Search

CN-224217477-U - Fuel cell system

CN224217477UCN 224217477 UCN224217477 UCN 224217477UCN-224217477-U

Abstract

The utility model relates to the technical field of fuel cells, in particular to a fuel cell system which comprises a humidifier, a back pressure valve, a flow dividing module, an air inlet system, a pile, an expander and a tail row, wherein the expander is communicated with the tail row, a dry air inlet port of the humidifier is communicated with an air outlet end of the air inlet system, the humidifier is communicated with the pile, an air inlet end of the back pressure valve is communicated with an air outlet port of the humidifier, the flow dividing module is provided with two groups of passages respectively communicated with the back pressure valve and the expander, one group of passages is used for being opened when the fuel cell system is smaller than or equal to a set drainage power state, and the other group of passages is used for being opened when the fuel cell system is larger than the set drainage power state. The utility model can reasonably distribute the flow direction of the cathode exhaust gas of the electric pile by controlling the opening and closing states of the two groups of passages of the flow dividing module, thereby improving the utilization rate of the whole energy and guaranteeing the reliability of the expander.

Inventors

  • YUAN KAI
  • CHAO PENGXIANG

Assignees

  • 德创未来汽车科技有限公司

Dates

Publication Date
20260508
Application Date
20250423

Claims (5)

  1. 1. A fuel cell system comprises an air inlet system, a pile, an expander and a tail row, wherein the expander is communicated with the tail row, and is characterized by further comprising The dry air inlet port of the humidifier is communicated with the air outlet end of the air inlet system, and the humidifier is communicated with the electric pile; The air inlet end of the back pressure valve is communicated with the air outlet port of the humidifier; The split flow module is provided with two groups of passages respectively communicated with the back pressure valve and the expansion machine, wherein one group of passages are used for being opened in a state that the fuel cell system is smaller than or equal to a set drainage power state, and the other group of passages are used for being opened in a state that the fuel cell system is larger than the set drainage power state.
  2. 2. The fuel cell system according to claim 1, wherein the one set of passages includes a switching valve A provided on the pipe, an inlet end of the switching valve A communicates with an outlet end of the back pressure valve, and an outlet end of the switching valve A communicates with an inlet end of the expander.
  3. 3. A fuel cell system according to claim 2, wherein the other group of passages includes an on-off valve B provided on the piping and a separation device for gas-water separation; the back pressure valve, the switch valve B, the separating device and the expander are communicated in sequence.
  4. 4. A fuel cell system according to claim 3, wherein the liquid outlet end of the separator communicates with the tail stock.
  5. 5. A fuel cell system according to claim 3, further comprising a three-way valve, wherein the outlet end of the back pressure valve communicates with the inlet end of the on-off valve A and the inlet end of the on-off valve B, respectively, via the three-way valve.

Description

Fuel cell system Technical Field The utility model relates to the technical field of fuel cells, in particular to a fuel cell system. Background There is an increasing demand for high power fuel cell systems in the market today, but the problem of BOP power consumption is also plagued by system integrators. The maximum power consumption source of the BOP is an air compressor, in order to reduce parasitic power consumption of the air compressor, a system integrator selects an expander such as a turbine expander (an air compressor with energy recovery) to recover waste gas discharged from a cathode outlet of a pile for energy recovery, so that the overall power consumption of the air compressor is reduced, but because the possible water amount in the gas discharged from the pile is large, the turbine and an overall shaft system are impacted, and the overall reliability is negatively affected for a long time. In order to avoid the hidden trouble, some system manufacturers add a cathode water separator device at the position from the outlet of the air path stack to the inlet of the turbine to reduce liquid water entering the turbine, so that the expander can be better protected. However, the cathode water separator is additionally arranged at the position from the cathode outlet of the system pile to the turbine inlet, so that the overall volume and flow resistance of the system are increased, the expansion ratio is reduced, the recovery effect is further affected, and the overall power consumption of the air compressor cannot be reduced to the greatest extent. Although the cathode gas-water separator is additionally arranged, the impact of water vapor on the air compressor is reduced, the overall performance of the system is influenced, the turbine acting is reduced, the overall net output power of the system is reduced, and the economical efficiency is also reduced. Disclosure of utility model The utility model aims to solve the problems in the background art and provides a fuel cell system. The technical scheme of the utility model is that the fuel cell system comprises an air inlet system, a galvanic pile, an expander and a tail row, wherein the expander is communicated with the tail row, and the fuel cell system further comprises The dry air inlet port of the humidifier is communicated with the air outlet end of the air inlet system, and the humidifier is communicated with the electric pile; The air inlet end of the back pressure valve is communicated with the air outlet port of the humidifier; The split flow module is provided with two groups of passages respectively communicated with the back pressure valve and the expansion machine, wherein one group of passages are used for being opened in a state that the fuel cell system is smaller than or equal to a set drainage power state, and the other group of passages are used for being opened in a state that the fuel cell system is larger than the set drainage power state. Preferably, the group of passages comprises a switch valve A arranged on the pipeline, wherein the inlet end of the switch valve A is communicated with the outlet end of the back pressure valve, and the outlet end of the switch valve A is communicated with the inlet end of the expander. Preferably, the other group of passages comprises an on-off valve B arranged on the pipeline and a separation device for gas-water separation; the back pressure valve, the switch valve B, the separating device and the expander are communicated in sequence. Preferably, the liquid outlet end of the separation device is communicated with the tail row. Preferably, the back pressure valve also comprises a three-way valve, and the air outlet end of the back pressure valve is respectively communicated with the air inlet end of the switch valve A and the air inlet end of the switch valve B through the three-way valve. Compared with the prior art, the technical scheme provided by the utility model has the following beneficial technical effects: According to the utility model, through controlling the opening and closing states of the two groups of passages of the shunt module, the flow direction of the cathode exhaust gas of the electric pile can be reasonably distributed, the utilization rate of the whole energy can be improved, and the reliability of the expander can be ensured; The switching parameters of the shunt module can be automatically adjusted according to the client requirements and the actual working conditions, the energy recovery mode can be automatically adjusted according to the client requirements and the actual working conditions, the moisture crossing the cathode can be directly selected, and the gas discharged from the cathode outlet of the electric pile can be completely subjected to gas-water separation and then enter the vortex end of the expander to do work. Drawings Fig. 1 is a flow chart of an embodiment of the present utility model. Detailed Description As shown in fig. 1, the fuel cell syst