Hydrogen production silicon carbide demisting precision filter

Abstract

The utility model relates to a hydrogen production silicon carbide demisting precision filter, and relates to the field of gas filters, the hydrogen production silicon carbide demisting precision filter comprises a filter tank and a filter element, the filter tank is a closed tank body, the filter element is arranged in the filter tank, the filter element is made of a silicon carbide membrane tube, the filter element is of a cylindrical structure, a plurality of through holes are formed in the filter element, and a channel for gas to pass through is formed; the filter tank is connected with an air inlet pipe and an air outlet pipe. The gas filtering equipment has the effect that the blockage degree of the gas filtering equipment can be reduced during high-flux filtering.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas filters, in particular to a hydrogen production silicon carbide demisting precision filter. BACKGROUND

[0002] In the process of hydrogen production by electrolysis of water, the hydrogen gas leaving the gas-liquid separation tank is cooled by heat exchange with circulating cooling water, and after leaving the heat exchanger, the hydrogen gas is cooled to about 40°C. At this time, the hydrogen gas contains saturated moisture at the corresponding temperature and a small amount of liquid mist entrained, and the hydrogen gas needs to be dried and demisted.

[0003] The existing gas filtering equipment includes a filter tank and a filter core. The filter tank is a closed tank body, and the filter core is arranged in the filter tank. The filter core is made of metal wire mesh or metal sintered mesh. The filter core has a plurality of passages with small cross-sectional areas. When the gas passes through the passages in the filter core, the liquid droplets adhere to the inner wall of the passages, so that the water vapor in the gas forms liquid droplets. The metal wire mesh is arranged in multiple layers, and the liquid droplets accumulated on the metal wire mesh can flow under the action of gravity, so that the liquid droplets can be accumulated in the filter tank. The user periodically discharges the liquid water in the filter tank to achieve the effect of filtering the gas.

[0004] The related technical solutions in the above have the following defects: once the liquid droplets become large, the surface tension of the liquid droplets and the binding force between the filtering passages are formed, so that the liquid blocks the passages on the metal wire mesh, the resistance of the gas flowing through the filtering equipment increases, the flow rate of the gas flow decreases, and the filtering efficiency decreases. Utility model content

[0005] In order to reduce the degree of blockage of the gas filtering equipment during high-flux filtration, the present application provides a hydrogen production silicon carbide demisting precision filter.

[0006] The hydrogen production silicon carbide demisting precision filter provided by the present application adopts the following technical solutions:

[0007] A hydrogen production silicon carbide demisting precision filter includes a filter tank and a filter core. The filter tank is a closed tank body, and the filter core is arranged in the filter tank. The filter core is made of a silicon carbide membrane tube. The filter core has a cylindrical structure, a plurality of through holes are formed on the filter core to form passages for the gas to pass through, and the filter tank is connected with an air inlet pipe and an air outlet pipe.

[0008] By adopting the technical scheme, when the filter tank is filled with gas through the gas inlet pipe, the gas needs to flow in the channel of the filter core to flow out of the gas outlet pipe, and the gas contacts the surface of the filter core when flowing in the channel of the filter core, so that the filter core can absorb water vapor in the gas to achieve the effect of drying the gas. The filter core is made of silicon carbide material, and the silicon carbide has a certain water absorption capacity and can absorb water. When the humid gas flows in the channel of the filter core, the probability of the channel being blocked by liquid droplets and forming a water film is low. When a large amount of gas passes through the filter core, the probability of the channel in the filter core being blocked is low, so that the filter core can maintain a high filtering efficiency.

[0009] Optionally, the filter core is provided with a honeycomb structure.

[0010] By adopting the technical scheme, when the filter core is provided with a honeycomb structure, the contact area of the gas with the filter core is large when the gas flows in the channel of the filter core, so that the filter core with a small volume can have a large filtering efficiency, and the volume of the filter can be reduced.

[0011] Optionally, the height-to-diameter ratio of the filter core is 1000: (1.5-2).

[0012] By adopting the technical scheme, when the height-to-diameter ratio of the filter core is too low, the cross section of the filter core is too large, and at this time, the gas flowing in the channel of the filter core is difficult to fully contact the filter core, and the filter core is difficult to completely absorb the water vapor in the gas. When the height-to-diameter ratio of the filter core is too high, the cross-sectional area of the channel in the filter core is too small. When the gas contacts the filter core and the filter core absorbs water, water is likely to accumulate in the channel of the filter core, and the probability of the water blocking the channel of the filter core is high, which reduces the filtering efficiency of the filter core.

[0013] Optionally, the gas inlet pipe is arranged below the filter tank, and the gas outlet pipe is arranged above the filter tank.

[0014] By adopting the technical scheme, the gas inlet pipe is arranged below the filter tank, and the gas outlet pipe is arranged above the filter tank. When hydrogen is introduced into the filter tank, the hydrogen can flow upward in the filter tank and be discharged from the gas outlet pipe due to the low density of the hydrogen, so that the flow speed of the hydrogen in the filter tank is high, the filtering efficiency is improved, and after the hydrogen is filtered, the hydrogen in the filter tank can be automatically discharged from the gas outlet pipe, thereby reducing the probability of hydrogen accumulation in the filter tank and improving the safety in use.

[0015] Optionally, the filter core is provided in a plurality of filter cores, the plurality of filter cores are spliced with each other and arranged in the filter tank, the hole diameter of the filter core located at the upper side of the filter tank is large, and the hole diameter of the filter core located at the lower side of the filter tank is small.

[0016] By adopting the technical scheme, the filter cartridges are arranged in the filter tank, the cross-sectional areas of the channels on the filter cartridges are different, when the humid hydrogen enters the lower bottom of the filter tank, the filter cartridge with fine channels filters the hydrogen, so that more water vapor in the hydrogen is left in the filter cartridge, when the hydrogen passes through the lower filter cartridge and enters the upper filter cartridge, the hydrogen contains less water, less water vapor can be filtered out, and the filter cartridge with a larger hole is used for filtering, so that the filtering cost can be saved.

[0017] Optionally, the filter tank is provided with a mounting plate, a mounting hole is formed in the middle of the mounting plate, the mounting hole is coaxially arranged with the filter tank, and the filter cartridge is arranged in the mounting hole.

[0018] By adopting the technical scheme, the filter cartridges are arranged in the filter tank, the cross-sectional areas of the channels on the filter cartridges are different, when the humid hydrogen enters the lower bottom of the filter tank, the filter cartridge with fine channels filters the hydrogen, so that more water vapor in the hydrogen is left in the filter cartridge, when the hydrogen passes through the lower filter cartridge and enters the upper filter cartridge, the hydrogen contains less water, less water vapor can be filtered out, and the filter cartridge with a larger hole is used for filtering, so that the filtering cost can be saved.

[0019] Optionally, an upper inclined surface is formed in the upper side of the inner wall of the filter tank, and a lower inclined surface is formed in the lower bottom of the inner wall of the filter tank.

[0020] By adopting the technical scheme, when the filter tank is filled with hydrogen, the hydrogen can move along the upper inclined surface and flow out of the gas outlet pipe, so that the probability of hydrogen accumulation in the filter tank is reduced, when the water vapor in the filter tank forms droplets, the droplets can flow along the lower inclined surface and be discharged from the water outlet pipe, so that the probability of liquid water accumulation in the filter tank is reduced.

[0021] Optionally, a condenser pipe is arranged on the filter tank, and the condenser pipe is horizontally arranged and penetrates through the filter tank.

[0022] By adopting the technical scheme, the condenser pipe is arranged in the filter tank, and cooling circulating water is introduced into the condenser pipe, so that the temperature of the condenser pipe is low, when the gas containing water vapor exchanges heat with the condenser pipe, the water vapor can be condensed and forms liquid water, so that the effect of drying the gas is further achieved.

[0023] In summary, the beneficial technical effects of the present application are:

[0024] 1. The application is a hydrogen production silicon carbide demisting precision filter. The filter tank is provided with a vertical filter core. When the filter tank is filled with gas through the air inlet pipe, the gas needs to flow through the channel in the filter core to flow out through the air outlet pipe. When the gas flows through the channel in the filter core, the gas contacts the surface of the filter core, so that the filter core can absorb the water vapor in the gas, achieving the effect of drying the gas. By using silicon carbide material to make the filter core, silicon carbide has a certain water absorption capacity and can absorb moisture. When the humid gas flows through the channel in the filter core, the probability of liquid droplets accumulating in the channel and forming a water film to block the channel is low. When a large amount of gas passes through the filter core, the probability of the channel in the filter core being blocked is low, so that the filter core can maintain a high filtering efficiency.

[0025] 2. The filter core is arranged in a honeycomb structure. When the gas flows through the channel in the filter core, the contact area between the gas and the filter core is large, so that the filter core with small volume can have high filtering efficiency, and the volume of the filter can be reduced.

[0026] 3. When the height and diameter ratio of the filter core is too low, the cross section of the filter core is too large. At this time, the gas entering the channel of the filter core is difficult to fully contact the filter core, and the filter core is difficult to completely absorb the water vapor in the gas. When the height and diameter ratio of the filter core is too high, the cross section area of the channel in the filter core is too small. When the gas contacts the filter core and the filter core absorbs moisture, the channel in the filter core is prone to accumulate moisture, and the probability of the moisture blocking the channel of the filter core is high, causing the filtering efficiency of the filter core to decrease. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the overall structure schematic diagram of the embodiment of the application.

[0028] Figure 2 It is the overall sectional view of the embodiment of the application.

[0029] Figure 3 It is the structure schematic diagram of the filter core of the embodiment of the application.

[0030] The drawings show that: 1, filter tank; 11, air inlet pipe; 12, air outlet pipe; 13, water outlet pipe; 14, mounting plate; 141, mounting hole; 15, upper inclined surface; 16, lower inclined surface; 2, filter core; 3, condenser pipe. DETAILED DESCRIPTION

[0031] The application will be further described in detail below with reference to the drawings.

[0032] The embodiment of the application discloses a hydrogen production silicon carbide demisting precision filter, which refers to Figure 1 , Figure 2 and Figure 3, including filter tank 1 and filter core 2, filter tank 1 is a closed container, filter tank 1 is made of metal material with better structural strength, filter core 2 is installed in filter tank 1. The filter tank 1 is connected with the inlet pipe 11 and the outlet pipe 12, the humid hydrogen enters the filter tank 1 through the inlet pipe 11, the hydrogen flows through the filter core 2 in the filter tank 1 and is discharged from the outlet pipe 12. The filter core 2 uses silicon carbide membrane tube to support, the filter core 2 is vertically arranged in the filter tank 1, the humid hydrogen flows through the hole in the filter core 2, the silicon carbide has water absorption, which can absorb the water vapor in the humid gas, so as to achieve the effect of drying gas.

[0033] Referring to Figure 1 and Figure 2 , the inlet pipe 11 is arranged at the lower bottom of the filter tank 1, and the outlet pipe 12 is connected to the upper top of the filter tank 1. When the humid hydrogen enters the filter tank 1, the hydrogen has a small density and can be automatically discharged from the outlet pipe 12, thereby reducing the probability of hydrogen accumulation in the filter tank 1, reducing the probability of hydrogen combustion and explosion, and improving the safety of dry hydrogen.

[0034] Referring to Figure 1 and Figure 2 , the lower bottom of the filter tank 1 is communicated with the water outlet pipe 13, and the water valve is arranged on the water outlet pipe 13. When the filter core 2 absorbs more water, the water flows downward in the filter core 2 under the action of gravity and accumulates, thereby enabling the water in the filter core 2 to gather to form droplets. After the droplets flow to the bottom of the filter tank 1, the user can discharge the droplets out of the filter tank 1 through the water outlet pipe 13.

[0035] Referring to Figure 1 and Figure 2 , the filter tank 1 is provided with a mounting plate 14, the mounting plate 14 is horizontally fixed in the middle of the filter tank 1, and the inlet pipe 11 and the outlet pipe 12 are respectively located on both sides of the mounting plate 14. The mounting plate 14 is provided with a mounting hole 141 in the middle, the mounting hole 141 is coaxial with the filter tank 1, and the filter core 2 is vertically inserted into the mounting hole 141. When the hydrogen enters the filter tank 1 from the inlet pipe 11, the hydrogen is located below the mounting plate 14, and the hydrogen needs to pass through the filter core 2 in the process of flowing to the outlet pipe 12, thereby enabling the filter core 2 to achieve the effect of drying gas.

[0036] Referring to Figure 1 and Figure 2 , an upper inclined surface 15 is arranged in the upper side of the filter tank 1, and the hydrogen can rise along the upper inclined surface 15 in the process of flowing and be discharged from the outlet pipe 12, thereby reducing the probability of hydrogen remaining in the filter tank 1. A lower inclined surface 16 is arranged in the lower side of the filter tank 1, and when liquid water is formed at the lower bottom of the filter core 2 and the inner wall of the filter tank 1, the liquid water can accumulate at the bottom of the filter tank 1 under the action of gravity and flow along the lower inclined surface 16 to the water outlet pipe 13, thereby reducing the probability of liquid water accumulation in the filter tank 1.

[0037] Referring to Figure 3The filter core 2 is in a cylindrical structure, a plurality of through holes are formed in the filter core 2, and the through holes pass through the filter core 2. The cross section of the filter core 2 can be provided as a honeycomb structure, so as to further increase the area of the contact surface between the air and the filter core 2. The height-to-diameter ratio of the filter core 2 is 1000:1.5-2. When the height of the filter core 2 is small, the humid air is difficult to fully contact the filter core 2, the hydrogen gas has a small density and flows fast in the filter core 2, and the drying effect is poor when the length of the filter core 2 is small. When the diameter of the filter core 2 is too small, the cross section area of each channel in the filter core 2 is small, and when the absorbed water is accumulated in the channel, the liquid water forms a water film in the channel through surface tension, thereby causing the channel in the filter core 2 to be blocked, so that the flow rate of the humid gas in the filter core 2 is low, and the drying gas efficiency is affected.

[0038] With reference to Figure 2 and Figure 3 In other embodiments, a plurality of filter cores 2 can be spliced with each other and form a cylinder. When the plurality of filter cores 2 are arranged in the filter tank 1, the filter core 2 located at the lower bottom is provided with a through hole with a smaller diameter, and the filter core 2 located at the upper top is provided with a through hole with a larger diameter. When the humid gas flows in the filter tank 1, the humid gas vertically rises in the filter core 2. At this time, the water content of the gas above in the filter tank 1 is low, and the water content of the gas below in the filter tank 1 is high. The gas with a high water content flows in the filter core 2 with dense through holes, so that the contact surface between the air and the filter core 2 is large, the water absorption efficiency of the filter core 2 is high, the air on the upper side of the filter tank 1 is dry, and the filter core 2 with sparse holes can be used for filtering. The production difficulty of the silicon carbide membrane tube with fine and dense holes is high, and the cost is high. By using the filter cores 2 with different hole densities to be combined and arranged in the filter tank 1, the cost of the drying gas can be saved.

[0039] With reference to Figure 1 The filter tank 1 is provided with a plurality of condenser pipes 3. The condenser pipes 3 are arranged between the air outlet pipe 12 and the mounting plate 14, are horizontally arranged and pass through the filter tank 1, and are provided with cooling circulating water. The temperature of the condenser pipes 3 is low. When the hydrogen gas contacts the condenser pipes 3, the water vapor mixed in the hydrogen gas can be cooled and condensed into liquid drops, so as to further achieve the drying gas effect.

[0040] The implementation principle of the embodiment of the present application is that the filter core 2 is arranged in the filter tank 1. When the gas is introduced into the filter tank 1, the gas enters the filter tank 1 from the air inlet pipe 11 and is discharged from the air outlet pipe 12. The gas flows in contact with the filter core 2. The filter core 2 is made of silicon carbide material, so as to achieve the effect of absorbing the water vapor in the gas, thereby achieving the effect of drying the gas.

[0041] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A precision silicon carbide demisting filter for hydrogen production, characterized in that: It includes a filter canister (1) and a filter element (2). The filter canister (1) is a sealed canister. The filter element (2) is placed inside the filter canister (1). The filter element (2) is made of silicon carbide membrane tube. The filter element (2) has a cylindrical structure. Multiple through holes are opened on the filter element (2) to form a channel for gas to pass through. An air inlet pipe (11) and an air outlet pipe (12) are connected to the filter canister (1).

2. The hydrogen-producing silicon carbide demisting precision filter according to claim 1, characterized in that: The cross-section of the filter element (2) is set as a honeycomb structure.

3. The hydrogen-producing silicon carbide demisting precision filter according to claim 2, characterized in that: The height to diameter ratio of the filter element (2) is 1000:(1.5-2).

4. The hydrogen-producing silicon carbide demisting precision filter according to claim 1, characterized in that: The air inlet pipe (11) is located below the filter canister (1), and the air outlet pipe (12) is located above the filter canister (1).

5. The hydrogen-producing silicon carbide demisting precision filter according to claim 4, characterized in that: The filter element (2) is configured as multiple, and the multiple filter elements (2) are spliced ​​together and installed in the filter canister (1). The filter element (2) located on the upper side of the filter canister (1) has a larger hole diameter, and the filter element (2) located on the lower side of the filter canister (1) has a smaller hole diameter.

6. The hydrogen-producing silicon carbide demisting precision filter according to claim 5, characterized in that: The filter canister (1) is provided with an installation plate (14), and an installation hole (141) is provided in the middle of the installation plate (14). The installation hole (141) is coaxially arranged with the filter canister (1). The filter element (2) is arranged in the installation hole (141). The installation plate (14) is located between the air inlet pipe (11) and the air outlet pipe (12).

7. The hydrogen-producing silicon carbide demisting precision filter according to claim 1, characterized in that: The filter tank (1) has an upper inclined surface (15) on the upper side of its inner wall, and a water outlet pipe (13) is connected to the bottom of the filter tank (1). The filter tank (1) also has a lower inclined surface (16) on the bottom of its inner wall.

8. The hydrogen-producing silicon carbide demisting precision filter according to claim 1, characterized in that: The filter tank (1) is provided with a condenser pipe (3), which is horizontally arranged and penetrates the filter tank (1).

Images