Low-pressure air inlet forced adsorption type hydrogen drying device and hydrogen drying system

Abstract

The utility model discloses a low-pressure air inlet forced adsorption type hydrogen drying device and a hydrogen drying system, the hydrogen drying device comprises a first dryer and a second dryer which are arranged in parallel, and air blowers are respectively arranged on air inlet pipelines of the first dryer and the second dryer; a first dryer air inlet pipe connector of the first four-way valve and a second dryer air inlet pipe connector of the first four-way valve are connected with air inlet pipelines of the first dryer and the second dryer respectively. A first dryer air outlet pipe connector and a second dryer air outlet pipe connector of the second four-way valve are respectively connected with air outlet pipelines of the first dryer and the second dryer; the regeneration cooler and the gas-water separator are connected in series, a cooler inlet of the regeneration cooler is connected with a cooler connector of the second four-way valve through a pipeline, and a gas outlet of the gas-water separator is connected with a separator connector of the first four-way valve through a pipeline. And low-pressure hydrogen can be dried.

Description

Technical Field

[0001] This utility model relates to the field of drying technology, specifically to a low-pressure intake forced adsorption hydrogen drying device and a hydrogen drying system. Background Technology

[0002] A traditional two-tower drying unit consists of Drying Tower 1, Drying Tower 2, a regeneration cooler, and a filter. The operating states of the drying unit can be subdivided as follows: Drying Tower 1 regenerating while Drying Tower 2 is operating; Drying Tower 1 standby while Drying Tower 2 is operating; Drying Tower 1 operating while Drying Tower 2 is regenerating; Drying Tower 1 operating while Drying Tower 2 is standby. The entire drying unit operates in a cyclical manner, with a working cycle of 48 hours. Specifically, the time spent in both Drying Tower 1 regenerating and Drying Tower 2 operating and standby while Drying Tower 1 is operating while Drying Tower 2 is regenerating and working while Drying Tower 1 is operating while Drying Tower 2 is standby is 24 hours. The following description uses the examples of Drying Tower 1 regenerating while Drying Tower 2 is operating and Drying Tower 1 standby while Drying Tower 2 is operating as an example to illustrate the operation of a traditional two-tower drying unit:

[0003] Drying tower 1 regenerates drying tower 2 in operation: Hydrogen gas enters drying tower 1 from the top via a pneumatic three-way ball valve and a pneumatic four-way ball valve.

[0004] Hydrogen gas is heated by an electric heater inside drying tower one and then passes through a molecular sieve. The heat carried by the gas regenerates the molecular sieve. The regenerated gas flows through the regeneration gas outlet of drying tower one and then through a regeneration cooler. In the regeneration cooler, most of the water carried in the hydrogen gas is cooled, separated from the gas, and settles at the bottom of the regeneration cooler. The separated hydrogen gas enters drying tower two through the working gas inlet. After the water is adsorbed by the molecular sieve, it flows out of drying tower two through the working gas outlet and is sent to the second pneumatic three-way ball valve through a pneumatic four-way ball valve and a filter (the function of the filter is to remove dust from the hydrogen gas). A dew point meter and a hydrogen purity meter are installed before the second pneumatic three-way ball valve to analyze the water content and purity of the hydrogen gas. If the hydrogen dew point or purity does not meet the requirements, the hydrogen gas is vented through the second pneumatic three-way ball valve. Hydrogen gas with qualified dew point and purity enters the next stage through the second pneumatic three-way ball valve.

[0005] Drying Tower 1 Standby, Drying Tower 2 in Operation: After the regeneration of Drying Tower 1 is completed, the drying unit automatically switches to the "Drying Tower 1 Standby, Drying Tower 2 in Operation" state. At this time, the hydrogen gas separated by the regeneration cooler enters Drying Tower 2 through the working gas inlet via the pneumatic three-way ball valve and the regeneration cooler. After the water is adsorbed by the molecular sieve, it flows out of Drying Tower 2 through the working gas outlet and is sent to the second pneumatic three-way ball valve via the pneumatic four-way ball valve and the filter (the function of the filter is to remove dust from the hydrogen gas). A dew point meter and a hydrogen purity meter are installed before the second pneumatic three-way ball valve to analyze the water content and purity of the hydrogen gas. If the hydrogen dew point or purity does not meet the requirements, the hydrogen gas is vented through the second pneumatic three-way ball valve. Hydrogen gas with qualified dew point and purity enters the next stage through the second pneumatic three-way ball valve.

[0006] However, the aforementioned traditional two-tower hydrogen drying device requires medium-pressure hydrogen with an inlet pressure of 1.6 MPa or 3.2 MPa for the first drying tower, and is not suitable for drying low-pressure hydrogen.

[0007] In view of the above shortcomings, it is necessary to design a low-pressure intake forced adsorption hydrogen drying device and a hydrogen drying system. Utility Model Content

[0008] Therefore, the technical problem to be solved by this utility model is that the existing two-tower drying device cannot dry low-pressure hydrogen, so as to provide a low-pressure inlet forced adsorption hydrogen drying device and hydrogen drying system.

[0009] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0010] A low-pressure forced adsorption hydrogen drying device includes a first dryer and a second dryer connected in parallel, with blowers installed on the inlet pipes of the first and second dryers respectively. The device also includes a first four-way valve and a second four-way valve. The first and second dryer inlet ports of the first four-way valve are respectively connected to the inlet pipes of the first and second dryers, respectively. The first and second dryer outlet ports of the second four-way valve are respectively connected to the outlet pipes of the first and second dryers, respectively. The device further includes a regenerator and a gas-water separator. The outlet of the regenerator is connected to the inlet of the gas-water separator via a pipe. The inlet of the regenerator is connected to the cooler port of the second four-way valve via a pipe. The gas outlet of the gas-water separator is connected to the separator port of the first four-way valve via a pipe.

[0011] Furthermore, it also includes a water collector, and the condensate outlet of the gas-water separator is connected to the water collector via a pipeline.

[0012] Furthermore, it also includes a hydrogen input pipeline, which is connected to the inlet port of the first four-way valve.

[0013] Furthermore, it also includes a hydrogen output pipeline, which is connected to the outlet port of the second four-way valve.

[0014] Furthermore, it also includes a control module, which is electrically connected to the first four-way valve and the second four-way valve.

[0015] Furthermore, both the first dryer and the second dryer include a regeneration working state and a drying working state; the control module controls the air inlet of the first four-way valve to be connected to the air inlet of the first dryer, and the air outlet of the second four-way valve to be connected to the air outlet of the first dryer, so that the first dryer enters the drying working state; accordingly,

[0016] The control module controls the separator interface of the first four-way valve to be connected to the air inlet interface of the second dryer, and the air outlet interface of the second four-way valve to be connected to the cooler interface, so that the second dryer enters the regeneration working state.

[0017] Furthermore, the control module controls the air inlet of the first four-way valve to connect with the air inlet of the second dryer, and the air outlet of the second four-way valve to connect with the air outlet of the second dryer, so that the second dryer enters the drying working state; accordingly,

[0018] The control module controls the separator interface of the first four-way valve to be connected to the air inlet interface of the first dryer, and the air outlet interface of the first dryer of the second four-way valve to be connected to the cooler interface, so that the first dryer enters the regeneration working state.

[0019] The technical solution of this utility model has the following advantages:

[0020] 1. The low-pressure intake forced adsorption type hydrogen drying device provided by this utility model includes a first dryer and a second dryer arranged in parallel, and blowers are respectively installed on the intake pipes of the first dryer and the second dryer. Therefore, the hydrogen entering the drying system can be pressurized by the blowers so that the hydrogen drying device can dry the low-pressure hydrogen and at the same time provide circulation power for the hydrogen in the regeneration system.

[0021] 2. The low-pressure forced adsorption hydrogen drying device provided by this utility model includes a first dryer and a second dryer, both of which have regeneration and drying states. The control module controls the inlet port of the first four-way valve to connect with the inlet pipe port of the first dryer, and the outlet port of the second four-way valve to connect with the outlet pipe port of the first dryer, thus putting the first dryer into the drying state. Correspondingly, the control module controls the separator port of the first four-way valve to connect with the inlet pipe port of the second dryer, and the outlet pipe port of the second four-way valve to connect with the cooler port, thus putting the second dryer into the regeneration state. The inlet pipe interface is connected, and the outlet interface of the second four-way valve is connected to the outlet interface of the second dryer, enabling the second dryer to enter the drying working state. Correspondingly, the control module controls the separator interface of the first four-way valve to be connected to the inlet interface of the first dryer, and the outlet interface of the first dryer of the second four-way valve to be connected to the cooler interface, enabling the first dryer to enter the regeneration working state. In this way, the first and second dryers can be switched and activated alternately in the drying working state and the regeneration working state, shortening the regeneration cycle, improving the hydrogen regeneration effect, and ensuring that hydrogen can be fully regenerated. Furthermore, the drying system and the circulation system are two completely isolated systems, ensuring the safety of the system.

[0022] A hydrogen drying system includes the aforementioned low-pressure inlet forced adsorption type hydrogen drying device.

[0023] The technical solution of this utility model has the following advantages:

[0024] The hydrogen drying system provided by this utility model has all the advantages of the aforementioned low-pressure inlet forced adsorption hydrogen drying device. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the low-pressure air intake forced adsorption type hydrogen drying device in the embodiment of this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. First dryer; 2. Second dryer; 3. First four-way valve; 31. Air inlet; 32. First dryer air inlet pipe interface; 33. Second dryer air inlet pipe interface; 34. Separator interface; 4. Second four-way valve; 41. Air outlet; 42. First dryer air outlet pipe interface; 43. Second dryer air outlet pipe interface; 44. Cooler interface; 5. Regenerative cooler; 6. Air-water separator; 7. Blower. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0033] Example 1

[0034] When drying low-pressure (typically 0.6 to 0.7 MPa in a drying tower) hydrogen, a power source is needed to power the hydrogen. To address this, a low-pressure forced adsorption hydrogen drying device has been specifically designed, such as... Figure 1As shown, the hydrogen drying device includes a first dryer 1 and a second dryer 2 connected in parallel, and blowers 7 are respectively installed on the inlet pipes of the first dryer 1 and the second dryer 2.

[0035] Furthermore, it also includes a first four-way valve 3 and a second four-way valve 4. The first dryer air inlet port 32 and the second dryer air inlet port 33 of the first four-way valve 3 are respectively connected to the air inlet pipes of the first dryer 1 and the second dryer 2. The first dryer air outlet port 42 and the second dryer air outlet port 43 of the second four-way valve 4 are respectively connected to the air outlet pipes of the first dryer 1 and the second dryer 2.

[0036] Furthermore, it also includes a regenerator 5 and a gas-water separator 6. The cooler outlet of the regenerator 5 is connected to the separator inlet of the gas-water separator 6 through a pipeline. The cooler inlet of the regenerator 5 is connected to the cooler interface 44 of the second four-way valve 4 through a pipeline. The gas outlet of the gas-water separator 6 is connected to the separator interface 34 of the first four-way valve 3 through a pipeline.

[0037] Furthermore, it also includes a water collector (not shown), and the condensate outlet of the gas-water separator 6 is connected to the water collector via a pipeline.

[0038] Furthermore, it also includes a hydrogen input pipeline drying tower 1, which is connected to the inlet port 31 of the first four-way valve 3.

[0039] Furthermore, it also includes a hydrogen output pipeline drying tower two, which is connected to the outlet port 41 of the second four-way valve 4.

[0040] Furthermore, it also includes a control module (not shown), specifically a programmable logic controller. The control module is electrically connected to the first four-way valve 3 and the second four-way valve 4, and is used to control the conduction of different interfaces on the first four-way valve 3 and the second four-way valve 4.

[0041] The first dryer 1 and the second dryer 2 in this utility model both include a regeneration working state and a drying working state. When the first dryer 1 is in the drying working state, the second dryer 2 is in the regeneration working state. The specific process is as follows:

[0042] The control module controls the inlet 31 of the first four-way valve 3 to connect with the inlet 32 ​​of the first dryer, and the outlet 41 of the second four-way valve 4 to connect with the outlet 42 of the first dryer, so that the first dryer 1 enters the drying working state (the first dryer 1 and the corresponding pipelines form a drying system). This allows the raw material hydrogen to flow along the hydrogen input pipeline to drying tower one, and then enter the first dryer 1 through inlet 31 and the first dryer inlet 32 ​​along the inlet pipeline. The hydrogen dried in the first dryer 1 flows along the outlet pipeline of the first dryer 1, and then enters the hydrogen output pipeline to drying tower two through the outlet 42 and outlet 41. Simultaneously, the control module controls the separator 34 of the first four-way valve 3 to connect with the inlet 33 of the second dryer. The second dryer outlet port 43 of the second four-way valve 4 is connected to the cooler port 44, allowing the second dryer 2 to enter the regeneration working state (the second dryer 2, regeneration cooler 5, gas-water separator 6, and corresponding pipelines form a regeneration system). The blower 7 on the inlet pipe of the second dryer 2 pressurizes and recirculates the hydrogen in the regeneration system, allowing the hydrogen in the regeneration system to be drawn upwards and heated by the electric heating of the second dryer 2, and blows out the moisture adsorbed by the desiccant in the previous cycle. The hot hydrogen gas containing water vapor is then fed into the regeneration cooler 5 through the second dryer outlet port 43 and the cooler port 44 to cool and remove water, and then enters the gas-water separator 6 for condensate separation. The separated hydrogen gas re-enters the second dryer 2 through the separator port 34 and the second dryer inlet port 33 for regeneration.

[0043] When the first dryer 1 is saturated and regeneration is required, the second dryer 2 is switched for drying. During the gas path switching, there will be residual gas in the first dryer 1, and this part of the gas will be used for regeneration. The specific process is as follows:

[0044] The control module controls the inlet 31 of the first four-way valve 3 to connect with the inlet 33 of the second dryer, and the outlet 41 of the second four-way valve 4 to connect with the outlet 43 of the second dryer, so that the second dryer 2 enters the drying working state (the second dryer 2 and the corresponding pipelines form a drying system). This allows the raw material hydrogen to flow along the hydrogen input pipeline to the first drying tower, and then enter the second dryer 2 through the inlet 31 and the second dryer inlet 33 along the inlet pipeline. After being dried in the second dryer 2, the hydrogen flows along the outlet pipeline of the second dryer 2, and then enters the second drying tower through the outlet 43 and the outlet 41 of the second dryer. Simultaneously, the control module controls the separator 34 of the first four-way valve 3 to connect with the inlet 32 ​​of the first dryer. The first dryer outlet port 42 of the second four-way valve 4 is connected to the cooler port 44, allowing the first dryer 1 to enter the regeneration working state. The blower 7 on the inlet pipe of the first dryer 1 pressurizes and circulates the hydrogen in the regeneration system (the first dryer 1, the regeneration cooler 5, the gas-water separator 6, and the corresponding pipelines form the regeneration system). The hydrogen in the regeneration system is drawn upward and heated by the electric heating of the second dryer 2, and the moisture adsorbed by the desiccant in the previous cycle is blown out. The hot hydrogen gas with water vapor is fed into the regeneration cooler 5 through the first dryer outlet port 42 and the cooler port 44 to cool and remove water, and then enters the gas-water separator for condensate separation. The separated hydrogen gas enters the first dryer 1 again through the separator port 34 and the first dryer inlet port 32 for regeneration.

[0045] The technical solution of this utility model has the following advantages:

[0046] The low-pressure forced adsorption hydrogen drying device provided by this utility model includes a first dryer 1 and a second dryer 2 connected in parallel, with blowers 7 installed on the inlet pipes of the first dryer 1 and the second dryer 2 respectively. Therefore, the hydrogen entering the drying system can be pressurized by the blowers, allowing the hydrogen drying device to dry low-pressure hydrogen. Simultaneously, it can provide circulating power for the hydrogen in the regeneration system, enabling the hydrogen drying device to dry low-pressure hydrogen. Since the first dryer 1 and the second dryer 2 alternately switch between drying and regeneration states, the regeneration time interval can be shortened, thereby improving the hydrogen regeneration effect and ensuring sufficient hydrogen regeneration. Furthermore, the drying system and the regeneration system are two completely isolated systems, ensuring system safety. Furthermore, the low-pressure forced adsorption hydrogen drying device provided by this utility model uses a blower 7 to provide the hydrogen flow power for the regeneration system, which can meet the requirement of zero emission loss in the circulation of regeneration gas within the regeneration system. A programmable logic controller (PLC) controls the first four-way valve 3 and the second four-way valve 4, which can automatically control the working process of the hydrogen drying device, achieving the goal of fully automatic unattended operation. In addition, the blower 7 used in this embodiment is small in size and light in weight, and has environmentally friendly characteristics of low noise and low vibration, while generating high air pressure and air volume to ensure that the hydrogen humidity drops rapidly in a short period of time.

[0047] Example 2

[0048] A hydrogen drying system includes the low-pressure inlet forced adsorption type hydrogen drying device (such as the one described in Example 1) Figure 1 (As shown).

[0049] The technical solution of this utility model has the following advantages:

[0050] The hydrogen drying system provided by this utility model has all the advantages of the aforementioned low-pressure inlet forced adsorption hydrogen drying device.

[0051] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A hydrogen drying device of low-pressure intake forced adsorption, characterized by, The hydrogen drying device comprises a first dryer (1) and a second dryer (2) arranged in parallel, and a blower (7) is arranged on the air inlet pipeline of the first dryer (1) and the second dryer (2) respectively; the hydrogen drying device further comprises a first four-way valve (3) and a second four-way valve (4), the first dryer air inlet pipe interface (32) and the second dryer air inlet pipe interface (33) of the first four-way valve (3) are connected to the air inlet pipelines of the first dryer (1) and the second dryer (2) respectively, and the first dryer air outlet pipe interface (42) and the second dryer air outlet pipe interface (43) of the second four-way valve (4) are connected to the air outlet pipelines of the first dryer (1) and the second dryer (2) respectively; the hydrogen drying device further comprises a regenerative cooler (5) and a gas-water separator (6), the cooler outlet of the regenerative cooler (5) is connected to the separator inlet of the gas-water separator (6) through a pipeline, the cooler inlet of the regenerative cooler (5) is connected to the cooler interface (44) of the second four-way valve (4) through a pipeline, and the gas outlet of the gas-water separator (6) is connected to the separator interface (34) of the first four-way valve (3) through a pipeline.

2. The hydrogen gas drying device according to claim 1, wherein A water collector is further included, and the condensed water outlet of the gas-water separator (6) is connected to the water collector through a pipeline.

3. The hydrogen gas drying device according to claim 1, wherein A hydrogen input pipeline is further included, and the hydrogen input pipeline is connected to the air inlet interface (31) of the first four-way valve (3).

4. The hydrogen gas drying device according to claim 3, wherein A hydrogen output pipeline is further included, and the hydrogen output pipeline is connected to the air outlet interface (41) of the second four-way valve (4).

5. The hydrogen gas drying device according to claim 4, wherein A control module is further included, and the control module is electrically connected to the first four-way valve (3) and the second four-way valve (4).

6. The hydrogen gas drying device according to claim 5, wherein The first dryer (1) and the second dryer (2) each comprise a regeneration working state and a drying working state; the control module controls the air inlet interface (31) of the first four-way valve (3) to be conductive to the first dryer air inlet pipe interface (32), and the air outlet interface (41) of the second four-way valve (4) to be conductive to the first dryer air outlet pipe interface (42), so that the first dryer (1) enters the drying working state; correspondingly, the control module controls the separator interface (34) of the first four-way valve (3) to be conductive to the second dryer air inlet pipe interface (33), and the second dryer air outlet pipe interface (43) of the second four-way valve (4) to be conductive to the cooler interface (44), so that the second dryer (2) enters the regeneration working state.

7. The hydrogen gas drying device according to claim 6, wherein The control module controls the first four-way valve (3) to be in communication with the second dryer inlet pipe interface (33) through the inlet interface (31), and controls the second four-way valve (4) to be in communication with the second dryer outlet pipe interface (43) through the outlet interface (41), so that the second dryer (2) enters the drying working state; correspondingly, the control module controls the first four-way valve (3) to be in communication with the first dryer inlet pipe interface (32) through the separator interface (34), and controls the second four-way valve (4) to be in communication with the cooler interface (44) through the first dryer outlet pipe interface (42), so that the first dryer (1) enters the regeneration working state.

8. A hydrogen drying system, characterized by, The low-pressure inlet forced adsorption type hydrogen drying device comprises the low-pressure inlet forced adsorption type hydrogen drying device according to any one of claims 1-7.

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