modifying traditional diesel engines, but can also be directly designed as pure methanol power systems. Its technological flexibility gives it significant market competitiveness during the current emission reduction transition period, and it is rapidly moving from the stage of large-scale demonstration applications to becoming a mainstream fuel choice.

[0003] However, during the large-scale operation of methanol-powered ships, fuel leakage problems have gradually emerged. To avoid or reduce methanol fuel leakage and evaporation, protective measures such as double-walled storage tanks, mechanical seals, and pressure monitoring are generally adopted. However, due to factors such as ship turbulence and vibration, thermal expansion and contraction of pipelines, pressure fluctuations during loading and unloading operations, and routine maintenance and disassembly, a small amount of methanol vapor still leaks into the ship's cabins through valve interfaces, flange seals, and other parts. Methanol, as a colorless and transparent volatile liquid, has a slight alcoholic odor in its vapor, with an odor threshold of approximately 140 mg / m³ (about 44 ppm). This makes it difficult for crew members to detect minute leaks in a timely manner, even though they need to be on duty and living in the cabin for several months. Prolonged exposure to methanol vapor can cause discomfort symptoms such as headaches and blurred vision among crew members. Furthermore, methanol vapor mixed with air can form an explosive mixture with an explosion limit of 6%-36.5%, posing a significant safety risk. As a water-soluble organic compound, direct discharge of methanol through the ventilation system could pollute port waters, which does not comply with relevant regulations.

[0004] In summary, how to quickly and safely treat methanol vapor on ships is a pressing technical problem that needs to be solved. Utility Model Content

[0005] Therefore, this utility model provides an air purification device and a ship that can quickly and safely treat methanol vapor on the ship to reduce or avoid the harm caused by methanol vapor to personnel and the environment.

[0006] In one aspect, the utility model provides an air purification device, including centrifugal fan, the centrifugal fan includes the casing, the casing has axial import and peripheral export, the axial import and the peripheral export between form fluid path, be provided with centrifugal vane in the casing, the centrifugal vane rotates around the rotating center can make the casing external gas from the axial import into the fluid path and from the peripheral export, the fluid path has high pressure area, when the gas flows through the high pressure area, the pressure of gas is greater than the gas pressure at the axial import, the air purification device still includes heating unit, the heating unit can heat the catalyst to the preset temperature range.

[0007] In some embodiments, two adjacent centrifugal vanes form a vane group, the vane group forms a fluid passage, the fluid path includes the fluid passage; the flow area of the inlet of the fluid passage is greater than the flow area of the outlet of the fluid passage, and the catalyst is arranged at the outlet of the fluid passage.

[0008] In some embodiments, one end of the centrifugal vane close to the rotating center is an inner end, and the opposite end is an outer end; the outer end of at least one centrifugal vane in the vane group is provided with a flow limiting plate, and the flow limiting plate gradually inclines toward the fluid passage along the flow direction of the gas. In some embodiments, the catalyst is arranged on the side of the flow limiting plate facing the fluid passage.

[0009] In some embodiments, the heating unit is arranged as an eddy current generator and is outside the casing, the casing is made of a non-metal material, the flow limiting plate is made of a metal material, and the heating unit can heat the flow limiting plate when working.

[0010] In some embodiments, the centrifugal fan includes a rotating shaft, and the centrifugal vane is arranged on the rotating shaft; one end of the rotating shaft is provided with a blind hole, and a through hole communicating the blind hole and the fluid passage is arranged on the rotating shaft, and the opening of the blind hole constitutes the axial import.

[0011] In some embodiments, two centrifugal vanes in the vane group constitute a centrifugal pipe, the inner hole of the centrifugal pipe forms the fluid passage, and the inlet of the centrifugal pipe is in sealed communication with the through hole.

[0012] In some embodiments, the centrifugal fan is provided with a discharge pipe, the discharge pipe is in communication with the peripheral outlet, the flow area of the discharge pipe is smaller than the flow area of the peripheral outlet; a cooling unit is arranged in thermal coupling with the discharge pipe.

[0013] In some embodiments, a branch pipe is arranged on the exhaust pipe, and the cooling unit is arranged between the branch pipe and the circumferential outlet.

[0014] In another aspect, the utility model provides a kind of ship, including power system with methanol as fuel and the air purification device of the described, the catalyst can be in preset temperature range Methanol vapor is catalytically oxidized into carbon dioxide and water.

[0015] The utility model discloses a centrifugal fan is arranged, centrifugal fan works, centrifugal blade will outside containing methanol air continuously from axial inlet suction into the casing, air (containing methanol) enters from axial inlet under the action of centrifugal blade and flows to radial (the radial of casing, also the radial of rotating shaft) outside along fluid path, air flows through high pressure area, pressure and methanol vapor concentration increase, simultaneously, catalyst is arranged in pressure area, catalyst can be elevated to preset temperature range under the heating of heating unit, methanol vapor is oxidized into carbon dioxide and water under the catalytic oxidation of catalyst, carbon dioxide and water are discharged from circumferential outlet.Such, realize the harmless treatment of methanol vapor.Due to the continuous work of centrifugal fan, then the air in certain closed area is continuously suctioned into casing and is catalytically oxidized, and then air is treated in time, due to the arrangement of high pressure area, even if the methanol vapor contained in air is less, can also be concentrated in high pressure area and complete catalytic oxidation, improve the efficiency of methanol vapor treatment. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the embodiment of the utility model or the technical scheme in the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. The drawings in the following description are only exemplary, and for those skilled in the art, other implementation drawings can be obtained according to the provided drawings without creating labor.

[0017] Figure 1 It is the air purification device structure schematic view of the utility model embodiment.

[0018] The reference signs are:

[0019] 1, heating unit;2, temperature sensor;3, flow limiting plate;4, adjusting device;5, condensate coil;6, exhaust branch pipe;601, filter screen;7, exhaust pipe;801, centrifugal fan;802, casing;803, axial inlet;804, circumferential outlet;805, centrifugal blade;806, high pressure area;8051, inner end;8052, outer end;8053, fluid passage;9, rotating shaft;901, through hole. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. The description of the at least one exemplary embodiment is merely illustrative in nature and by no means as any limitation to the present utility model and its application or use. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present utility model.

[0021] In the description of the present utility model, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the scope of protection of the present utility model; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0022] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0023] In addition, it should be noted that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation to the scope of protection of the present utility model.

[0024] Among various alternative fuel technologies, methanol fuel has become one of the fastest paths to commercial application in the decarbonization process of the shipping industry due to its unique advantages such as high maturity, strong compatibility, and perfect supply chain foundation. Methanol fuel engine for ships can not only achieve dual-fuel operation by modifying traditional diesel engines, but also be directly designed as a pure methanol power system. The flexibility of its technical route makes it have significant market competitiveness in the current emission reduction transition period, and it is accelerating from the stage of large-scale demonstration application to the mainstream fuel selection.

[0025] In recent years, global technological innovation and practical application of methanol fuel ships have continued to break through. However, during the large-scale operation of methanol-powered ships, fuel leakage problems gradually appear. Although double-layer storage tanks, mechanical seals, and pressure monitoring are used as protective measures, influenced by factors such as ship vibration, pipe thermal expansion and contraction, pressure fluctuations during loading and unloading operations, and daily maintenance and disassembly, a small amount of methanol vapor may still leak through valve interfaces, flange seals, and other parts into the ship's cabin. As a colorless and transparent volatile liquid, methanol vapor has a slight alcohol smell, and the odor threshold is about 140 mg / m³ (about 44 ppm), which makes it difficult for crew members to detect trace leaks in a timely manner, and crew members need to work and live in the cabin for several months. Long-term exposure to methanol vapor can cause symptoms such as headaches and blurred vision, and the mixture of methanol vapor and air can form an explosive mixture with an explosion limit of 6%-36.5%, posing a significant safety risk.

[0026] At the same time, as a water-soluble organic compound, methanol may cause pollution to port waters if directly discharged through the ventilation system, which does not meet the requirements of relevant EU regulations. From the perspective of environmental compliance and personnel safety, an efficient methanol vapor treatment system needs to be deployed in the ship's cabin and fuel tank area.

[0027] Therefore, the air purification device provided by the present application, as shown in Figure 1 The centrifugal fan 801 includes a housing 802 having an axial inlet 803 and a circumferential outlet 804, a fluid path is formed between the axial inlet 803 and the circumferential outlet 804, a centrifugal blade 805 is arranged in the housing 802, the centrifugal blade 805 rotates around a rotation center to enable external gas of the housing 802 to enter the fluid path from the axial inlet 803 and flow out from the circumferential outlet 804, the fluid path has a high-pressure area 806, and the pressure of the gas flowing through the high-pressure area 806 is greater than the pressure of the gas at the axial inlet 803; a catalyst is arranged in the high-pressure area 806, and the air purification device further includes a heating unit 1 capable of heating the catalyst to a preset temperature range.

[0028] The utility model discloses a centrifugal fan 801 is set up, centrifugal fan 801 works, centrifugal blade 805 will outside containing methanol air continuously suck into the casing 802 from axial inlet 803, after air (containing methanol) enters from axial inlet 803 under the action of centrifugal blade 805, along the fluid path to the radial (the radial of casing 802, also the radial of rotating shaft 9) outside flow, when air flows through high pressure area 806, pressure increases higher than the gas pressure of axial inlet 803 (the gas pressure of axial inlet 803 is the atmospheric pressure of the environment where air purification device is located). When air purification device is set in the area of lower altitude, or is set on the ship, the pressure of axial inlet 803 can be understood as a standard atmospheric pressure, a standard atmospheric pressure (1 standard atmospheric pressure (atm) is defined as the static pressure of sea level, temperature is 15 DEG C (288.15K), the gravitational acceleration is 9.80665 m / s 2, the accurate value is 101325 Pa, generally can be simplified as 101KPa), and then the methanol steam concentration increases in high pressure area 806, and the catalyst is arranged in the pressure area, the catalyst can be raised to the preset temperature range under the heating of heating unit 1, and the higher concentration of methanol steam (the higher concentration of methanol steam can improve the processing efficiency of methanol steam) is oxidized to carbon dioxide and water under the catalytic oxidation of catalyst, and carbon dioxide and water are discharged from the circumferential outlet 804. In this way, the harmless treatment of methanol steam is realized. Since centrifugal fan 801 can work continuously, the air in a certain closed area is continuously sucked into the casing 802 for catalytic oxidation, and the air is treated in time, and since the high pressure area 806 is arranged, even if the methanol steam contained in the air is less, the catalytic oxidation can be completed after the concentration in the high pressure area 806, and the efficiency of methanol steam treatment is improved.

[0029] Further, the catalyst type can include a noble metal catalyst with platinum, palladium and other noble metals as the main active component, and a transition metal catalyst with manganese, nickel and other transition metals as the main active component, or some combination of the two types of catalysts. The catalyst can also use a non-metal catalyst, which needs to be suitable for catalytic oxidation of methanol.

[0030] Preferably, two adjacent centrifugal blades 805 form a blade group, the blade group forms a fluid channel 8053, the fluid path includes the fluid channel 8053; the flow area of the inlet of the fluid channel 8053 is greater than the flow area of the outlet of the fluid channel 8053, and the catalyst is arranged at the outlet of the fluid channel 8053.

[0031] By making the flow area of the inlet of the fluid channel 8053 greater than the flow area of the outlet of the fluid channel 8053, the volume of the gas is compressed when the gas flows through the outlet of the fluid channel 8053, and the concentration of methanol in the gas increases, improving the reaction efficiency of methanol.

[0032] Preferably, as shown in Figure 1 The centrifugal blade 805 has an inner end 8051 close to the center of rotation and an outer end 8052 opposite to the inner end 8051. The outer end 8052 of at least one centrifugal blade 805 in the blade set is provided with a flow limiting plate 3. The flow limiting plate 3 gradually inclines towards the fluid passage 8053 along the flow direction of the gas.

[0033] By providing the flow limiting plate 3 at the outer end 8052 of at least one centrifugal blade 805 in the blade set, the gas flows from the inner end 8051 to the outer end 8052 of the fluid passage 8053 and contacts the flow limiting plate 3. The gas is blocked by the flow limiting plate 3 and forms at least a partial high pressure area 806 in the region corresponding to the inclined surface of the flow limiting plate 3. In this region, the pressure of the gas increases, the density of the gas increases, the concentration of the impurities (such as methanol) contained in the gas also increases, and the collision rate of the methanol molecules with the catalyst in a unit volume is improved, which is beneficial to improve the reaction efficiency. At the same time, the catalyst in the high pressure area 806 is heated by the heating unit 1 to a preset temperature range, and the methanol in the gas is oxidized to carbon dioxide and water after contacting the catalyst, thereby realizing the harmless treatment of the methanol. The high pressure area 806 formed by the flow limiting plate 3 is in a flowing state and changes with the rotation of the centrifugal blade 805, which enables the centrifugal blade 805 to disturb the gas during rotation and avoid uneven treatment of the gas (if the high pressure area 806 is a fixed area in the shell 802, the concentration of methanol in some areas will be low and the concentration of methanol in some areas will be high), thereby improving the treatment efficiency of the methanol.

[0034] Preferably, as shown in Figure 1 The outer ends 8052 of two centrifugal blades 805 in the blade set are provided with the flow limiting plate 3. From the inner end 8051 to the outer end 8052, both of the flow limiting plates 3 gradually incline towards the fluid passage 8053.

[0035] By providing the flow limiting plate 3 at the outer end 8052 of each of the two adjacent centrifugal blades 805 and forming a necked structure with the two flow limiting plates 3, when the gas flows from the fluid passage 8053 into the necked structure, the gas is compressed due to the resistance, thereby increasing the concentration of methanol (impurities to be treated) and improving the treatment efficiency of the methanol.

[0036] Preferably, as shown in Figure 1 The catalyst is arranged on the side of the flow limiting plate 3 facing the fluid passage 8053.

[0037] By arranging the catalyst on the side of the flow limiting plate 3 facing the fluid passage, the concentrated gas after being pressurized can flow through the catalyst, thereby improving the efficiency of the oxidation of the impurities in the gas.

[0038] Further, the two centrifugal blades 805 with the two flow-restricting plates 3 forming the necked structure are parallel to each other, thereby improving the speed of the gas in the flow channel in the fluid passage 8053. Further, the two flow-restricting plates 3 have different lengths, thereby enabling the gas to flow through the longer flow-restricting plate 3 under the guidance of the relatively shorter flow-restricting plate 3 after flowing through the relatively shorter flow-restricting plate 3. In this way, the gas flows through different flow-restricting plates 3 in sequence, improving the probability of the impurities (methanol) contained in the gas contacting the catalyst on the flow-restricting plate 3, improving the oxidation efficiency of the methanol, and improving the efficiency of the harmless treatment of the methanol.

[0039] Preferably, as shown in Figure 1 the heating unit 1 is arranged as a vortex generator outside the casing, the casing 802 is made of a non-metal material, the flow-restricting plate 3 is made of a metal material, and the heating unit 1 can heat the flow-restricting plate 3. By arranging the vortex generator, the metal flow-restricting plate 3 is heated by the vortex generator, thereby heating the catalyst on the flow-restricting plate 3. On the one hand, the heating unit 1 is arranged outside the casing 802, which does not affect the rotation of the centrifugal blade 805; on the other hand, the flow-restricting plate 3 is heated first, and then the catalyst is heated by the flow-restricting plate 3, thereby improving the uniformity and stability of the heating of the catalyst; thirdly, the centrifugal blade 805 is rotated and heated by the vortex generator in sequence, thereby improving the uniformity of the temperature of the flow-restricting plate 3 on different centrifugal blades 805. Through the above three aspects, the stability of the catalyst temperature can be improved, thereby improving the oxidation efficiency of the catalyst for methanol.

[0040] The main body of the casing 802 of the centrifugal fan 801 is circular, and the vortex generator can be arranged radially outside the casing 802.

[0041] Further, the air purification device comprises a temperature monitoring unit for obtaining the temperature of the catalyst. The temperature monitoring unit comprises a temperature sensor 2 inserted into the non-metal casing 802 to measure the temperature near the flow-restricting plate 3, so as to feedback the working power of the vortex generator.

[0042] The vortex generator can be provided with two or more.

[0043] Preferably, as shown in Figure 1 the centrifugal fan 801 comprises a rotating shaft 9, and the centrifugal blade 805 is arranged on the rotating shaft 9; one end of the rotating shaft 9 is provided with a blind hole, and the rotating shaft 9 is provided with a through hole 901 communicating with the blind hole and the fluid passage 8053, and the opening of the blind hole constitutes the axial inlet 803.

[0044] By setting the rotating shaft 9, and setting the blind hole and the through hole 901 on the rotating shaft 9, when the rotating shaft 9 drives the centrifugal blade 805 to rotate, the air enters the blind hole from the opening (axial inlet 803) of the blind hole, and enters the fluid passage 8053 from the through hole 901 of the blind hole. Compared with the existing air entering the fluid passage 8053 from the axial inlet of the casing 802 to the inner end 8051 of the centrifugal blade 805, the application inhales air through the blind hole on the rotating shaft 9, which prolongs the flow path of the air in the fluid passage 8053. Since the path of the fluid passage 8053 is along the radial direction and flows towards the outer end 8052, the flow path in the fluid passage 8053 is longer, so that the speed of the air colliding with the flow limiting plate 3 (the speed when reaching the high pressure area 806) can be effectively improved. The higher the speed of the air reaching the high pressure area 806, the greater the pressure formed under the blockage of the flow limiting plate 3. The compression of the air in the high pressure area 806 is also larger. In this way, the concentration of impurities (methanol) in the air is improved. The higher the concentration of methanol, the more methanol that can react with the catalyst. In this way, the processing efficiency of methanol in the air is improved.

[0045] Preferably, as shown in Figure 1 two of the centrifugal blades (805) in the blade group constitute a centrifugal pipe, and the inner hole of the centrifugal pipe forms the fluid passage (8053), and the inlet of the centrifugal pipe is in sealed communication with the through hole (901).

[0046] In the radial direction of the rotating shaft 9, a circumferential flow channel is formed between the outer end 8052 and the inner circumferential surface of the casing 802.

[0047] Two of the centrifugal blades 805 in the blade group constitute a centrifugal pipe, and the inner hole of the centrifugal pipe forms the fluid passage 8053. When the gas flows in the blade group, it is equivalent to flowing in a pipe with only an inlet and an outlet. Since the inlet of the centrifugal pipe is in sealed communication with the through hole 901, the air discharged from the through hole 901 can only flow in the fluid passage 8053. This improves the air flow of the air entering the casing 802 through the flow limiting plate 3, and correspondingly improves the processing efficiency of the air entering the casing 802.

[0048] Preferably, as shown in Figure 1 The centrifugal fan is provided with a discharge pipe 7, the discharge pipe 7 is in communication with the circumferential outlet 804, the flow area of the discharge pipe 7 is smaller than the flow area of the circumferential outlet 804; and a cooling unit is arranged in thermal coupling with the discharge pipe 7.

[0049] The flow area on the discharge pipe 7 is smaller than the flow area of ​​the circumferential outlet 804. This causes the air (containing oxidized water vapor and carbon dioxide) discharged from the circumferential outlet 804 to be compressed as it flows from the circumferential outlet 804 into the discharge pipe 7, increasing the concentration of water vapor. Since the discharge pipe 7 is thermally coupled with a cooling unit, the air is cooled after flowing into the discharge pipe 7, and the water vapor condenses into a liquid state, making it easier for the water vapor to separate out.

[0050] Furthermore, a reduced transition pipe connection is provided between the circumferential outlet 804 and the discharge pipe 7.

[0051] Furthermore, the cooling unit includes a condensate coil 5 surrounding the drain pipe 7.

[0052] Preferred, such as Figure 1 As shown, a discharge branch pipe 6 is provided on the discharge pipe 7, and the cooling unit is located between the discharge branch pipe 6 and the circumferential outlet 804.

[0053] Furthermore, such as Figure 1 As shown, a filter screen 601 is provided above the discharge branch pipe. The filter screen 601 is inclined and gradually tilts downward along the flow direction of the gas in the discharge pipe 7. The lower side of the filter screen 601 is connected to the inner wall of the discharge branch pipe 6. Thus, when air carrying water droplets and solid impurities passes through filter screen 601, the solid particles and water droplets are filtered by filter screen 601 and adhere to it. Due to the inclined setting of filter screen 601, the air blows the solid particles and water droplets adhering to filter screen 601 along filter screen 601 to the lower right. Since the lower side of filter screen 601 is connected to the inner wall of discharge branch pipe 6, the solid particles and water flow along filter screen 601 to the lower right and enter the discharge branch pipe. In this way, some moisture and solid particles in the gas are filtered and collected, improving the quality of the gas discharged from discharge branch pipe 7, and improving the safety and quality of life and work for the crew. Since the solid particles and moisture adhering to filter screen 601 are blown into discharge branch pipe 6, filter screen 601 is cleaned, improving the filtration performance and service life of filter screen 601.

[0054] A water storage tank is installed below the discharge branch pipe 6, where filtered water and solid particles are collected.

[0055] This invention also provides a ship, including a methanol-fueled power system and the aforementioned air purification device, wherein the catalyst is capable of catalytically oxidizing methanol vapor into carbon dioxide and water within a preset temperature range.

[0056] By treating the impurities (methanol) in the pressurized air, first, the air purification device can purify the gas containing methanol molecules with large flow, large flow rate and low concentration, which is very suitable for the application scenario of the cabin of the methanol-powered ship, which requires large flow and rapid purification and the escaped methanol vapor concentration is low. Second, the centrifugal pressurization method is used to increase the methanol concentration in the gas, thereby promoting the catalytic reaction, which is beneficial to reduce the overall amount of catalyst and the amount of use of noble metal components. Third, the adjustable metal plate is arranged at the outer end 8052 of the centrifugal blade 805 to realize centrifugal pressurization, and the pressurization effect can be changed by adjusting the end angle (a adjusting device 4 is arranged between the flow limiting plate 3 and the centrifugal blade 805, for example, the flow limiting plate 3 and the centrifugal blade 805 are connected together through an adjustable hinge, the angle between the flow limiting plate 3 and the centrifugal blade 805 is changed through the hinge, and then the hinge is fixed to fix the angle), thereby adapting to different working conditions. Fourth, the purified product is carbon dioxide and water, which will not cause secondary pollution. Fifth, the vortex heating metal plate and the catalyst are used, the heating is more uniform, which is beneficial to ensure that the catalyst has higher utilization rate, realizes good catalytic effect and lower catalyst consumption. Sixth, the air purification device of the present application also has the function of removing particulate matter by centrifugation, which has the effect of removing dust, suspended short fibers and the like generated in the cabin. Seventh, the air purification device of the present application also has a secondary pressurization and dehumidification device to avoid water vapor entering the cabin. Those skilled in the art will readily understand that the advantageous technical features of the above-mentioned methods can be freely combined and superimposed without conflict.

[0057] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the technical principles of the present application, a number of improvements and modifications can be made, which should be regarded as the protection scope of the present application.

Claims

1. An air purification device comprising a centrifugal fan (801), the centrifugal fan (801) comprising a casing (802) having an axial inlet (803) and a circumferential outlet (804) forming a fluid path therebetween, a centrifugal blade (805) being disposed within the casing (802) and rotatable about a centre of rotation to enable gas external to the casing (802) to enter the fluid path from the axial inlet (803) and to flow from the circumferential outlet (804), characterised in that, The fluid path has a high-pressure area (806) therein, the pressure of the gas flowing through the high-pressure area (806) is greater than the pressure of the gas at the axial inlet (803); a catalyst is arranged in the high-pressure area (806), and the air purification device further comprises a heating unit (1) capable of heating the catalyst to a preset temperature range.

2. The air purification device of claim 1, wherein, Two adjacent centrifugal blades (805) form a blade group, the blade group forms a fluid passage (8053), the fluid path comprises the fluid passage (8053); the flow area of the inlet of the fluid passage (8053) is greater than the flow area of the outlet of the fluid passage (8053), and the catalyst is arranged at the outlet of the fluid passage (8053).

3. The air purification device of claim 2, wherein, The centrifugal blade (805) has an inner end (8051) close to the center of rotation and an outer end (8052) opposite to the inner end (8051); The outer end (8052) of at least one centrifugal blade (805) in the blade group is provided with a flow limiting plate (3), and the flow limiting plate (3) gradually inclines towards the fluid passage (8053) along the flow direction of the gas.

4. The air purification device of claim 3, wherein, The catalyst is arranged on the side of the flow limiting plate (3) facing the fluid passage (8053).

5. The air purification device of claim 3, wherein, The heating unit (1) is arranged as an eddy current generator outside the casing (802), the casing (802) is made of a non-metal material, the flow limiting plate (3) is made of a metal material, and the heating unit (1) can heat the flow limiting plate (3) when working.

6. The air purification device of claim 2, wherein, The centrifugal fan (801) comprises a rotating shaft (9), and the centrifugal blade (805) is arranged on the rotating shaft (9); one end of the rotating shaft (9) is provided with a blind hole, and the rotating shaft (9) is provided with a through hole (901) communicating the blind hole and the fluid passage (8053), and the opening of the blind hole constitutes the axial inlet (803).

7. The air purification device of claim 6, wherein, Two centrifugal blades (805) in the blade group constitute a centrifugal pipe, the inner hole of the centrifugal pipe forms the fluid passage (8053), and the inlet of the centrifugal pipe is in sealed communication with the through hole (901).

8. The air purification device according to any one of claims 1-7, characterized in that, The centrifugal fan is provided with a discharge pipe (7) in communication with the circumferential outlet (804), and the flow area of the discharge pipe (7) is smaller than that of the circumferential outlet (804); a cooling unit is arranged in thermal coupling with the discharge pipe (7).

9. The air purification device of claim 8, wherein, The discharge pipe (7) is provided with a discharge branch pipe (6), and the cooling unit is arranged between the discharge branch pipe (6) and the circumferential outlet (804).

10. A vessel characterised in that, The air purification device comprises a power system using methanol as fuel and any one of claims 1-9, and the catalyst can catalytically oxidize methanol vapor to carbon dioxide and water in a preset temperature range.

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