A water gas separation integrated module for a dual stack system

Abstract

The application provides a water-gas separation integrated module for a double electric pile system, and belongs to the technical field of new energy sources.The double electric pile system comprises a circulating pipeline gas supply module, a double pile integrated fuel cell module and a water-gas separation integrated module; the circulating pipeline gas supply module is connected with the double pile integrated fuel cell module; the double pile integrated fuel cell module is connected with the water-gas separation integrated module; and the water-gas separation integrated module is connected with the circulating pipeline gas supply module.Two sets of water-gas separation systems are integrated into one set of water-gas separation integrated module, the integration degree is improved, the number of components is reduced, the miniaturization and light weight are realized, the separation efficiency is effectively improved, resource waste is reduced, energy is saved, and the problem that too many interfaces caused by too many components increase hydrogen leakage and cause safety hazards can be avoided.The water-gas separation integrated module adopts a two-stage separation structure.

Description

TECHNICAL FIELD

[0001] The application provides a water-gas separation integrated module for a double stack system, and belongs to the technical field of new energy. BACKGROUND

[0002] A hydrogen fuel cell is a new type of energy technology that uses hydrogen as fuel and can convert the chemical energy of hydrogen into electrical energy. Hydrogen fuel cells have high efficiency, environmental friendliness, and other advantages, and can be used in automotive power, household power generation, ship power, and other fields. Technically, hydrogen fuel cells involve hydrogen separation technology, stack design technology, and development of battery control systems, and are a complex technology. At present, research institutions at home and abroad are closely following the development of hydrogen fuel cell technology, and hope that it can become a sustainable alternative energy source.

[0003] With the progress of the electrochemical reaction of the hydrogen fuel cell, water is continuously generated in the stack and is discharged out of the stack with the mixed gas. Unreacted hydrogen is also discharged. To improve the utilization rate of hydrogen, the mixed gas after reaction is sent into the stack again through a hydrogen circulation pump or an ejector. To avoid water flooding failure of the stack caused by too high water content in the mixed gas entering the stack, a water-gas separation system is arranged at the outlet of the stack. A fuel cell system adopting a double stack integration scheme needs to be equipped with two sets of water-gas separation systems, which are large in volume and weight. When two stack outlets are introduced into a single water-gas separation system at the same time, the separation efficiency is low. SUMMARY

[0004] The application provides a water-gas separation integrated module for a double stack system to solve the problems of large volume and weight of the existing stack and low separation efficiency.

[0005] The application provides a double stack system, which comprises a circulating pipeline gas supply module, a double stack integrated fuel cell module, and a water-gas separation integrated module; characterized in that: the circulating pipeline gas supply module is connected with the double stack integrated fuel cell module; the double stack integrated fuel cell module is connected with the water-gas separation integrated module; and the water-gas separation integrated module is connected with the circulating pipeline gas supply module.

[0006] Preferably, the double stack integrated fuel cell module comprises a stack A and a stack B.

[0007] Preferably, the circulating pipeline gas supply module comprises a hydrogen circulation pump, an ejector, and a pipeline through which gas can circulate.

[0008] Preferably, the hydrogen circulation pump / ejector, the double stack integrated fuel cell module, and the water-gas separation integrated module are connected through the pipeline.

[0009] The application provides a water-gas separation integrated module, which comprises a water-gas separation tank, a water discharge valve and an exhaust valve, the water-gas separation tank comprises a first water-gas separator and a second water-gas separator, the first water-gas separator comprises a first water-gas separator-stack A and a first water-gas separator-stack B, the water discharge valve comprises a first water discharge valve and a second water discharge valve, the first water discharge valve is connected with the first water-gas separator, the second water discharge valve is connected with the second water-gas separator, and the exhaust valve is connected with the water-gas separation tank.

[0010] Preferably, the second water-gas separator is connected with a hydrogen circulation pump.

[0011] Preferably, baffles are arranged at mixed gas inlets of the first water-gas separator and the second water-gas separator, and vortex devices are arranged at lower ends of the baffles.

[0012] Preferably, a pressure sensor is arranged at an upper end of the exhaust valve.

[0013] The application has the advantages that: the water-gas separation integrated module for the double-electric pile system integrates two sets of water-gas separation systems into one set of water-gas separation integrated module, improves the integration degree, reduces the number of components, realizes the miniaturization and light weight, can effectively improve the separation efficiency, reduce resource waste, save energy, and can also avoid the problem that too many interfaces caused by too many components increase the risk of hydrogen leakage and cause safety hazards. The water-gas separation integrated module adopts a two-stage separation structure, the first separation structure is small in size and meets the primary separation requirements of respective corresponding electric piles, the second separation structure is large in size and meets the further separation requirements after the first separation, can reduce the occupied space of the system, save the cost and improve the overall performance of the system. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 A prior art diagram of the double-electric pile system of the application;

[0015] Figure 2 An improved diagram of the double-electric pile system of the application;

[0016] Figure 3 A perspective view of the water-gas separation integrated module of the application;

[0017] Figure 4 A front view of the water-gas separation integrated module of the application;

[0018] Figure 5 A sectional view of the water-gas separation integrated module of the application;

[0019] Among them, Figure 3Fig. 1 shows a schematic diagram of a dual stack system according to an embodiment of the present application, wherein: 1, pressure sensor; 2, primary water-gas separator stack A; 3, exhaust valve; 4, secondary water-gas separator; 5, primary water drain valve; 6, primary water-gas separator stack B; 7, gas outlet; 8, secondary water drain valve; 9, gas inlet 1; 10, gas inlet 2. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present application will be described hereinafter with reference to the accompanying drawings, in which, it should be understood that the preferred embodiments described herein are intended for the purpose of illustration and explanation only, and are not intended to limit the present application in any manner.

[0021] One embodiment of the present application, as shown in Fig. 1, provides a dual stack system, which includes a circulation pipeline gas supply module, a dual stack integrated fuel cell module, and a water-gas separation integrated module; the circulation pipeline gas supply module is connected to the dual stack integrated fuel cell module to provide the dual stack integrated fuel cell module with in-stack mixed gas for reaction; the dual stack integrated fuel cell module is connected to the water-gas separation integrated module to provide the water-gas separation integrated module with mixed gas after reaction; the water-gas separation integrated module is connected to the circulation pipeline gas supply module to input the mixed gas after reaction into the circulation pipeline gas supply module again. Figure 2

[0022] The dual stack integrated fuel cell module includes stack A and stack B, and the dual stack integrated fuel cell module converts the in-stack mixed gas into electricity and water through stack A and stack B.

[0023] The circulation pipeline gas supply module includes a hydrogen circulation pump / eductor and a pipeline for circulation of gas.

[0024] The hydrogen circulation pump / eductor, the dual stack integrated fuel cell module, and the water-gas separation integrated module are connected through the pipeline.

[0025] The working principle of the above technical solution is as follows: mixed gas mainly composed of hydrogen and oxygen enters the dual stack integrated fuel cell module through the eductor and the upper and lower pipelines to react with stack A and stack B in the dual stack integrated fuel cell module; when the stacks are working, hydrogen and oxygen are respectively distributed to the bipolar plates of each single cell through the stack gas passages, and are uniformly distributed to the electrodes through the bipolar plates, and then contact the catalyst through the electrode support body to perform electrochemical reaction, generating water and electricity, and storing the generated electricity in the dual stack fuel cell module; then the mixed gas after reaction and the generated water enter the water-gas separation integrated module through the pipeline for further water-gas separation, and the separated water and hydrogen are discharged through the exhaust valve 3 and the water drain valve, respectively, and the mixed gas that is not completely separated is re-input into the hydrogen circulation pump from the water-gas separation integrated module through the pipeline, and the above operation is repeated to perform water-gas separation operation.

[0026] ​The technical scheme has the effects that: the double stack system includes a circulating pipeline gas supply module, a double stack integrated fuel cell module and a water-gas separation integrated module, the system can realize higher energy output efficiency and more stable working state by integrating different functional modules, improve separation efficiency and reduce the number of components, realize the miniaturization and light weight goal; the circulating pipeline gas supply module is connected with the double stack integrated fuel cell module, provides the mixed gas for reaction into the double stack integrated fuel cell module, thereby guaranteeing the normal operation of the electric pile, and can realize the fuel cell working state of high efficiency, stability, energy saving and environmental protection; the double stack integrated fuel cell module is connected with the water-gas separation integrated module, provides the mixed gas after reaction for the water-gas separation integrated module, effectively improves the energy conversion efficiency of the double stack integrated fuel cell module, reduces the influence on the environment, and realizes the maximization of resource utilization; the water-gas separation integrated module is connected with the circulating pipeline gas supply module, the mixed gas which is not completely separated by water and gas is input into the circulating pipeline gas supply module again for separation, thereby improving the hydrogen utilization rate. The double stack integrated fuel cell module includes an electric pile A and an electric pile B, the double stack integrated fuel cell module converts the mixed gas into electric energy and water through the electric pile A and the electric pile B, improves the energy conversion efficiency, and will not produce pollutants or waste, will not cause the influence on the environment and save the use of energy resources. The circulating pipeline gas supply module includes a hydrogen circulating pump / eductor and a pipeline for circulating gas flow, the hydrogen circulating pump / eductor can make the hydrogen uniformly distributed in the electric pile, improve the reaction efficiency and stability, and the circulating pipeline for circulating gas flow can realize the recycling and reaction of resources. The hydrogen circulating pump / eductor, the double stack integrated fuel cell module and the water-gas separation integrated module are connected through the pipeline, the stability of gas flow can be maintained: through the pipeline connection, the stability of hydrogen and other gas flow in the circulation process can be ensured, and the reduction of reaction efficiency and stability caused by flow fluctuation is avoided. The uniformity of hydrogen distribution can be improved: the circulating pump / eductor can uniformly distribute the hydrogen into the electric pile, so that the reaction area realizes more uniform chemical reaction, and the electric pile reaction efficiency, stability and service life are improved. The pipeline control and management are facilitated: through the pipeline connection, the pressure, flow rate and other parameters in the circulation process can be monitored and controlled in real time, and the management personnel can perform pipeline maintenance, fault elimination and other operations.

[0027] One embodiment provided by the present application is as follows: Figure 3As shown, a water-gas separation integrated module includes a water-gas separation tank, a drain valve and an exhaust valve 3, the water-gas separation tank includes a primary water-gas separator and a secondary water-gas separator 4, the drain valve includes a primary drain valve 5 and a secondary drain valve 8; the primary water-gas separator discharges separated water through the primary drain valve 5, the secondary water-gas separator 4 further separates water-gas that is not completely separated by the primary water-gas separator; the gas separated by the primary water-gas separator and the secondary water-gas separator 4 is collected in the water-gas separation tank and discharged through the exhaust valve 3.

[0028] The working principle of the above technical solution is that: the mixed gas after the reaction of the stacks A and B of the double-stack integrated fuel cell module enters the primary water-gas separator-stack A 2 and the secondary water-gas separator-stack B 6 through the pipeline; the primary water-gas separator-stack A and the secondary water-gas separator-stack B 6 receive the incoming mixed gas and perform water-gas separation operation thereon; the separated water is directly discharged through the primary drain valve 5, the separated hydrogen enters the water-gas separation tank through the primary water-gas separator-stack A 2 and the primary water-gas separator-stack B 6, the mixed gas that is not completely separated enters the secondary water-gas separator 4 through the pipeline, the secondary water-gas separator 4 performs water-gas separation on the incoming mixed gas, the separated water is discharged through the secondary drain valve 8, the separated hydrogen enters the water-gas separation tank through the secondary water-gas separator 4 and then combines with the gas in the water-gas separation tank, which is discharged through the exhaust valve 3, the secondary water-gas separator 4 then transmits the mixed gas that is not completely separated to the hydrogen circulation pump / eductor through the pipeline again to perform further separation operation.

[0029] The effect of the above technical scheme is that: a water-gas separation integrated module, comprising a water-gas separation tank, a drain valve and an exhaust valve 3, the water-gas separation tank comprising a first water-gas separator and a second water-gas separator 4, the drain valve comprising a first drain valve 5 and a second drain valve 8, by integrating two sets of water-gas separation systems into one set of water-gas separation integrated module, the integration degree is improved, the number of components is reduced, the miniaturization and light weight are realized, the water-gas separation integrated module adopts a two-stage separation structure, the first separation structure is small in size and meets the primary separation requirement of the corresponding stack, and the second separation structure is large in size and meets the further separation requirement after the first separation; the first water-gas separator discharges the separated water through the first drain valve 5, the second water-gas separator 4 further separates the water-gas that is not completely separated by the first water-gas separator, and discharges the separated water through the second drain valve 8, the drain valve can discharge water to ensure the normal operation of the system, protect the equipment and prolong the service life of the equipment, and avoid water from entering the circulating pipeline to cause blockage or damage to the system; the hydrogen separated by the first water-gas separator and the second water-gas separator 4 is discharged through the exhaust valve 3, so as to avoid the gas from accumulating in the water-gas separation tank and affecting the normal operation of the system.

[0030] One embodiment of the present application provides a system as shown in Figure 2 Figure 5 The first water-gas separator comprises a first water-gas separator stack A2 and a first water-gas separator stack B6, the first water-gas separator stack A2 and the first water-gas separator stack B6 are connected with a stack A and a stack B through a circulating loop respectively, and the primary separation requirement of the corresponding stack is met.

[0031] The second water-gas separator 4 is connected with a hydrogen circulating pump / eductor, and the mixed gas that is not completely separated is introduced into the double-stack system through the hydrogen circulating pump / eductor again to perform water-gas separation.

[0032] A baffle is arranged at the mixed gas inlet of the first water-gas separator and the second water-gas separator 4, and a vortex device is arranged at the lower end of the baffle. The first water-gas separator and the second water-gas separator 4 both adopt the baffle separation / blocking separation and vortex separation / centrifugal separation principles, so as to ensure the separation efficiency.

[0033] The working principle of the above technical solution is as follows: the mixed gas after reaction enters the first water-gas separator-stacks A and B 6 through the stacks A and B respectively, and when the water and the gas enter the first water-gas separator stacks A 2 and B 6, they first encounter the obstruction of the baffle. In this process, the gas can more easily pass through the baffle and enter the water-gas separation tank through the first water-gas separator stacks A 2 and B 6, while the water is intercepted inside and discharged through the first drain valve 5. Then, the remaining water and gas enter the vortex area and are subjected to the action of forced guiding to form a vortex. In this process, the gas is more likely to move outward and leave the first water-gas separator stacks A 2 and B 6 to enter the water-gas separation tank, while the water is more likely to deposit in the central area and be discharged through the first drain valve 5. Then, the mixed gas that is not completely separated by the first water-gas separator stacks A 2 and B 6 enters the second drain valve 8 through the pipeline, and is further separated by the separation mode of baffle separation / blocking separation & vortex separation / centrifugal separation, and the separated gas is stored in the water-gas separation tank, and the separated water is discharged through the second drain valve 8. The second water-gas separator 4 inputs the mixed gas that is not completely separated into the hydrogen circulation pump / eductor again for water-gas separation, thereby ensuring the separation efficiency.

[0034] The effect of the above technical solution is that the first water-gas separator stacks A 2 and B 6 are connected with the stacks A and B through the circulation loop to complete the primary separation requirement of the corresponding stack, and the circulation pipeline can ensure the stability and controllability of the mixed gas entering the water-gas separator. When the gas flows through the circulation pipeline, a part of heat can be transferred to the water-gas separator through heat transfer, thereby improving the energy utilization rate of the equipment. The second water-gas separator 4 is connected with the hydrogen circulation pump / eductor to input the mixed gas that is not completely separated into the double-stack system again through the hydrogen circulation pump / eductor for water-gas separation, thereby improving the energy utilization rate. The first and second water-gas separators 4 both adopt the baffle separation / blocking separation & vortex separation / centrifugal separation principle, which can increase the separation efficiency of the water-gas separator, effectively improve the purity of hydrogen, and reduce the flow rate of the gas, so that the water vapor is more easily condensed and precipitated, thereby avoiding the further transmission of pollutants, ensuring the stability and reliability of the stack operation, and the design scheme of the baffle separation / blocking separation & vortex separation / centrifugal separation has the advantages of simple structure, easy maintenance, etc.

[0035] One embodiment of the present application is shown in FIG. 1. Figure 3 As shown in FIG. 1, the upper end of the exhaust valve 3 is provided with a pressure sensor 1 for monitoring the pipeline pressure at the outlet of the exhaust valve 3 to control the opening and closing of the subsequent exhaust valve 3.

[0036] The working principle of the above technical solution is as follows: after the pressure sensor 1 is installed on the exhaust valve 3, when the gas flow in the water-gas separation tank causes the gas pressure inside the water-gas separation tank to change, the pressure sensor 1 detects this change and converts it into an electrical signal. Then these electrical signals are sent to a program designed for the pressure sensor 1 and the control system for processing and analysis, and corresponding control commands are generated. The corresponding control commands and their working principle include: 1. Pressurization command: according to the pressure data obtained by the sensor, a pressurization command is generated by the algorithm program to drive the hydraulic system to perform pressurization operation; 2. Depressurization command: according to the pressure data obtained by the sensor and the set value, a depressurization command is generated by the algorithm program to drive the hydraulic system to perform depressurization operation; 3. Alarm command: when the sensor detects an abnormal situation, an alarm command is generated by the algorithm program to notify relevant personnel for processing; 4. Maintenance command: when the equipment needs maintenance, the corresponding instructions are generated by the algorithm program to notify relevant personnel for maintenance operation; 5. Timing control command: according to the set schedule, the corresponding control instructions are generated by the algorithm program for timing operation, etc.

[0037] The effect of the above technical solution is that the pressure sensor 1 is installed on the upper end of the exhaust valve 3, which can monitor the pressure of gas emission in real time, preventing dangerous or failure caused by excessive or insufficient exhaust. Through the monitoring of the pressure sensor 1, the opening and closing of the exhaust valve 3 can be controlled to ensure that the gas emission meets reasonable standards and targets. The pressure sensor 1 can provide accurate data feedback to help optimize equipment operation efficiency and reduce emission costs. In the case of increasingly stringent environmental regulation requirements, the installation of the pressure sensor 1 combined with the automatic control system can achieve precise management and control of gas emission, pressure and other parameters.

[0038] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A dual-stack fuel cell system, comprising a circulating pipeline gas supply module, a dual-stack integrated fuel cell module, and a water-gas separation integrated module; characterized in that: The circulating pipeline gas supply module is connected to the dual-stack integrated fuel cell module; the dual-stack integrated fuel cell module is connected to the water-gas separation integrated module; the mixed gas after the reaction of stack A in the dual-stack fuel cell module enters the first-stage water-gas separator-stack A through the pipeline; the mixed gas after the reaction of stack B in the dual-stack fuel cell module enters the first-stage water-gas separator-stack B through the pipeline, and the water produced after the reaction is discharged through the first-stage drain valve; the gas after the reaction of the first-stage water-gas separator-stack A and the first-stage water-gas separator-stack B enters the second-stage water-gas separator through the pipeline, producing gas and water. The water produced is discharged through the second-stage drain valve, and the gas produced enters the hydrogen circulation pump / ejector through the pipeline to obtain the in-stack mixed gas, and then returns to stack A and stack B through the upper and lower pipelines respectively.

2. The dual-stack system according to claim 1, wherein the water-gas separation integrated module comprises a water-gas separation box, a drain valve, and an exhaust valve (3), characterized in that: The water-gas separator includes a primary water-gas separator and a secondary water-gas separator (4). The primary water-gas separator includes a primary water-gas separator stack A (2) and a primary water-gas separator stack B (6). The drain valve includes a primary drain valve (5) and a secondary drain valve (8). The primary drain valve (5) is connected to the primary water-gas separator, and the secondary drain valve (8) is connected to the secondary water-gas separator (4). The exhaust valve (3) is connected to the water-gas separator.

3. A dual-stack system according to claim 2, characterized in that: The first-stage water-gas separator and the second-stage water-gas separator (4) are equipped with baffles at the mixed gas inlet, and a vortex device is provided at the lower end of the baffles.

4. A dual-stack system according to claim 2, characterized in that: A pressure sensor (1) is installed on the upper end of the exhaust valve (3).

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