Cooling filter and hydrogen recovery system

Abstract

The utility model provides a cooling filter and a hydrogen recovery system.The cooling filter comprises a shell, an input port and an output port are formed in the shell, a heat exchange cavity is formed in the shell, a plurality of first channels are formed in the heat exchange cavity, and a first cavity and a second cavity are formed in the positions, located at the two ends of the heat exchange cavity, in the shell correspondingly; the input ends of the first channels communicate with the input port through the first cavity, the output ends of the first channels communicate with the output port through the second cavity, and the shell is further provided with a water inlet and a water outlet communicating with the heat exchange cavity. A filtering piece is arranged in the second cavity and is positioned between the output end of the first channel and the output port; the first channel is formed in the heat exchange cavity, hydrogen is introduced into the first channel, cooling water is introduced into the heat exchange cavity, the hydrogen is cooled, meanwhile, the filter part is arranged, ammonia mixed in the hydrogen can be crystallized and separated out on the filter part after being cooled, ammonium salt mixed in the hydrogen is fully filtered out, and a flowmeter or a gas conveying pipeline is prevented from being blocked.

Description

Technical Field

[0001] This application relates to the field of hydrogen recovery technology, and in particular to a cooling filter and a hydrogen recovery system. Background Technology

[0002] The hydrogen recovery and utilization system is designed to recover and reuse the remaining hydrogen in the reduction furnace. However, when the remaining hydrogen in the reduction furnace enters the hydrogen recovery system, it carries away the ammonium salts produced in the reduction furnace. Because the hydrogen coming out of the hydrogen recovery system is at a high temperature, the ammonium salts vaporize at high temperatures. When they re-enter the reduction furnace, the temperature drops, and the ammonium salts crystallize and precipitate in the pipes and flow meters, clogging the flow meters. Workers need to frequently disassemble and clean the flow meters, which increases the workload and reduces production efficiency. Utility Model Content

[0003] The purpose of this application is to address the above-mentioned problems by providing a cooling filter and a hydrogen recovery system.

[0004] In a first aspect, this application provides a cooling filter, comprising:

[0005] The outer casing has an inlet and an outlet, and an internal heat exchange chamber. The heat exchange chamber contains multiple first channels. The outer casing has a first chamber and a second chamber at each end of the heat exchange chamber. The input ends of the multiple first channels are connected to the inlet through the first chamber, and their output ends are connected to the outlet through the second chamber. The outer casing also has an inlet and an outlet connecting to the heat exchange chamber.

[0006] A filter element is disposed within the second cavity, located between the output ends of the plurality of first channels and the output port.

[0007] According to the technical solutions provided in certain embodiments of this application, a first tube sheet and a second tube sheet are provided inside the outer shell, and a heat exchange cavity is formed between the first tube sheet and the second tube sheet. The side of the first tube sheet away from the second tube sheet is surrounded by the inner wall of the outer shell to form the first cavity, and the side of the second tube sheet away from the first tube sheet is surrounded by the inner wall of the outer shell to form the second cavity. A plurality of heat exchange tubes are provided inside the heat exchange cavity, and the two ends of the plurality of heat exchange tubes are respectively fixed to the first tube sheet and the second tube sheet, and communicate with the first cavity and the second cavity. The heat exchange tubes have the first channel inside.

[0008] According to the technical solutions provided in certain embodiments of this application, the sum of the flow areas of the plurality of heat exchange tubes is greater than the flow area of ​​the inlet.

[0009] According to the technical solutions provided in certain embodiments of this application, the filter element is made of stainless steel.

[0010] According to the technical solutions provided in certain embodiments of this application, the outer casing includes a housing, and a first flange cover and a second flange cover are detachably connected to both ends of the housing.

[0011] According to the technical solutions provided in certain embodiments of this application, one end of the housing is fixed with a plurality of legs.

[0012] According to the technical solutions provided in certain embodiments of this application, the housing is provided with the inlet and the outlet, the inlet is located on the end of the housing near the outlet, and the outlet is located on the end of the housing near the inlet.

[0013] Secondly, this application provides a hydrogen recovery system, including a cooling filter as described above, and further including a reduction furnace, a recovery device, and a refrigeration device. The output end of the reduction furnace is connected to the input end of the recovery device. The output end of the recovery device is connected to two of the input ports through a first three-way valve. The two output ports are connected to the input end of the reduction furnace through a second three-way valve. The input end and output end of the refrigeration device are connected to the water outlet and the water inlet, respectively.

[0014] Compared with the prior art, the beneficial effects of this application are as follows: This application provides a cooling filter and a hydrogen recovery system. The cooling filter includes a shell with an inlet and an outlet. It has an internal heat exchange chamber with multiple first channels. The shell has a first chamber and a second chamber at each end of the heat exchange chamber. The inlet of the multiple first channels is connected to the inlet through the first chamber, and the outlet is connected to the outlet through the second chamber. The shell also has an inlet and an outlet connecting to the heat exchange chamber. A filter element is installed in the second chamber, located between the outlet and the outlet of the multiple first channels. By setting multiple first channels inside the heat exchange chamber, hydrogen is introduced into the multiple first channels through the inlet, while cooling water is introduced into the heat exchange chamber through the inlet to cool the hydrogen. Simultaneously, the filter element in the second chamber allows ammonia mixed in the hydrogen to crystallize and precipitate on the filter element after cooling, thereby effectively filtering out ammonium salts mixed in the hydrogen and preventing blockage of the flow meter or gas pipeline.

[0015] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a cooling filter provided in Embodiment 1 of this application;

[0018] Figure 2 This is a cross-sectional schematic diagram of a cooling filter provided in Embodiment 1 of this application.

[0019] The text labels in the image represent:

[0020] 1. Outer shell; 2. Filter element; 11. First tube sheet; 12. Second tube sheet; 13. Heat exchange tube; 14. Shell; 15. First flange cover; 16. Second flange cover; 17. Support leg; 101. Inlet; 102. Outlet; 103. First cavity; 104. Second cavity; 105. Water inlet; 106. Water outlet. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The descriptions in this section are merely illustrative and explanatory, and should not be construed as limiting the scope of protection of this application. Specifically, the described embodiments are only some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort should fall within the scope of protection of this invention.

[0022] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0023] Example 1

[0024] As mentioned in the background section, in order to solve the problems existing in the prior art, this embodiment provides a cooling filter, including:

[0025] The outer casing 1 has an inlet 101 and an outlet 102. It has a heat exchange chamber inside, which has multiple first channels. The outer casing 1 has a first cavity 103 and a second cavity 104 at both ends of the heat exchange chamber. The input ends of the multiple first channels are connected to the inlet 101 through the first cavity 103, and their output ends are connected to the outlet 102 through the second cavity 104. The outer casing 1 also has a water inlet 105 and a water outlet 106 that connect to the heat exchange chamber.

[0026] Filter element 2 is disposed in the second cavity 104 and located between the output end of the multiple first channels and the output port 102.

[0027] like Figure 1 and Figure 2 As shown, the outer shell 1 is approximately a cylindrical structure with its axis extending vertically. The heat exchange chamber is located inside the outer shell 1. The upper and lower ends of the heat exchange chamber are a second chamber 104 and a first chamber 103, respectively. An inlet 101 is provided on the outer shell 1 at the position corresponding to the first chamber 103, and an outlet 102 is provided at the position corresponding to the second chamber 104. An inlet 105 and an outlet 106 are also provided on the outer shell 1 at the positions corresponding to the heat exchange chamber, for the cooling water cooled by the refrigeration device to pass through the heat exchange chamber. The heat exchange chamber also has multiple first channels for connecting... The first chamber 103 and the second chamber 104 are connected; the filter element 2 has a mesh structure, and its outer periphery is tightly attached to the inner wall of the outer shell 1. The hydrogen recovered by the hydrogen recovery device enters the first chamber 103 through the inlet 101, and then enters the second chamber 104 through multiple first channels. When passing through the first channel, it exchanges heat with the cooling water in the heat exchange chamber, releasing heat and cooling down. At this time, the ammonia mixed in the hydrogen begins to be converted into crystallized salt due to the temperature. When passing through the filter element 2, the ammonium salt crystallizes and precipitates on the filter element 2. The filtered hydrogen enters the reduction furnace through the outlet 102.

[0028] By setting multiple first channels inside the heat exchange chamber, hydrogen gas is introduced into the multiple first channels through the inlet 101, while cooling water is introduced into the heat exchange chamber through the inlet 105 to cool the hydrogen gas. At the same time, a filter element 2 is set in the second chamber 104 so that ammonia gas mixed in the hydrogen gas can crystallize and precipitate on the filter element 2 after cooling, thereby fully filtering out the ammonium salt mixed in the hydrogen gas and avoiding clogging of the flow meter or gas transmission pipeline.

[0029] In a preferred embodiment, the outer shell 1 is provided with a first tube sheet 11 and a second tube sheet 12, and a heat exchange cavity is formed between the first tube sheet 11 and the second tube sheet 12. The side of the first tube sheet 11 away from the second tube sheet 12 is surrounded by the inner wall of the outer shell 1 to form a first cavity 103, and the side of the second tube sheet 12 away from the first tube sheet 11 is surrounded by the inner wall of the outer shell 1 to form a second cavity 104. A plurality of heat exchange tubes 13 are provided in the heat exchange cavity. The two ends of the plurality of heat exchange tubes 13 are respectively fixed on the first tube sheet 11 and the second tube sheet 12 and communicate with the first cavity 103 and the second cavity 104. The heat exchange tubes 13 have a first channel inside.

[0030] like Figure 2 As shown, the first tube sheet 11 and the second tube sheet 12 have the same structure, both being circular metal plates with multiple through holes evenly distributed on them. Their outer contours match the inner contours of the outer shell 1. The first tube sheet 11 and the second tube sheet 12 are fixed vertically to the inner wall of the outer shell 1, dividing the internal space of the outer shell 1 into three cavities: from top to bottom, the second cavity 104, the heat exchange cavity, and the first cavity 103. Multiple heat exchange tubes 13 are fixedly connected between the first tube sheet 11 and the second tube sheet 12. The two ends of each heat exchange tube 13 correspond to and are connected to multiple through holes on the first tube sheet 11 and the second tube sheet 12 respectively. Cooling water can flow in the space formed between the first tube sheet 11 and the second tube sheet 12, between the outer wall of the heat exchange tube 13 and the inner wall of the outer shell 1. Hydrogen enters the first cavity 103 through the inlet 101, enters the second cavity 104 after passing through multiple heat exchange tubes 13, and finally exits through the outlet 102. When hydrogen passes through the heat exchange tube 13, it can exchange heat with the cooling water, release heat and reduce the temperature.

[0031] In a preferred embodiment, the sum of the flow areas of the plurality of heat exchange tubes 13 is greater than the flow area of ​​the inlet 101.

[0032] like Figure 2 As shown, since the sum of the flow areas of the multiple heat exchange tubes 13 is greater than the flow area of ​​the inlet 101, the flow rate of hydrogen will decrease after entering the multiple heat exchange tubes 13, which can fully exchange heat with the cooling water and at the same time avoid pressure loss.

[0033] In a preferred embodiment, the filter element 2 is made of stainless steel.

[0034] like Figure 2 As shown, the use of stainless steel to make filter element 2 can prevent hydrogen from being mixed with other impurities when it flows through filter element 2, thus ensuring the purity of hydrogen.

[0035] In a preferred embodiment, the outer casing 1 includes a housing 14, with a first flange cover 15 and a second flange cover 16 detachably connected to both ends of the housing 14.

[0036] like Figure 1 As shown, the shell 14 is approximately a cylindrical tube structure with openings at both ends. The first flange cover 15 and the second flange cover 16 are respectively closed on the two openings and detachably connected to the shell 14. By setting the detachably connected first flange cover 15 and second flange cover 16, it is convenient to replace the filter element 2 after disassembly. At the same time, the heat exchange tube 13, which is arranged in the vertical direction, can also be easily cleaned after the two flange covers are removed to remove ammonium salt crystals on the heat exchange tube 13, avoid clogging the inside of the filter, and enable the cooling filter to be reused multiple times.

[0037] In a preferred embodiment, a plurality of legs 17 are fixed to one end of the housing 14.

[0038] like Figure 1 As shown, three support legs 17 are fixed at one end of the housing 14 near the first cavity 103 to support the housing 1, so that there is a gap between the housing 1 and the ground, which facilitates the removal of the first flange cover 15.

[0039] In a preferred embodiment, the housing 14 is provided with an inlet 101 and an outlet 102, with an inlet 105 located on the housing 14 near the outlet 102 and an outlet 106 located on the housing 14 near the inlet 101.

[0040] like Figure 1 As shown, hydrogen flows upward in multiple heat exchange tubes 13, while cooling water flows downward in the heat exchange chamber. By exchanging heat through the countercurrent flow of hydrogen and cooling water, a large temperature difference can be maintained between the two during the heat exchange process, thereby improving the heat exchange efficiency.

[0041] Example 2

[0042] This embodiment provides a hydrogen recovery system, including a cooling filter as described in Embodiment 1, and further including a reduction furnace, a recovery device, and a refrigeration device. The output end of the reduction furnace is connected to the input end of the recovery device. The output end of the recovery device is connected to two input ports 101 through a first three-way valve. The two output ports 102 are connected to the input end of the reduction furnace through a second three-way valve. The input end and output end of the refrigeration device are connected to the water outlet 106 and the water inlet 105, respectively.

[0043] By installing two parallel cooling filters between the output of the recovery device and the input of the reduction furnace, and controlling the on / off state of the two cooling filters using a first three-way valve and a second three-way valve, the first three-way valve connects the output of the recovery device to the input port 101 of the first cooling filter, and the second three-way valve connects the input of the reduction furnace to the output port 102 of the first cooling filter. The first cooling filter filters the ammonium salt mixed in the hydrogen. When a large amount of ammonium salt crystals precipitate in the first cooling filter, the first and second three-way valves are adjusted so that the first three-way valve connects the output of the recovery device to the input port 101 of the second cooling filter, and the second three-way valve connects the input of the reduction furnace to the output port 102 of the second cooling filter. At this time, the first cooling filter can be disassembled and cleaned to remove the ammonium salt crystals. Through the above settings, the cleaning cycle can be extended, the reduction furnace does not need to be stopped during the cleaning process, and the normal operation of production is not affected, which greatly improves production efficiency.

[0044] Working principle: During use, the inlet 101 is connected to the output end of the recovery device, the output port 102 is connected to the input end of the reduction furnace, and the inlet 105 and outlet 106 are respectively the output and input ends of the cooling device, so that the cooling water circulates between the two. The hydrogen gas processed by the recovery device enters the first chamber 103 through the inlet 101, and then enters the second chamber 104 through multiple first channels. When passing through the first channel, it exchanges heat with the cooling water in the heat exchange chamber, releasing heat and cooling down. At this time, the ammonia gas mixed in the hydrogen gas begins to be converted into crystal salt under the influence of temperature. When passing through the filter element 2, the ammonium salt crystallizes and precipitates on the filter element 2. The filtered hydrogen gas then enters the reduction furnace through the output port 102.

[0045] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A cooling filter, characterized by, The application relates to a cooling filter. The shell (1) is internally provided with a first tube plate (11) and a second tube plate (12), the first tube plate (11) and the second tube plate (12) form the heat exchange cavity, the side, away from the second tube plate (12), of the first tube plate (11) is combined with the inner wall of the shell (1) to form the first cavity (103), the side, away from the first tube plate (11), of the second tube plate (12) is combined with the inner wall of the shell (1) to form the second cavity (104); the heat exchange cavity is internally provided with a plurality of heat exchange pipes (13), the two ends of the plurality of heat exchange pipes (13) are correspondingly fixed on the first tube plate (11) and the second tube plate (12) respectively, and the heat exchange pipes (13) are connected with the first cavity (103) and the second cavity (104); the heat exchange pipes (13) are internally provided with the first channels. The sum of the flow areas of the plurality of heat exchange pipes (13) is greater than the flow area of the input port (101).

2. A cooling filter according to claim 1, characterised in that The filter (2) is made of stainless steel.

3. A cooling filter according to claim 2, wherein The shell (1) comprises a shell body (14), and the two ends of the shell body (14) are detachably connected with a first flange cover (15) and a second flange cover (16).

4. A cooling filter according to claim 1, wherein The shell body (14) is fixed with a plurality of supporting legs (17) at one end.

5. A cooling filter according to claim 1, wherein The input port (101) and the output port (102) are arranged on the shell body, the water inlet (105) is arranged on one end of the shell body (14) close to the output port (102), and the water outlet (106) is arranged on one end of the shell body (14) close to the input port (101).

6. A cooling filter according to claim 5, wherein The application further relates to a cooling filter comprising the cooling filter according to any one of claims 1-7, a reduction furnace, a recycling device and a refrigeration device, the output end of the reduction furnace is connected with the input end of the recycling device, the output end of the recycling device is connected with two input ports (101) through a first three-way valve, two output ports (102) are connected with the input end of the reduction furnace through a second three-way valve, and the input end and the output end of the refrigeration device are connected with the water outlet (106) and the water inlet (105) respectively.

7. A cooling filter according to claim 5, wherein ​ 8. A hydrogen recovery system characterized by, ​

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