A system for generating water recycling and humidification

Abstract

The present invention discloses a system for generating water recycling and humidification, which has the following circulation paths: Cooling water circuit circulation: The fuel cell stack flows through a temperature sensor and a pressure sensor and enters the coolant water pump, then flows into the evaporator, passes through the evaporator and enters the radiator, and then reaches the flow control valve and is divided into two paths. One path flows through the pressure sensor and the temperature sensor and enters the fuel cell stack, and the other path enters the intercooler and then converges to the cooling pipeline at the outlet of the fuel cell stack. Air circuit circulation: Air flows through the air filter and the mass flow meter and enters the condenser, then enters the turboexpander. The pressurized dry air flows through the temperature sensor and reaches the mixing chamber, where it is mixed with the water vapor generated by the evaporator and then flows through the humidity sensor, the pressure sensor and the temperature sensor and enters the fuel cell stack. The condenser receives the generated products of the fuel cell stack, then the condensed water enters the water pump, and the other gas products enter the turboexpander and then flow through the exhaust mixing chamber and are discharged.

Description

Technical Field

[0001] The present invention relates to the technical field of recycling of water generated by fuel cells, and particularly to a system for recycling and humidifying the generated water. Background Art

[0002] A proton exchange membrane fuel cell, also known as a fuel cell, is considered a future new energy power system due to its advantages such as high energy utilization efficiency, no noise, and fast power response. In a fuel cell system, hydrogen and air are used as the reaction gases at the anode and cathode to generate electric energy through an electrochemical reaction. In the application of the fuel cell system, the main generated product, pure water, is discharged without being recycled, and the humidity of the air after supercharging and intercooling is relatively low, which affects the comprehensive performance of the fuel cell. With the development of fuel cell technology, the demand for recycling and humidifying the generated product is becoming more prominent. How to achieve the recycling of the generated water has become a difficult problem that needs to be solved urgently.

[0003] In the prior art, during the process of adjusting the air humidity of a fuel cell, generally, an air circulation humidification circuit is used to effectively humidify the incoming stack air. It mainly relies on the liquid water and water vapor in the tail exhaust air for humidification. However, the humidification effect and operating conditions are limited, the humidification efficiency is not high, and the humidified gas and water are finally discharged without being reasonably utilized. It is neither applied to the effective humidification of air nor to the spray cooling of the radiator. There is an urgent need for a system and method to improve the efficiency and recycle the generated product. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention discloses a system for recycling and humidifying the generated water, comprising:

[0005] An air filter for receiving fresh air, the output end of the air filter is connected to a mass flow meter, the output end of the mass flow meter is connected to a condenser, the condenser receives the products output by the fuel cell stack and exchanges heat with air to form liquid water, the condenser conveys the output liquid water to a circulation water pump, and conveys the remaining gas to an air booster expander for boosting treatment, the output end of the air booster expander is connected to an intercooler, the output end of the circulation water pump is respectively connected to a spraying device and an evaporator through a three-way flow control valve I, wherein dry air flows through the intercooler and enters a mixing chamber to be humidified with the water vapor output by the evaporator to form the final gas entering the stack and is input to the mixing chamber, the output end of the mixing chamber is connected to the fuel cell stack, the coolant output by the fuel cell stack is conveyed to a water pump II, the water pump II is connected to the evaporator, the condensed water output by the evaporator is conveyed to the spraying device, the spraying device sprays water mist on a radiator, the output end of the radiator forms two paths of coolant through a three-way flow control valve II, one path flows through the intercooler for cooling the boosted air, and the other path directly enters the fuel cell stack and cools the fuel cell stack.

[0006] The output ends of the air booster expander and the mixing chamber are connected to an exhaust mixing chamber, so as to discharge other generated products through the exhaust mixing chamber.

[0007] The condenser exchanges heat with air for the water vapor and water generated by the fuel cell stack to generate condensed water.

[0008] By adjusting the flow rate of the water pump II to control the flow rate of the high-temperature coolant of the evaporator, so as to control the amount of generated water vapor and finally control the air humidity entering the fuel cell stack.

[0009] By adjusting the condensed water flow rate of the circulation water pump to control the amount of condensed water entering the evaporator, so as to control the amount of generated water vapor, and further control the air humidity entering the fuel cell stack.

[0010] The circulation water pump conveys condensed water into the evaporator, and exchanges heat with the high-temperature coolant output by the fuel cell stack to evaporate part of the condensed water to generate water vapor.

[0011] The spraying device sprays the condensed water generated by the condenser and the remaining condensed water of the evaporator onto the outside of the radiator for cooling.

[0012] Due to the adoption of the above technical solution, a system for generating water recycling and humidification provided by the present invention. The control system recycles the stack products into the humidification of the incoming air and the cooling of the radiator through the combined application of a condenser, an evaporator, a water pump and a spraying device. At the same time, the temperature and humidity of the incoming air can be adjusted to meet the system target requirements through the combined control of a circulating water pump, a second water pump, a three-way flow control valve and an air boosting expander. And the system generates water recycling to accurately control the air humidification effect, and the generated water recycling is used for external spraying cooling of the radiator. This system solves the problem of the recycling of the water generated by the stack at present, effectively recovers the stack products and controls the state of the incoming air through multiple variables to meet the target requirements of the dynamic working conditions of the stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 It is a structural block diagram of the system of the present invention

[0015] Figure 2 It is a working principle diagram of the system of the present invention DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To make the technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention:

[0017] As Figure 1A system for generating water recycling and humidification is shown. Fresh air flows through an air filter 1 and a mass flow meter 2 and enters a condenser 3. At the same time, the product generated by the fuel cell stack 24 flows through the condenser 3 to exchange heat with the air to form liquid water, and then flows through a first circulation water pump 7 to transport the condensed water to a three-way flow control valve 12 and is divided into two paths. One path is diverted to a spraying device 10 for external spraying and cooling of a radiator 11. The other path flows through an evaporator 9 to exchange heat with the high-temperature coolant at the outlet of the fuel cell stack to form a mixture of a large amount of water vapor and water, and this mixture enters a mixing chamber 6. The dry air flowing through the condenser for heat exchange enters an air booster expander 4 for boosting, and then flows through an intercooler 5 and enters the mixing chamber to mix with the mixture from the evaporator to achieve a humidifying effect and form the final gas entering the stack. The condensed water generated by the evaporator is used for external spraying and cooling of the radiator 11 through the spraying device 10. The excess condensed water in the mixing chamber 6 is drained into an exhaust mixing chamber 25. The coolant flowing out of the fuel cell stack flows through a second water pump 8, then flows through the evaporator 9, exchanges heat with the generated condensed water and enters the radiator 11, and then flows through a three-way flow control valve 13 to form two paths of coolant. One path flows through a pressure sensor 20 and a temperature sensor 21 to enter the fuel cell stack 24, and the other path directly enters the fuel cell stack to achieve a cooling function.

[0018] As Figure 2 shown: The system for generating water recycling and humidification disclosed by the present invention has the following circulation paths:

[0019] Cooling water circuit circulation: The fuel cell stack 24 flows through a temperature sensor 22 and a pressure sensor 23 and enters a coolant water pump, then flows into the evaporator 9, passes through the evaporator 9 and enters the radiator 11, and then reaches a flow control valve 13 and is divided into two paths. One path flows through a pressure sensor 20 and a temperature sensor 21 to enter the fuel cell stack 24, and the other path enters the intercooler 5 and then converges to the cooling pipeline at the outlet of the fuel cell stack.

[0020] Air circuit circulation: Air flows through an air filter 1, a mass flow meter 2 and enters the condenser 3, then enters the booster expander 4. The boosted dry air flows through a temperature sensor 14 to reach the mixing chamber 6, mixes with the water vapor generated by the evaporator 9, and then flows through a humidity sensor 15, a pressure sensor 16 and a temperature sensor 17 to enter the fuel cell stack 24. The condenser 3 receives the product generated by the fuel cell stack 24, then the condensed water enters the water pump 7, and other gas products enter the booster expander 4, and then flow through the exhaust mixing chamber 25 and are discharged.

[0021] On the pipeline for transporting the coolant of the fuel cell stack 24 in this system, a plurality of pressure sensors 16, 19, 20, 23, temperature sensors 14, 17, 18, 21, 22 and a humidity sensor 15 are provided to detect the pressure, temperature and humidity information of the pipeline, and combined with the combined control of a first control valve 12, a second control valve 13 and an air booster expander 4 to meet the requirements of the system for the air temperature and humidity.

[0022] Furthermore, the amount of generated water vapor can be controlled by adjusting the flow rate of the second water pump 8 (water pump control strategy), that is, the flow rate of the high-temperature coolant entering the evaporator 9, and further control the air humidity entering the fuel cell stack 24.

[0023] The amount of generated water vapor can be controlled by adjusting the condensate flow rate of the circulation water pump 7, that is, the amount of condensate entering the evaporator 9, and further control the air humidity entering the fuel cell stack 24.

[0024] The products generated by the fuel cell stack 24 (water vapor and water) can be heat-exchanged by air through the condenser 3 to generate condensate.

[0025] The condensate can be transported to the evaporator 9 by the circulation water pump 7, and part of the condensate is heat-exchanged and evaporated by the high-temperature coolant coming out of the fuel cell stack 24 to generate water vapor.

[0026] The excess condensate in the evaporator 9 and the condenser 3 can be used for spraying and cooling the radiator through the atomizing nozzle.

[0027] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A system for generating water recycling and humidification, characterized in that Comprising: An air filter (1) for receiving fresh air, the output end of the air filter (1) is connected to a mass flow meter (2), the output end of the mass flow meter (2) is connected to a condenser (3), the condenser (3) receives the products output by the fuel cell stack (24) and exchanges heat with air to form liquid water, the condenser (3) transports the output liquid water to a circulation water pump (7), and transports the remaining gas to an air booster expander (4) for pressurization treatment. The output end of the air booster expander (4) is connected to an intercooler (5). The output end of the circulation water pump (7) is respectively connected to a spray device (10) and an evaporator (9) through a three-way flow control valve one (12). Among them, dry air flows through the intercooler (5) and enters the mixing chamber to be humidified with the water vapor output by the evaporator (9) to form the final gas entering the stack and is input to the mixing chamber (6). The output end of the mixing chamber (6) is connected to the fuel cell stack (24). The coolant output by the fuel cell stack (24) is transported to a water pump two (8), the water pump two (8) is connected to the evaporator (9), the condensed water output by the evaporator (9) is transported to the spray device (10), and the spray device (10) sprays water mist on the radiator (11). The output end of the radiator (11) forms two paths of coolant through a three-way flow control valve two (13). One path flows through the intercooler (5) for cooling and temperature reduction of the pressurized air, and the other path directly enters the fuel cell stack (24) to cool the fuel cell stack.

2. The system for generating water recycling and humidification according to claim 1, characterized in that: The output ends of the air booster expander (4) and the mixing chamber (6) are connected to an exhaust mixing chamber (25), so as to discharge other generated products through the exhaust mixing chamber (25).

3. A system for generating water recycling and humidification according to claim 1, characterized in that: The condenser (3) exchanges heat between the water vapor and water generated by the fuel cell stack (24) with air to generate condensed water.

4. A system for generating water recycling and humidification according to claim 1, characterized in that: By adjusting the flow rate of the water pump two (8), the flow rate of the high-temperature coolant of the evaporator (9) is controlled, so as to control the amount of generated water vapor to adjust the air humidity entering the fuel cell stack (24).

5. A system for generating water recycling and humidification according to claim 1, characterized in that: By adjusting the condensed water flow rate of the circulation water pump (7), the amount of condensed water entering the evaporator (9) is controlled to control the amount of generated water vapor, and further control the air humidity entering the fuel cell stack (24).

6. A system for generating water recycling and humidification according to claim 2, characterized in that: The circulation water pump (7) transports the condensed water into the evaporator (9), and exchanges heat with the high-temperature coolant output by the fuel cell stack (24) to evaporate part of the condensed water to generate water vapor.

7. A system for generating water recycling and humidification according to claim 1, characterized in that: The spray device (10) sprays the condensed water generated by the condenser (3) and the remaining condensed water of the evaporator (9) outside the radiator (11) for cooling and temperature reduction.

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